Toxicity trends in E-Waste: A comparative analysis of metals in discarded mobile phones
Publication date: 15 December 2019Source: Journal of Hazardous Materials, Volume 380Author(s): Narendra Singh, Huabo Duan, Oladele A. Ogunseitan, Jinhui Li, Yuanyuan TangAbstractMobile phones and various electronic products contribute to the world’s fastest-growing category of hazardous waste with international repercussions. We investigated the trends in potential human health impacts and ecotoxicity of waste mobile phones through quantitative life cycle impact assessment (LCIA) methods and regulatory total threshold limit concentrations. A market-dominant sample of waste basic phones and smartphones manufactured be...
Source: Journal of Hazardous Materials - July 21, 2019 Category: Environmental Health Source Type: research

Modulation of secondary metabolite profiles by biologically synthesized MgO/perlite nanocomposites in Melissa officinalis plant organ cultures
Publication date: 15 December 2019Source: Journal of Hazardous Materials, Volume 380Author(s): Zahra Rezaei, Saeed Jafarirad, Morteza Kosari-NasabAbstractIn this work, biological synthesis of MgO/perlite nanocomposites (NCs) besides their effects on morphology and secondary metabolite profiles of Melissa officinalis plant organ cultures were evaluated. MgO NPs were immobilized on the surface of nanoperlite using M. officinalis extract as a capping agent. The as-synthesized MgO/perlite NCs were characterized by using FTIR, XRD, SEM, EDS and DLS. The average particle size of nanoperlite and MgO/perlite NCs was about 10 and 3...
Source: Journal of Hazardous Materials - July 21, 2019 Category: Environmental Health Source Type: research

Optimization for silver remediation from aqueous solution by novel bacterial isolates using response surface methodology: recovery and characterization of biogenic AgNPs
In this study, novel bacterial strains Enterobacter cloacae SMP1, Cupriavidus necator SMP2, and Bacillus megaterium SMP3 were isolated from silver mining site for the sake of silver remediation. Various experimental factors including temperature, pH and inoculum size (I_S) were optimized for silver remediation by SMP1 using central composite design (CCD) based on response surface methodology (RSM). For maximum 100% removal of silver the optimized values of temperature, pH and I_S were 23.5 °C, 7.5 and 2 % (v/v) respectively in less than 10 hrs of incubation. Simultaneously, silver nanoparticles (AgNPs) we...
Source: Journal of Hazardous Materials - July 19, 2019 Category: Environmental Health Source Type: research

Biochar accelerates the removal of tetracyclines and their intermediates by altering soil properties
Publication date: Available online 16 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Yan Yue, Congcong Shen, Yuan GeAbstractTetracyclines accumulation in soil environment potentially threatens agroecosystem safety. Interestingly, biochar could clean up organic pollutants, but to what extent biochar affects the removal of tetracyclines is unknown. To investigate it, five types of biochars derived from cow manure (CMB) and other four plant materials were respectively added into soils contaminated with a mixture of tetracycline, oxytetracycline, and chlortetracycline for 60-day incubation in the dark. Three parent ...
Source: Journal of Hazardous Materials - July 18, 2019 Category: Environmental Health Source Type: research

Novel insights into integrated fermentation and nitrogen removal by free nitrous acid (FNA) serving as treatment method
Publication date: Available online 16 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Fangzhai Zhang, Yongzhen Peng, Baikun Li, Zhong Wang, Hao Jiang, Qiong ZhangAbstractFree nitrous acid (FNA) has only been studied as the pretreatment of waste activated sludge (WAS). Integrated fermentation and nitrogen removal using FNA as a primary means of treatment are seldom investigated. WAS fermentation was characterized under various FNA concentration. The production of COD, protein, and carbohydrate increased with FNA concentration (in the range of 0.197-1.97 mg/L) before the denitrification process. Volatile fat...
Source: Journal of Hazardous Materials - July 18, 2019 Category: Environmental Health Source Type: research

Superhydrophobic and superaerophilic hierarchical Pt@MIL-101/PVDF composite for hydrogen water isotope exchange reactions
Publication date: Available online 16 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Xiaolong Fu, Jingwei Hou, Chao Chen, Jiamao Li, Lei Yue, Xiaojun Chen, Linjie Zhao, Guangming Ran, Xiulong Xia, Yu Gong, Wenjie Ding, Chengjian Xiao, Heyi WangAbstractA hierarchical porous composite of Pt@MIL-101/ployvinylidene fluoride (Pt@MIL-101/PVDF) was successfully prepared through a solution-processed method. This composite possesses advanced superhydrophobic and superaerophilic performance which makes it a promising catalyst facilitating liquid phase catalytic exchange techniques (LPCE) in hydrogen-water isotope exchange...
Source: Journal of Hazardous Materials - July 18, 2019 Category: Environmental Health Source Type: research

Manganese-based Multi-oxide derived from Spent Ternary Lithium-ions Batteries as High-Efficient Catalyst for VOCs Oxidation
Publication date: Available online 17 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Mingming Guo, Kan Li, Lizhong Liu, Hongbo Zhang, Weimin Guo, Xiaofang Hu, Xianglong Meng, Jinping Jia, Tonghua SunAbstractValuable metals such as manganese, cobalt, nickel and copper are recycled from spent ternary lithium-ions batteries (LiBs) and are considered as the active metal precursor to prepare based-manganese multi oxide for VOCs oxidation. The results of characterization analysis indicate that the catalyst from spent LiBs shows larger specific surface area of 26.80 m2/g as well as abundant mesoporous structures...
Source: Journal of Hazardous Materials - July 18, 2019 Category: Environmental Health Source Type: research

Synthesis of clay-cellulose biocomposite for the removal of toxic metal ions from aqueous medium
Publication date: Available online 15 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Emmanuel Abu-Danso, Sirpa Peräniemi, Tiina Leiviskä, TaeYoung Kim, Kumud Malika Tripathi, Amit BhatnagarAbstractClay-cellulose biocomposite (CCB) was synthesized in the present study. Spin and pressure-induced heating was applied to aggregate exfoliated clay tubules and cellulose using polyethylene glycol as an intermediate. The synthesized CCB was modified in the presence of NaOH at high temperature to obtain negative surface charge on the adsorbent. Physico-chemical properties of CCB were evaluated using different ch...
Source: Journal of Hazardous Materials - July 16, 2019 Category: Environmental Health Source Type: research

Brewers’ Spent Grain in Adsorption of Aqueous Congo Red and Malachite Green Dyes: Batch and Continuous Flow Systems
Publication date: Available online 15 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Harry Amuguni Chanzu, John Mmari Onyari, Paul Mwanza ShiunduAbstractSorption of Congo Red (CR) and Malachite Green (MG) dyes currently used in pigments and clothing industries were investigated using brewers’ spent grain (BSG) from a local brewery. Adsorption increased with a higher adsorbent weight and lower colorant concentrations. Accumulation of CR and MG was optimal at acidic pH and neutral pH respectively. Sorption decreased with an increase in temperature signifying an exothermic process. Batch adsorption data fitte...
Source: Journal of Hazardous Materials - July 16, 2019 Category: Environmental Health Source Type: research

Modelling of emerging contaminant removal during heterogeneous catalytic ozonation using chemical kinetic approaches
This study evaluated the prediction of emerging contaminant (EC) removal during heterogeneous catalytic ozonation by chemical kinetic models. Six ECs with differing ozone reactivity were spiked in a synthetic water and a groundwater, then treated by conventional ozonation and heterogeneous catalytic ozonation with α- or β-MnO2 catalysts. Results show that catalysts did not considerably influence the removal of ECs with high and intermediate ozone reactivity (diclofenac, gemfibrozil, and bezafibrate), but enhanced the removal efficiencies of ECs with low ozone reactivity (2,4-dichlorophenoxyacetic acid, clofibric...
Source: Journal of Hazardous Materials - July 16, 2019 Category: Environmental Health Source Type: research

Increased Power Production and Removal Efficiency of Polycyclic Aromatic Hydrocarbons by Plant Pumps in Sediment Microbial Electrochemical Systems: a Preliminary Study
In this study, we designed a new plant-driven SMES (New-PSMES) with a separated sand-filled anode column in order to improve the mass transfer and thereby enhance the microorganism activity, power generation and bioremediation range and efficiency for polycyclic aromatic hydrocarbons (PAHs). Because of the mass flow driven by the plants, the New-PSMESs started up approximately 7 d earlier and produced voltages 30-70 mV higher than the planted SMESs, and had greater enzyme activities and residual organic carbon than the unplanted and planted SMESs. In the New-PSMES, the total mass removal rates of phenanthrene and pyrene we...
Source: Journal of Hazardous Materials - July 16, 2019 Category: Environmental Health Source Type: research

Construction of magnetic nanoflower biocatalytic system with enhanced enzymatic performance by biomineralization and its application for bisphenol A removal
This study first reported a magnetic nanoflower biocatalyst of the core-shell magnetic composite microspheres with a hierarchical flower-like surface structure, which was consist of the organic component (horseradish peroxidase, HRP) and the inorganic component (Fe3O4@PMG-IDA-Cu2+) through self-assembly in the phosphate buffered saline (PBS) solution. The structure, pattern and crystallization of the magnetic nanoflowers were confirmed through a series of characterization. The optimized results of the magnetic nanoflowers formation conditions demonstrated that their hierarchical structure could effectively enhance the enzy...
Source: Journal of Hazardous Materials - July 16, 2019 Category: Environmental Health Source Type: research

The plastisphere in marine ecosystem hosts potential specific microbial degraders including Alcanivorax borkumensis as a key player for the low-density polyethylene degradation
Publication date: Available online 15 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Alice Delacuvellerie, Valentine Cyriaque, Sylvie Gobert, Samira Benali, Ruddy WattiezAbstractMost plastics are released to the environment in landfills and around 32% end up in the sea, inducing large ecological and health impacts. The plastics constitute a physical substrate and potential carbon source for microorganisms. The present study compares the structures of bacterial communities from floating plastics, sediment-associated plastics and sediments from the Mediterranean Sea. The 16S rRNA microbiome profiles of surface and...
Source: Journal of Hazardous Materials - July 16, 2019 Category: Environmental Health Source Type: research

Supported liquid membrane extraction of nickel using stable composite SPEEK/PVDF support impregnated with a sustainable liquid membrane
In conclusion, the SPEEK/PVDF impregnated with refined palm oil has improved the stability of SLM extraction of nickel ions from industrial wastewater. (Source: Journal of Hazardous Materials)
Source: Journal of Hazardous Materials - July 16, 2019 Category: Environmental Health Source Type: research

An overview of the challenges and trade-offs in closing the loop of post-consumer plastic waste (PCPW): Focus on recycling
We present an overview of how design, production, collection and sorting of PCPW present challenges for its recycling, which in turn result to a number of trade-offs. We explain that the evaluation of the multi-dimensional implications of trade-offs, arising from the PCPW recycling, is essential in measuring the long-term sustainability of such systems. This work scrutinises the sustainability of closing the plastic waste loops and sets a future research agenda.Graphical abstract (Source: Journal of Hazardous Materials)
Source: Journal of Hazardous Materials - July 16, 2019 Category: Environmental Health Source Type: research

A novel layer-by-layer heterogeneous cation exchange membrane for heavy metal ions removal from water
Publication date: Available online 15 July 2019Source: Journal of Hazardous MaterialsAuthor(s): S.M. Hosseini, H. Alibakhshi, E. Jashni, F. Parvizian, J.N. Shen, M. Taheri, M. Ebrahimi, N. RafieiAbstractA novel layer-by-layer (LbL) cation exchange membrane was prepared for heavy metal ions removal from water via electrodialysis. LBL membranes fabricated by coating of [chitosan-co-activated carbon nanoparticles] layer on polyvinyl chloride-based heterogeneous cation exchange membrane. Betterment in adherence of layers was achieved through glutaraldehyde cross linking. FTIR, FESEM, 3D-surface images and BET analysis were use...
Source: Journal of Hazardous Materials - July 15, 2019 Category: Environmental Health Source Type: research

Performance of Various Cyanide Degrading Bacteria on the Biodegradation of Free Cyanide in Water
This study reports on the biodegradation of free cyanide (FCN) by cyanide degrading bacteria (CDB) that were isolated from mining wastewater and thiocyanate containing wastewater. The performance of these isolates was compared to cryopreserved CDBs that were used in previous studies. The performance of the isolates to degrade FCN was studied in batch cultures. It was observed that the CDB from the thiocyanate wastewater showed higher biodegradation rates (2.114 g CN-. L-1.O.D600 nm-1. h-1) compared to the isolates from the mining wastewater. The isolates from the cryopreserved CDBs and from the mining ...
Source: Journal of Hazardous Materials - July 15, 2019 Category: Environmental Health Source Type: research

Radionuclide tolerance mechanism of plants for ultraselective enrichment of low content of thorium with exceptional selectivity coefficient
Publication date: Available online 13 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Wei Luo, Heng Xu, Yaping Wang, Xiaoxia Ye, Cheng Luo, Xuepin Liao, Xin Huang, Bi ShiAbstractSelective enriching low content of radionuclides from radioactive wastewater is a critical issue for environmentally benign utilization of nuclear power. Inspired by the tolerance mechanism of plants to radionuclides, we developed a pH-triggered ultraselective coordinative adsorption (CA) membrane. The as-prepared CA membrane featured the advantages of both coordinative adsorption and membrane separation, including ultrahigh selectivity c...
Source: Journal of Hazardous Materials - July 15, 2019 Category: Environmental Health Source Type: research

Classification of plastic waste originated from waste electric and electronic equipment based on the concentration of antimony
Publication date: Available online 13 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Ayah Alassali, Marco Abis, Silvia Fiore, Kerstin KuchtaAbstractThe aim of this research is a preliminary assessment of antimony concentration in plastic fractions deriving from different e-waste. We considered microwave ovens, desktop computers, laptops, mobile phones, a TV case, a PC monitor and LED lamps (63 items in total). The plastic fraction ranged from 8%-wt in computers and microwave ovens, up to 40%-wt in cell phones and 59%-wt in LED lamps. Specific polymers were identified through Near Infrared spectroscopy. The sampl...
Source: Journal of Hazardous Materials - July 15, 2019 Category: Environmental Health Source Type: research

A further inquiry into co-pyrolysis of straws with manures for heavy metal immobilization in manure-derived biochars
This study further investigated co-pyrolysis strategy on the levels, species and risks of metals (Cu, Zn, Cr, Ni, Pb, and Cd) carried by manure-based biochars through co-pyrolyzing swine manure (SM) and corn straw (CS) with different mixture ratios (1:0, 0:1, 3:1, 1:1, and 1:3, w/w) at 300 ℃, 500 ℃ and 700 ℃. The total heavy metals in SM biochars were significantly reduced by CS addition except when SM/CS ratio was 3:1 at 300 ℃. Notably, CS addition increased stable Ni, Zn, Cu, Pb and Cd, but simultaneously mobilized part of Ni, Zn, Cu and Pb in SM biochars, especially at higher CS ratio and higher temperature. Co-...
Source: Journal of Hazardous Materials - July 15, 2019 Category: Environmental Health Source Type: research

Synergies, radiation and kinetics in photo-Fenton process with UVA-LEDs
Publication date: Available online 13 July 2019Source: Journal of Hazardous MaterialsAuthor(s): N. López-Vinent, A. Cruz-Alcalde, L.E. Romero, M.E. Chávez, P. Marco, J. Giménez, S. EsplugasAbstractThe photo-Fenton process, with UV-A LED (λ = 380-390, 390-400 and 380-400 nm) has demonstrated to be effective in the abatement of a target micropollutant, such as diphenhydramine hydrochloride (DPH). Different concentrations of iron (Fe2+) and H2O2 were tested and monitored, and the best results in DPH removal were obtained for the highest concentrations of both iron (II) and H2O2...
Source: Journal of Hazardous Materials - July 15, 2019 Category: Environmental Health Source Type: research

Identification of hydroxyl and sulfate free radicals involved the reaction of 1,4-dioxane with peroxone activated persulfate oxidant
Publication date: Available online 13 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Michaela A. Cashman, Louis Kirschenbaum, Justin Holowachuk, Thomas B. BovingAbstractThis research investigates the formation of free radical intermediates in an advanced oxidation processes (AOP) capable of destroying recalcitrant contaminants. The AOP studied is marketed as OxyZone® and relies on the premise of successful persulfate activation by peroxone (hydrogen peroxide plus ozone) and the formation of free radicals. The goal of this research was to determine which radicals are involved in the treatment of the model con...
Source: Journal of Hazardous Materials - July 15, 2019 Category: Environmental Health Source Type: research

Removal and biotransformation pathway of antibiotic Sulfamethoxazole from municipal wastewater treatment by anaerobic membrane bioreactor
Publication date: Available online 13 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Chun-Hai Wei, Claudia Sanchez-Huerta, TorOve Leiknes, Gary Amy, Hong Zhou, Xiaodong Hu, Qian Fang, Hongwei RongAbstractA lab-scale mesophilic anaerobic membrane bioreactor (AnMBR) was used to treat synthetic municipal wastewater with variable concentrations of antibiotic Sulfamethoxazole (SMX) and bulk organics in this study. The removal and biotransformation pathway of SMX in the AnMBR were systematically investigated during a 170 d of operation under hydraulic retention time of 1 d. Average SMX removal was 97.1% under feed SMX...
Source: Journal of Hazardous Materials - July 15, 2019 Category: Environmental Health Source Type: research

Superior triethylamine detection at room temperature by {-112} faceted WO3 gas sensor
In this study, a novel hierarchical flower-like WO3 nanomaterial was synthesized using a microwave-assisted gas-liquid interface method. The morphology and exposed facets of WO3 nanomaterials can be manipulated through the control of the volume ratio between the water and ethylene glycol (EG) during the synthesis. Our results demonstrate that the samples prepared with water/EG ratio of 8:32 are mainly exposed {-112} facets, which have the best gas sensing response of 180.7 to 100 ppm TEA at room temperature (RT). Its superior gas sensing performance and stability are also evidenced by the short recovery speed of 72&...
Source: Journal of Hazardous Materials - July 13, 2019 Category: Environmental Health Source Type: research

Impacts on antibiotic-resistant bacteria and their horizontal gene transfer by graphene-based TiO2&Ag composite photocatalysts under solar irradiation
Publication date: Available online 12 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Mei-Ting Guo, Xiao-Bo TianAbstractIn recent years, photocatalysis has been considered as a promising method, which provides measures to environmental pollution. Antibiotic resistant bacteria (ARB) and their antibiotic resistance genes (ARGs), as the emerging environmental pollutants, are released into the environment, resulting in antibiotic resistance spread. TiO2-based nanocomposites, as the most common photocatalytic material, may influence ARB and ARGs under photocatalytic conditions. However, the research on this aspect is ...
Source: Journal of Hazardous Materials - July 13, 2019 Category: Environmental Health Source Type: research

Effective treatment and utilization of hazardous waste sulfuric acid generated from alkylation by lignocellulose ester-catalyzed oxidative degradation of organic pollutants
This study focused on effective utilization and treatment of the waste H2SO4 for simultaneous consumption of H2SO4 and deep oxidative degradation of the organics. The waste H2SO4 could completely react with magnesium oxide ore to prepare crude MgSO4 solution, and the organic pollutants in the solution were deeply degraded and mainly mineralized to H2O and CO2 with H2O2 as oxidant and sugarcane bagasse citrate (SBC), a kind of lignocellulose ester, as catalyst. The total amount of acidic groups of SBC significantly affected its catalytic activity, attributing to that these oxygen-containing functional groups adsorbed and im...
Source: Journal of Hazardous Materials - July 13, 2019 Category: Environmental Health Source Type: research

Construction of carbon-doped supramolecule-based g-C3N4/TiO2 composites for removal of diclofenac and carbamazepine: A comparative study of operating parameters, mechanisms, degradation pathways
Publication date: Available online 12 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Zhongzheng Hu, Xuewei Cai, Zirun Wang, Shan Li, Zhaowei Wang, Xiaoyun XieAbstractAn eco-friendly 2D heterojunction photocatalyst composites (BCCNT) consisting of carbon-doped supramolecule-based g-C3N4 (BCCN) layers and TiO2 nanoparticles has been fabricated via an in-situ method. Based on the SEM and XPS results affirmed that the coaction of doped carbon and supramolecule precursors lead to the different morphology of pure g-C3N4, C-doped g-C3N4 have improved the photodegradation diclofenac (DCF) and carbamazepine (CBZ). And th...
Source: Journal of Hazardous Materials - July 13, 2019 Category: Environmental Health Source Type: research

TiO2@C core@shell nanocomposites: a single precursor synthesis of photocatalyst for efficient solar water treatment
This study reports the facile synthesis of highly photoactive TiO2@C core@shell nanocomposites by using a single alkoxide precursor. TiO2 and carbon (C)-based hybrid nanomaterials are popular photocatalysts owing to their abundance, low toxicity and high stability. As such these materials are strong candidates for the development of practical solar water-treatment applications. However, synthesis of such nanomaterials is often a multi-step process and requires careful control of the external carbon source for producing the desired morphology. In this regard, the synthesis of well-dispersed TiO2@C nanocomposites is demonstr...
Source: Journal of Hazardous Materials - July 13, 2019 Category: Environmental Health Source Type: research

Isolation and characterization of a chlorate-reducing bacterium Ochrobactrum anthropi XM-1
Publication date: Available online 12 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Han-Wen Chen, Meng Xu, Xi-Wen Ma, Zhong-Hua Tong, Dong-Feng LiuAbstractA Gram-negative chlorate-reducing bacterial strain XM-1 was isolated. The 16S rRNA gene sequence identified the isolate as Ochrobactrum anthropi XM-1, which was the first strain of genus Ochrobactrum reported having the ability to reduce chlorate. The optimum growth temperature and pH for strain XM-1 to reduce chlorate was found to be 30 °C and 5.0-7.5, respectively, under anaerobic condition. Strain XM-1 could tolerate high chlorate concentration ...
Source: Journal of Hazardous Materials - July 13, 2019 Category: Environmental Health Source Type: research

Thermal hazards of benzoyl peroxide and its derived process products through theoretical thermodynamics assessment and different calorimetric technologies
Publication date: Available online 12 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Bin Laiwang, Shang-Hao Liu, Chi-Min ShuAbstractBenzoyl peroxide (BPO) is one of the primary OPs used as an initiator, curing agent, or medicine. Some of the plastic processes use BPO without air for maintaining the efficiency of the entire reaction. However, there have been numerous accidents involving BPO in petrochemical plants, especially those related to fire and explosion, that are due to its unstable thermal properties and peroxy bond (-O-O-). BPO can be identified as a typical substance with autocatalytic reaction charact...
Source: Journal of Hazardous Materials - July 13, 2019 Category: Environmental Health Source Type: research

Prenatal Exposure to Chlorinated Polyfluoroalkyl Ether Sulfonic Acids and Perfluoroalkyl Acids: Potential Role of Maternal Determinants and Associations with Birth Outcomes
This study investigated eleven PFASs by analyzing 98 cord samples from Hangzhou, China. All target compounds can be transported across placenta, with highest median concentrations of 4.07, 1.05 and 0.731 ng/mL for PFOS, PFOA, and 6:2 Cl-PFESA. Older ages and higher pre-pregnancy BMI were associated with higher cord PFASs concentration; being primiparous was also significantly associated. Notably, after adjusting for potential confounders, PFOS was negatively associated with birth weight (β = -417.3 g, 95 % CI: -742.1, -92.4, p = 0.011, per a log10 unit increase in exposure) and ponderal ind...
Source: Journal of Hazardous Materials - July 12, 2019 Category: Environmental Health Source Type: research

Antioxidant mechanisms to counteract TiO2-nanoparticles toxicity in wheat leaves and roots are organ dependent
Publication date: Available online 11 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Sónia Silva, José Miguel P. Ferreira de Oliveira, Maria Celeste Dias, Artur M.S. Silva, Conceição SantosAbstractNanoparticles (NP) bioactivity is under deep scrutiny. In this work, the antioxidant response to TiO2-NP in wheat (Triticum aestivum) was determined. For that, enzymatic and the non-enzymatic antioxidants were evaluated in plants exposed to the P25 anatase:rutile material composed of TiO2-NP and under environmentally realistic doses (0; 5; 50; 150 mg/L for 20 days). Shoot but not root...
Source: Journal of Hazardous Materials - July 12, 2019 Category: Environmental Health Source Type: research

Novel method of Square Wave Voltammetry for deposition of Bi2S3 thin film: Photocatalytic reduction of hexavalent Cr in single and binary mixtures
Publication date: Available online 11 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Mohammad Chahkandi, Mahboobeh ZargaziAbstractIn this work a new method of square‒wave voltammetry was performed for electrodepositing of Bi2S3 film on the stainless steel mesh surface as low-cost and effective substrate in visible light harvesting. First, the obtained porous film was characterized by X‒ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), atomic force microscopy (AFM), and Raman analysis. In following, photocatalytic activity ...
Source: Journal of Hazardous Materials - July 12, 2019 Category: Environmental Health Source Type: research

OMS-2-based catalysts with controllable hierarchical morphologies for highly efficient catalytic oxidation of formaldehyde
Publication date: Available online 11 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Jiafei Su, Cuilian Chen, Yaping Guo, He Xu, Qinfei KeAbstractCryptomelane-type octahedral molecular sieve (OMS-2) catalysts are currently attracting tremendous attention due to their low-cost and remarkable thermo-catalytic activity. However, it is still difficult for OMS-2 catalysts to completely degrade formaldehyde at relatively low or even ambient temperature. In this work, OMS-2 catalysts with different ratios of length to diameter were prepared and the OMS-2-s with the minim ratio of length to diameter (1-3) exhibited the ...
Source: Journal of Hazardous Materials - July 12, 2019 Category: Environmental Health Source Type: research

New Insights into the Synergistic Effect of Active Radicals and Adsorptive Ability on the Photodegradation of Gaseous Acetaldehyde over Reduced Graphene Oxide/P25 Composite
Publication date: Available online 10 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Qinglong Zeng, Xiaofeng Xie, Xiao Wang, Guanhong Lu, Haiwei Li, Shun Cheng Lee, Jing SunAbstractAlthough coupling reduced graphene oxide (RGO) with TiO2 is believed to enhance the photocatalysis through the light utilization, studies on its photothermal conversion effect are rarely reported. Herein, RGOP (reduced graphene oxide/P25) was synthesized to explore roles of the enhanced light adsorption and photothermal conversion in the photocatalytic process. It was found that although RGOP had increased absorbance, it actually poss...
Source: Journal of Hazardous Materials - July 12, 2019 Category: Environmental Health Source Type: research

One-pot route to synthesize HNTs@PVDF membrane for rapid and effective separation of emulsion-oil and dyes from waste water
Publication date: Available online 10 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Liang Zhou, Yi He, Heng Shi, Guoqing Xiao, Shunhui Wang, Zhenyu Li, Jingyu ChenAbstractWater-purification membranes with high water flux, excellent recycling ability, good anti-fouling property, wide range for different oil/water emulsions separation, and strong water-soluble dyes removal ability are highly desirable for water purification but still a challenge to be realized. In this work, we show a simple method to address this challenge, in which halloysite nanotubes (HNTs) have been decorated on the poly (vinylidene fluoride...
Source: Journal of Hazardous Materials - July 12, 2019 Category: Environmental Health Source Type: research

Sequestrating anionic and cationic dyes from wastewater using spray dried biopolymeric magnetic composite: Experimental and theoretical studies
Publication date: Available online 10 July 2019Source: Journal of Hazardous MaterialsAuthor(s): S.J. Olusegun, G.L.S. Rodrigues, E.T.F. Freitas, L.R.S. Lara, W.R. Rocha, N.D.S. MohallemAbstractSpray dried cross-linked chitosan/cobalt ferrite composite was synthesized and applied as an adsorbent for the removal of acid orange II and methylene blue. The composite was structurally, thermally, morphologically and magnetically characterized. The result obtained shows that the magnetic composite was in form of microspheres, while cobalt ferrite was encapsulated in the cross-linked chitosan with saturation magnetization of 10.79&...
Source: Journal of Hazardous Materials - July 12, 2019 Category: Environmental Health Source Type: research

A novel fatty alkene from marine bacteria: a thermo stable biosurfactant and its applications
In this study, a novel thermo stable biosurfactants, 1-Pentanonacontene (C95H190) a fatty alkene and 3-Hydroxy-16-methylheptadecanoic acid (C18H36O3) were isolated from a marine isolate SGD-AC-13. Biosurfactants were produced using 1% yeast extract in tap water as production medium at 24 h in flask and 12 h in bioreactor. Using 16S rRNA gene sequence (1515 bp) and BCL card (bioMérieux VITEK®), strain was identified as Bacillus sp. Crude biosurfactant reduced the surface tension of distilled water to 31.32 ± 0.926 mN/m with CMC value of 0.3 mg/ml. Cell free superna...
Source: Journal of Hazardous Materials - July 12, 2019 Category: Environmental Health Source Type: research

Effective Removal of Silica and Sulfide from Oil Sands Thermal In-Situ Produced Water by Electrocoagulation
Publication date: Available online 9 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Héline Chow, Anh Le-Tuan PhamAbstractEffective removal of silica and sulfide from oil sands thermal in-situ produced water can reduce corrosion and scaling of steam generators, enhancing water recycling and reuse in the industry. The removal of these two solutes as well as calcium and magnesium (i.e., the solutes that can also cause scaling) from synthetic and authentic produced waters by electrocoagulation (EC) was investigated in this study. In Fe0-EC, the precipitation of FeS minerals resulted in a rapid removal of sulf...
Source: Journal of Hazardous Materials - July 10, 2019 Category: Environmental Health Source Type: research

Effects of tetracycline on growth, oxidative stress response, and metabolite pattern of ryegrass
In this study, the growth and metabolites of ryegrass seedlings treated with tetracycline (0, 1, 10 or 100 mg/L) for 5 days were investigated. The results showed that the growth of ryegrass and the concentrations of carotenoid and chlorophyll decreased as the tetracycline concentration increased. Tetracycline increased the production of reactive oxygen species (ROS) and cell permeability and triggered mitochondrial membrane potential loss in the roots of ryegrass. The metabolic profiles of ryegrass differed between the control and tetracycline-treated groups. The contents of glucose, shikimic acid, aconitic acid, serine, l...
Source: Journal of Hazardous Materials - July 10, 2019 Category: Environmental Health Source Type: research

Characterization and 16S Metagenomic Analysis of Organophosphorus Flame Retardants Degrading Consortia
This study provides abundant microorganism sources for research on organophosphorus flame retardants (OPFRs) metabolism and bioremediation towards OPFRs-contaminated environments. (Source: Journal of Hazardous Materials)
Source: Journal of Hazardous Materials - July 10, 2019 Category: Environmental Health Source Type: research

Effects of Temperature on the Emission of Particulate Matter, Polycyclic Aromatic Hydrocarbons, and Polybrominated Diphenyl Ethers from the Thermal Treatment of Printed Wiring Boards
Publication date: Available online 8 July 2019Source: Journal of Hazardous MaterialsAuthor(s): ChuanYang Cai, LiYuan Chen, HuiJing Huang, Yang Liu, ShuangYu Yu, Yu Liu, Shu Tao, WenXin LiuAbstractThe effects of temperature on the emission of pollutants during the thermal treatment of electronic waste have rarely been investigated. The emission of particulate matter (PM), polycyclic aromatic hydrocarbons (PAHs), and polybrominated diphenyl ethers (PBDEs) from the thermal treatment of printed wiring boards was investigated over a temperature range of 320-600 °C. The emission factors (EFs) were determined to be wit...
Source: Journal of Hazardous Materials - July 9, 2019 Category: Environmental Health Source Type: research

Experimental and theoretical aspects of biochar-supported nanoscale zero-valent iron activating H2O2 for ciprofloxacin removal from aqueous solution
Publication date: Available online 8 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Qiming Mao, Yaoyu Zhou, Yuan Yang, Jiachao Zhang, Lifen Liang, Hailong Wang, Shuang Luo, Lin Luo, Paramsothy Jeyakumar, Yong Sik Ok, Muhammad RizwanAbstractCiprofloxacin has been frequently detected in water environment, and its removal has become a significant public concern. Biochar-supported nanoscale zero-valent iron (BC/nZVI) to activate hydrogen peroxide (H2O2) has many advantages on promoting the removal of organic contaminants. In this paper, the BC/nZVI activating H2O2 degradation of ciprofloxacin was systematically inve...
Source: Journal of Hazardous Materials - July 9, 2019 Category: Environmental Health Source Type: research

Dithiocarbamate-modified cellulose resins: A novel adsorbent for selective removal of arsenite from aqueous media
Publication date: Available online 6 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Keisuke Nakakubo, Hiroshi Hasegawa, Mikiya Ito, Kazuki Yamazaki, Maho Miyaguchi, Foni B. Biswas, Tomoyuki Ikai, Katsuhiro MaedaAbstractWe synthesized three new dithiocarbamate (DTC)-modified cellulose biomaterials (DMC-1, DMC-2, and DMC-4) to investigate their adsorption capabilities as mitigators of arsenite (AsIII) in aqueous media. The main novelty of the adsorbents was that, among two inorganic species of arsenic, arsenite and arsenate (AsV), DMCs were highly selective to AsIII in the pH range 2–7. The surface areas of ...
Source: Journal of Hazardous Materials - July 7, 2019 Category: Environmental Health Source Type: research

Boosted photocatalytic decomposition of nocuous organic gases over tricomposites of N-doped carbon quantum dots, ZnFe2O4, and BiOBr with different junctions
Publication date: Available online 6 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Seoung-Rae Kim, Wan-Kuen JoAbstractHerein, the effect of material structure on photocatalytic activity in the decomposition of nocuous organic gases (1,3,5-trimethylbenzene (TMB) and o-xylene (XYL)) was investigated by synthesizing tricomposite photocatalysts of N-doped carbon quantum dots, ZnFe2O4, and BiOBr (NCQDs/ZFO/BOB) with different junctions. The NCQDs/ZFO/BOB material (NCQDs/ZFO/BOB1) synthesized using a one-pot method revealed the highest photocatalytic efficiency. The NCQDs in NCQDs/ZFO/BOB1 exhibited photoluminescence...
Source: Journal of Hazardous Materials - July 7, 2019 Category: Environmental Health Source Type: research

Metoprolol and metoprolol acid degradation in UV/H2O2 treated wastewaters: An integrated screening approach for the identification of hazardous transformation products
This study describes the development of an integrated screening approach to determine the highest number of pharmaceutical transformation products (TPs) in a single run. The identification of TPs was based on the comparison of detected features with literature sources, compound prediction tools, in-house libraries and reference standards using high resolution mass spectrometry (HRMS). This integrated approach allowed a better estimation (in silico) of the ecotoxicological contribution of the individual TPs identified. As a proof of concept, this methodology was applied for identification of the TPs generated from metoprolo...
Source: Journal of Hazardous Materials - July 7, 2019 Category: Environmental Health Source Type: research

Shape-tunable CuO-Nd(OH)3 nanocomposites with excellent adsorption capacity in organic dye removal and regeneration of spent adsorbent to reduce secondary waste
Publication date: Available online 5 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Gautam Kumar Sarma, Aslam Khan, Ahmed Mohamed El-Toni, Md. Harunar RashidAbstractHerein, we report for the first time, the synthesis of CuO-Nd(OH)3 nanocomposites via a co-precipitation method coupled with the hydrothermal aging process. Varying the pH of the reaction medium, the shape of the nanocomposites could be controlled which determines their surface areas. These CuO-Nd(OH)3 nanocomposites exhibit very high adsorption capacity with successful removal of ˜ 97 % of brilliant blue G (BBG) from water in 180 min un...
Source: Journal of Hazardous Materials - July 6, 2019 Category: Environmental Health Source Type: research

Superhydrophobic and oleophobic ultra-fine dry chemical agent with higher chemical activity and longer fire-protection
Publication date: Available online 5 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Junchao Zhao, Zhitao Yin, Muhammad Usman Shahid, Haoran Xing, Xudong Cheng, Yangyang Fu, Song LuAbstractThe re-ignition of pool fires is a common hazard phenomenon in fire extinguishing. Dry chemicals with oleophobicity may solve this problem because powders can float on the oil surface and prevent evaporation of fuel pool. In this research, MAPP (modified ammonium polyphosphate) with superhydrophobicity, oleophobicity, and higher chemical activity is prepared which can quickly quench pool fires and provide longer protection. The...
Source: Journal of Hazardous Materials - July 6, 2019 Category: Environmental Health Source Type: research

The impact of wastewater matrix on the degradation of pharmaceutically active compounds by oxidation processes including ultraviolet radiation and sulfate radicals
Publication date: Available online 5 July 2019Source: Journal of Hazardous MaterialsAuthor(s): L. Sbardella, I. Velo Gala, J. Comas, I. Rodriguez-Roda Layret, A. Fenu, W. GernjakAbstractUltraviolet radiation (UV)-activated peroxydisulfate (PDS) and peroxymonosulfate (PMS) advanced oxidation processes were examined for their capacity to remove nine pharmaceutically active compounds (PhACs) from secondary effluent. The effect of operational parameters (initial oxidant concentration, UV exposure time, pH, common coexisting anions and effluent organic matter (EfOM)) on UV/PDS and UV/PMS treatment efficiency was investigated in...
Source: Journal of Hazardous Materials - July 6, 2019 Category: Environmental Health Source Type: research

Pilot Study of Specific Microbe Immobilization Cells (SMICs) Technology in Removing Tetramethyl Ammonium Hydroxide for Reuse of Low-Strength Electronics Wastewater
This study describes the specific microbe immobilization cell (SMIC) as an innovative technology for reuse of low-strength electronics wastewater. Pilot tests were performed to evaluate feasibility of this technology for removing slowly biodegradable organics including tetramethyl ammonium hydroxide (TMAH). SMIC pellets were prepared by entrapping concentrated culture of TMAH degrading bacteria inside media through polymerization. The operating conditions including hydraulic retention time, packing ratio of SMIC pellets, and recirculation ratio were optimized. The comparison data with conventional biological activated carb...
Source: Journal of Hazardous Materials - July 6, 2019 Category: Environmental Health Source Type: research