Application of Co3O4 nanoparticles as an efficient nano-sorbent for solid-phase extraction of zinc(II) ions

Publication date: Available online 15 October 2019Source: Microchemical JournalAuthor(s): Hossein Abdolmohammad-Zadeh, Zahra Ayazi, Safa HosseinzadehAbstractIn this research, a solid-phase extraction (SPE) method based on application of cobalt oxide nanoparticles (Co3O4 NPs) as a novel nano-sorbent was developed for preconcentration and extraction of zinc(II) ions from various real samples followed by flame atomic absorption spectrometric (FAAS) detection. Co3O4 NPs were simply synthesized via a thermal treatment of cobalt hydroxide after a precipitation method, and its structure and morphological properties were studied by Fourier transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. The effect of various parameters influencing the extraction recovery of Zn(II) ion such as extraction time, pH, amount of the nano-sorbent, sample volume and elution conditions were studied and optimized. Applying optimum conditions for SPE procedure, the limit of detection was 0.25 ng mL‒1 and the calibration graph was linear in the concentration range of 0.4‒32 ng mL‒1 with a correlation coefficient of 0.9951. The method intra- and inter-day precisions, calculated by performing five replicates at the concentration level of 20 ng mL‒1, were obtained 2.3% and 2.6%, respectively. The applicability of the developed SPE-FAAS method was evaluated by its application for measuring zinc concentration in various samples including tap water, river water, well water...
Source: Microchemical Journal - Category: Chemistry Source Type: research

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Abstract Treatment of pilon fractures remains challenging due to the difficulty of fracture reduction and associated soft tissue complications. The aim of this study was to evaluate the pitfalls and strategies of posterior column reduction in the treatment of complex tibial pilon fractures (AO/OTA 43-C3). Thirteen AO/OTA classification 43-C3 type pilon fractures treated between January 2013 and January 2016 were retrospectively analyzed. Nine cases were treated by external fixation within 26 hours (range, 6-56 hours) after injury. The definitive open reduction and internal fixation (ORIF) was performed after the w...
Source: Biomed Res - Category: Research Authors: Tags: Biomed Res Int Source Type: research
Publication date: Available online 13 November 2019Source: Saudi Pharmaceutical JournalAuthor(s): María Esperanza Adrover, Marisa Pedernera, Magali Bonne, Bénédicte Lebeau, Verónica Bucalá, Loreana GalloAbstractAlbendazole (ABZ, anti-parasitic active pharmaceutical ingredient) is a crystalline low water-soluble drug, thus the dissolution rate in gastrointestinal fluids is limited. Consequently, the improvement of the water solubility and dissolution rate of ABZ implies a great challenge for a more efficient treatment of hydatidosis. In this context, SBA-15 and SBA-16 ordered mesoporous si...
Source: Saudi Pharmaceutical Journal - Category: Drugs & Pharmacology Source Type: research
ConclusionsCeramic firing affected the marginal gap; however, all Co-Cr frameworks had a marginal gap lower than 120 μm, which is reported to be a clinically acceptable limit. Most of the specimens (80%) had a metal-ceramic bond strength value higher than the 25-MPa ISO 9693 requirement. Five of 28 dental laboratory technicians were not able to comply with ceramic firing instructions.
Source: The Journal of Prosthetic Dentistry - Category: Dentistry Source Type: research
Publication date: February 2020Source: Materials Science and Engineering: C, Volume 107Author(s): Fatma Öztürk Küp, Seval Çoşkunçay, Fatih DumanAbstractBiosynthesis of metal nanoparticles is expected as a cost efficient and ecofriendly option in the research study. Therefore, the aqueous extracts made from leaf of Aesculus hippocastanum (horse chestnut) were used as the reducing factors to synthesize silver nanoparticles (AgNPs) and their antioxidant, antibacterial and the application of resveratrol combined AgNPs as efficient delivery vehicles have also been evaluated. The biosynthesized AgNP...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
Publication date: Available online 12 November 2019Source: Materials Science and Engineering: AAuthor(s): A. Babutskyi, M. Mohin, A. Chrysanthou, Y. Xu, A. LewisAbstractThe effects of electropulsing on the fatigue resistance of aluminium alloy 2014-T6 were studied in relation to electric current amplitude, pulse duration, and number of repetitions. Utilising the Taguchi method, the present study identified the current amplitude and the duration of the electropulsing as the two critical treatment parameters for improved fatigue resistance. A 97% fatigue life improvement was achieved under the electropulsing conditions that ...
Source: Materials Science and Engineering: A - Category: Materials Science Source Type: research
Publication date: Available online 12 November 2019Source: Materials LettersAuthor(s): Li-Jun He, Jian-Chao Hao, Lin Dai, Rong-Chang Zeng, Shuo-Qi LiAbstractTo reduce the bacteria-associated infection for the Ti implant, an antibacterial coating composed of gentamicin (GS) and polyacrylic acid (PAA) was constructed using layer-by-layer (LbL) assembly technique. The surface morphology and chemical composition of the obtained multilayers were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The plate ...
Source: Materials Letters - Category: Materials Science Source Type: research
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Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
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Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
In this study, we selectively chlorinated ilmenite using a fluidized bed reactor to analyze the porous structure formed after processing the ilmenite ore. The removal rate of iron oxides in ilmenite increased with reaction time. When the experiment was performed for 40 min, approximately 96.5% of the iron oxides were removed. We analyzed samples subjected to the 40 min reaction to investigate the pore microstructure formed during chlorination. Surface observations using scanning electron microscopy revealed that the surface of the chlorinated ilmenite ore formed a porous structure, which differed from the dense surface...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
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Source: Journal of Materials Research and Technology - Category: Materials Science Source Type: research
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