Fabrication of functionalized two dimensional graphene oxide and promoted with phosphotungstic acid for reduction of organic dyes in water

Publication date: Available online 21 July 2019Source: Materials Chemistry and PhysicsAuthor(s): Mohaddesesh Shahabi Nejad, Neda Seyedi, Hassan SheibaniAbstractIn this research, a novel approach has been investigated for the fabrication of functionalized two-dimensional graphene oxide and promoted with phosphotungstic acid. First, PVP units with medium molecular weight were placed between graphene sheets for preparation of two-dimensional graphene oxide and then the surface of 2D-graphene oxide modified with (3-chloropropyl)triethoxysilane and metformin respectively. Finally, prepared support prompted with phosphotungstic acid which has the role of the active sites. This catalyst was characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and Fourier transforms infrared spectroscopy (FT-IR). 2D-GO-CPTES-Met/H3PW12O40 have been used for the catalytic reduction of methyl orange (MO) and methylene blue (MB) in the presence of NaBH4 as a reducing reagent. The progress of the reaction was monitor by UV–Vis spectrophotometry at different times. The obtained kinetic data for the reduction of MO and MB were fitted to first-order rate equations and the calculated rate constants for the reduction of MO and MB were as follows 0.020 and 0.102 s−1, respectively. The catalytic activity over 2D-GO-CPTES-Met/H3PW12O40 recycled catalyst remained at a satisfactory state after at least 10 runs.Graphical abstract
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research

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Publication date: Available online 22 August 2019Source: Journal of Pharmaceutical and Biomedical AnalysisAuthor(s): Inga Gabriunaite, Aušra Valiūnienė, Margarita Poderyte, Arunas RamanaviciusAbstractRecently, self-assembled monolayers (SAMs) are gaining a lot of interest due to their simplicity of preparation and wide applicability in the development of model systems used in pharmaceutical and biomedical analysis. The most efficient methods used for the investigation of SAM-based structures usually include cyclic voltammetry and electrochemical impedance spectroscopy. Scanning electrochemical microscopy (SECM) co...
Source: Journal of Pharmaceutical and Biomedical Analysis - Category: Drugs & Pharmacology Source Type: research
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Publication date: Available online 22 August 2019Source: Materials Today: ProceedingsAuthor(s): Y. Naciri, A. Bouddouch, B. Bakiz, A. Taoufyq, M. Ezahri, A. BenlhachemiAbstractIn this work, (1−x) Zn3(PO4)2/x BiPO4 (0 ≤ x ≤ 1) composites were synthesized by coprecipitation method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy SEM and energy dispersive X-ray spectrometry (EDS). The degradation of sulfadiazine by composites catalysts under UV irradiation was investigated. The photocatalytic results indicated that all the composites prepared exhibited higher ...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
Publication date: Available online 22 August 2019Source: Materials Today: ProceedingsAuthor(s): Abhijit Biswas, Suman Kalyan Das, Prasanta SahooAbstractThe current article attempts to study the effect of different heat treatment temperature on mechanical (hardness) and tribological behavior (friction and wear) of phosphorus enriched Ni-P (EN-P) and Ni-P-Cu coatings. Inclusion of Cu (∼16 wt%) into binary EN-P (∼12% wt. P) coating is commenced an affect to its properties. The coatings are deposited on low alloy steel and heat-treated them at 400 °C and 600 °C for constant time duration i.e. 1 h durati...
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Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
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Source: Materials Science in Semiconductor Processing - Category: Materials Science Source Type: research
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