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Preparation、characterization and Activity Evaluation of Composite Photocatalyst

Author: YuXiaoLing
Tutor: ChenShiFu
School: Huaibei Normal
Course: Analytical Chemistry
Keywords: composite photocatalyst preparation characterization photoactivity evaluation photoreduction mechanism
CLC: O643.36
Type: Master's thesis
Year: 2010
Downloads: 110
Quote: 1
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Abstract


Abstract: Fe-TiO2 photocatalyst was prepared by sol-gel method using tetrabutyl titanate [Ti（OC4H9）4] as the titanium precursor. The composite photocatalyst Fe-TiO2/TiO2 were prepared by ball milling method. Orthorhombic Nb2WO8 was synthesized through solid reaction in Nb2O5-WO3 system. Stoichiometric amounts of Nb2O5 and WO3 were mixed and heated in alundum crucible at 1100 oC for several hours. Heterojunction photocatalyst Nb2WO8/ZnO was prepared via ball milling using aqueous solution as the dispersant. heterostructure In2O3/In（OH）3 photocatalyst was prepared by programmed thermal treatment of In（OH）3 using In（NO3）3.9H2O as the precursor. Various characterization methods such as X-ray power diffraction （XRD）, UV–Vis diffuse reflectance spectroscopy （DRS）, flourier transform infrared spectrometry （FT-IR） and transmission electron microscopy （TEM） were employed to investigate the structure, morphologies, and optical properties. The results show that doping Fe3+ into TiO2 is more beneficial towards photocatalytic reduction rather than oxidation with the optimum amount level 0.05% （Fe/Ti molar ratio）. After coupled between Fe-TiO2 and TiO2, both the photooxidation and photoreduction activities of the sample are enhanced. Amongst the composite Fe-TiO2/TiO2 samples, the Fe-TiO2 （5.0wt.%）/TiO2 sample exhibits the best photocatalytic activity; the photocatalytic activity of the Nb2WO8/ZnO was higher than that of ZnO. When the amount of doped Nb2WO8 was 10wt.% and the Nb2WO8/ZnO was ball milled for 9 h, the heterostructure Nb2WO8/ZnO show the optimal activity. When the composition of In（OH）3 is less than 5wt.%, the photocatalytic activity of the heterostructure In2O3/In（OH）3 is higher than single In2O3 and In（OH）3. CuCr2O4 photocatalyst was successfully synthesized both by solid reaction and facile citric acid method. The feasibility of photoreduction of nitro-benzene using CuCr2O4 as the photocatalyst under UV illumination was confirmed. Effects of parameters of preparation conditions on the photocatalytic activity were investigated. The mechanisms of influence on the photocatalytic activity were also tentatively discussed.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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