Preparation of photocatalytic Fe2O3-TiO2 coatings in one step by metal organic chemical vapor deposition |
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Authors: | Xingwang Zhang |
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Institution: | Institute of Environmental Pollution Controlling Technologies, Xixi Campus, Zhejiang University, Hangzhou 310028, China |
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Abstract: | There are two major difficulties in the TiO2 liquid-solid photocatalytic system: effective immobilization of the TiO2 particles; and improving the catalytic activity under visible light. To simultaneously solve these two problems, Fe2O3-TiO2 coatings supported on activated carbon fiber (ACF), have been prepared in one step by a convenient and efficient method—metal organic chemical vapor deposition (MOCVD). XRD results revealed that Fe2O3-TiO2 coatings mainly composed of anatase TiO2, α-Fe2O3 phases and little Fe2Ti3O9. The pore structure of ACF was preserved well after loading with Fe2O3-TiO2 coatings. UV-vis diffuse reflectance spectra showed a slight shift to longer wavelengths and an enhancement of the absorption in the visible region for Fe2O3-TiO2 coatings, compared to the pure TiO2 sample. A moderate Fe2O3-TiO2 loading (13.7 wt%) was beneficial to mineralizing wastewater because the intermediates could be adsorbed onto the surface of photocatalyst following decomposition. The stable performance revealed that the Fe2O3-TiO2 coatings were strongly adhered to the ACF surface, and the as prepared catalysts could be reused showing potential application for wastewater treatment. |
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Keywords: | MOCVD TiO2 Fe2O3 Visible light Photocatalysis |
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