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《Journal of Safety and Environment》 2012-03
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Preparation and characterization of Cu-Fe co-doped TiO_2/bentonite photocatalyst

ZHU Peng-fei,LIU Mei,ZHU Tian-ju,SONG Cheng(School of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)  
The paper is aimed at presenting our research results on the enhancement of photocatalytic activity of modified TiO2 photocatalyst under visible light and its regeneration capacity.First of all,Cu-Fe-TiO2/bentonite composite photocatalysts were prepared by sol-gel,liquid phase precipitation and mechanical mixing method,respectively.Next,by using the degradation of direct sky blue dye wastewater as a model,the photocatalytic properties of samples obtained through different preparation methods were investigated under visible and ultraviolet light.Finally,XRD and FTIR were employed to characterize the structure of the samples.The results show that the preparation methods have a significant influence on the photocatalytic performance of Cu-Fe-TiO2/bentonite catalysts and the catalyst prepared by sol-gel method shows highest photocatalytic activity.When the initial concentration of direct sky blue was 50 mg/L and illumination time was 1.5 h,the decolorization rate of direct sky blue solution under visible light irradiation(97.3%) was in close proximity to that of ultraviolet light(98.6%).This is mainly attributed to the higher degree of compositing of TiO2 particles with bentonite,and the Cu2+and Fe3+ions incorporate into the lattice structure of anatase TiO2 and partially replace Ti4+,Thus,the ternary compound semiconductor was formed.Besides,the results also show that the sol-gel method has enhanced the formation of lattice defects of TiO2 and produced a synergic effect between the Cu-Fe,TiO2 and bentonite.In the catalyst prepared by sol-gel method,the high surface area of bentonite which works well as an effective adsorbent,concentrates direct sky blue dye molecules around the loaded TiO2.The Cu2+and Fe3+ions which are used as dopants,after incorporated into the TiO2 lattice,can induce the formation of lattice defects then modify the band gap of TiO2.They act as charge separators of the photoinduced electron-hole pairs and thus enhance the photocatalytic activity under visible light.In addition,the performance of prepared catalyst is stable,easy to settle down and separate.It is reusable by subjecting to high temperature activation.Therefore,the catalyst has a potential application in water treatment technology.
【CateGory Index】: X703
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