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《Environmental Science》 2010-12
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Preparation of Mixed Crystal TiO_2 Nanoparticles and Photocatalytic Degradation of Toxic Organic Pollutants

DENG An-ping1,YANG Jing1,WANG Shu-lian1,HUANG Ying-ping1,YANG Yong2(1.Alan G.MacDiarmid Research Institute of Renewable Energy,Three Gorges University,Yichang 443002,China;2.Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)  
Mixed crystal TiO2 nanoparticles were prepared from a precursor of TiO2 by hydrothermal-steam method.The effects of the reaction temperature and the reaction time on the photocatalytic activity of the brookite TiO2 were studied.The TiO2 samples were characterized by X-ray diffraction(XRD) and transmission electron microscopy(TEM).Photocatalytic degradation of organic dye sulforhodamine B(SRB) under UV light(λ ≤387 nm) was used as probe reaction to evaluate the properties of the TiO2.The result showed that TiO2 prepared under 150℃ for 24 h had high photocatalytic activity.The size of the mixed crystal TiO2 was 14.20 nm.Brookite and anatase phase of the mixed crystal TiO2 were 63.6% and 36.4%,respectively.The dye discoloration and degradation rates were tracked,and the intermediate products hydrogen peroxide(H2 O2) and hydrogen radicals(.OH) were determined during the photocatalytic experiments.The results indicated that photocatalytic degradation of brookite TiO2 mainly referred to the.OH radical mechanism.After 5 h,the mineralization and oxidation rates of SRB and 2,4-DCP mineralization were 89% and 78%,respectively.The catalyst showed good stability with no significant changes in catalytic properties after 5 cycles of SRB photocatalytic degradation experiments.
【Fund】: 国家自然科学基金项目(20877048 50701018);; 国家重点基础研究发展规划(973)前期研究项目(2008CB417206);; 湖北省青年杰出人才基金项目(2005ABB030);; 教育部博士点基金新教师项目(20070251031)
【CateGory Index】: TB383.1;X50
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