By a News Reporter-Staff News Editor at Science Letter -- Research findings on Chalcogens are discussed in a new report. According to news reporting originating from Duisburg, Germany, by NewsRx correspondents, research stated, "In this paper, Ag/ZnO photocatalysts with different Ag loadings were prepared by photo reduction, chemical reduction and polyacrylamide-gel methods. The Ag/ZnO photocatalysts were characterized by XRD, SEM, TEM, EDS and DRUV-vis methods."
Our news editors obtained a quote from the research from the University of Duisburg-Essen, "The results of the photocatalytic degradation of 4-NP in aqueous suspensions showed that silver ions doping greatly improved the photocatalytic efficiency of ZnO nanocrystallites. The enhancement of photocatalytic activity is due to the fact that the modification of ZnO with an appropriate amount of Ag can increase the separation efficiency of photogenerated electrons and holes in ZnO, and the improvement of photo stability of ZnO is attributed to a considerable decrease of the surface defect sites of ZnO after the Ag loading. The chemisorptions of molecular oxygen and the chemisorption of atomic oxygen on Ag in the Ag/ZnO photocatalysts were observed. It was found that the metallic Ag in the Ag/ZnO photocatalysts does play a new role of O-2 chemisorption sites except for electron acceptor, by which chemisorbed molecular oxygen reacts with photogenerated electrons to form active oxygen species, and thus facilitates the trapping of photogenerated electrons and further improves the photocatalytic activity of the Ag/ZnO photocatalysts. Also the method of preparation is regarded as important factors for determining photocatalysis."
According to the news editors, the research concluded: "The best photocatalytic performance was exhibited for Ag/ZnO prepared by polyacrylamide gel method in comparison with chemical reduction and photo reduction method and the optimum Ag content was approximately 0.5%."
For more information on this research see: Synthesis of Ag/ZnO nanostructures by different methods and investigation of their photocatalytic efficiency for 4-nitrophenol degradation. Applied Surface Science, 2013;284():80-86. Applied Surface Science can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Applied Surface Science - www.elsevier.com/wps/product/cws_home/505669)
The news editors report that additional information may be obtained by contacting B. Divband, University of Duisburg Essen, Fac Phys, Duisburg, Germany. Additional authors for this research include M. Khatamian, G.R.K. Eslamian and M. Darbandi (see also Chalcogens).
Keywords for this news article include: Europe, Germany, Duisburg, Chalcogens, Nitrophenols, Photocatalyst, Nanostructural, Nanostructures, Nanotechnology, Photocatalytic, Nitro Compounds, Emerging Technologies
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