Comparative Studies on Degradation of Methyl Orange by Nanostructured Zinc and Zinc Oxide Films |
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Authors: | Bing-jun Wu Chang-shan Hao Bin Xie Ming Li |
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Institution: | 1.USTC-SHINCRON Joint Laboratory, Hefei National Laboratory for Microscale Science of Physics,University of Science and Technology of China, Hefei 230026, China;Tianjin Key Laboratory of Optical Thin Film, Tianjin Jinhang Institute of Technology Physics,Tia2.USTC-SHINCRON Joint Laboratory, Hefei National Laboratory for Microscale Science of Physics,University of Science and Technology of China, Hefei 230026, China |
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Abstract: | Nanostructured zinc and zinc oxide films were prepared by magnetron sputtering processes and succeeded air annealing treatments. Comparison of reductive degradation rate of methyl orange (MO) by zinc films and photocatalytic degradation rate of MO by zinc oxide films was carried out. Both reductive degradation and photocatalytic degradation process of MO by zinc and zinc oxide films can be described by first order kinetic model. It was found that although MO liquid was most quickly decolorized by metallic zinc films, the mineraliza-tion of MO was not thorough. Observation of extra ultraviolet absorption peaks indicated the formation of aromatic intermediates. On the other hand, although the photocatalytic degradation rate of MO liquid by ZnO films was only as about 1/4 large as the reductive degradation rate by zinc films, no signs of aromatic intermediates were found. Moreover, it was found that partially oxidized zinc oxide film showed higher photocatalytic efficiency than the totally oxidized ZnO films. Synergy effect between zinc and zinc oxide phase in the partially oxidized films was considered to be responsible for the higher photocatalytic efficiency. |
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Keywords: | Methyl orange Zinc ZnOx ZnO Reductive degradation Photocatalysis |
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