Background and Objective: In order to investigate the photocatalytic activity of modified titanium dioxide nanoparticles in order to remove methyl orange contaminants, parameters such as the amount of contaminant concentration, the amount of photocatalytic, the pH of th More
Background and Objective: In order to investigate the photocatalytic activity of modified titanium dioxide nanoparticles in order to remove methyl orange contaminants, parameters such as the amount of contaminant concentration, the amount of photocatalytic, the pH of the solution and the calcination temperature were investigated.
Material and Methodology: In this study, Ag-Co / TiO2 nanoparticles were synthesized by sol-gel method and characterized by TEM, SEM, XRD and EDX techniques. The results of XRD diffraction studies showed that the simultaneous deposition of silver and cobalt had no effect on the crystalline pattern of titanium dioxide. The formation of Ag-Co / TiO2 nanoparticles and their approximate size were confirmed using the XRD spectrum and is about 270 nm. TEM images with a particle size of about 300 nm also confirm the XRD results. The morphology and purity of these synthesized nanoparticles were evaluated through SEM and EDX images. The results of EDX analysis showed that Ag-Co / TiO2 nanoparticles prepared by sol-gel method did not have a peak of impurity in the sample. The photocatalytic activity of Ag-Co / TiO2 nanoparticles under visible light irradiation was evaluated in the removal of methyl orange contaminants.
Findings: Co doped TiO2 nanoparticles by Ag and Co were shown to have highest activity as compared with the Ag/TiO2 , Co /TiO2 and pure TiO2 nanoparticles. The highest percentage of methyl orange removal by Ag-Co / TiO2 is 99.5% in 75 minutes.
Discussion and Conclusion: The optimum contents of silver and Cobalt for the preparation of co-doped Ag,Co/TiO2 nanoparticles were 0.9 and 0.3 at mol%, respectively
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Poly(acrylic acid-co-acrylamide) PAM-AA hydrogel by solution polymerization of acrylic acid (AA) and acrylamide (AM) using ammonium persulfate (APS) as initiator and N',N-methylenebisacrylamide ( MBA) was prepared as a binder. PAM-AA was used to adsorb methyl orange fro More
Poly(acrylic acid-co-acrylamide) PAM-AA hydrogel by solution polymerization of acrylic acid (AA) and acrylamide (AM) using ammonium persulfate (APS) as initiator and N',N-methylenebisacrylamide ( MBA) was prepared as a binder. PAM-AA was used to adsorb methyl orange from aqueous solutions. Factors affecting the absorption capacity such as absorption time, initial concentration of methyl orange, amount of superabsorbent hydrogel, pH value were investigated in detail and it was found that PAM-AA is very effective for removing methyl orange from its aqueous solutions. The equilibrium adsorption capacity was 359.89 mg/g at room temperature as initial. The concentration of methyl orange was equal to 3000 mg/liter. The mechanism of the adsorption process was also speculated. The study on the equilibrium adsorption isotherms showed that the adsorption was in accordance with the Langmuir and Freundlich model. Further investigation of the sorption kinetics showed that the sorption process was compatible with the pseudo-second order kinetic model.
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Preparation of effective nanocomposite energy materials using Earth-abundant elements and eco-friendly chemicals for application in photocatalytic degradation of hazardous materials and production of fuel is a sustainable strategy for pollutant removal and supplying hyd More
Preparation of effective nanocomposite energy materials using Earth-abundant elements and eco-friendly chemicals for application in photocatalytic degradation of hazardous materials and production of fuel is a sustainable strategy for pollutant removal and supplying hydrogen, the green/carbon-free fuel in modern world. In this article, the nanostructured magnesium ferrite (MgFe2O4) semiconductor was synthesized and employed for the production of hydrogen gas through the light-induced splitting of alkaline H2S solution and photocatalytic degradation of methyl orange–a refractory azo dye. Investigations revealed that the synthesized photocatalyst has the ability to destroy pollutant and produce hydrogen. To improve the photocatalyst activity, graphene oxide (GO) precursor was prepared through the modified Hummers method and utilized directly in the hydrothermal synthesis of MgFe2O4/rGO nanocomposite. The evidence showed that the presence of rGO (reduced graphene oxide) and the formation of nanocomposite can significantly increase the decolorization ability and hydrogen release in terms of enlarging the photocatalyst surface area, slowing down the electron-hole recombination, and enhancing photon absorption. The degradation efficiency was 84% [measured after one hour operation of the photoreactor] and the rate of hydrogen release was 5567 µmol/h [per gram of photocatalyst], indicated the good performance of the nanocomposite photocatalyst in pollutant removal and fuel production
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