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RTB Photocatalytic Degradation for Neutral Red

XIA Jin-hong1,TANG Yu-sheng2,ZHANG Zhen-hua1,WANG Yang-he1(1.School of Electronic Engineering,Guilin University of Electronic Technology; 2.School of Material Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China)  
With bentonite as a carrier,4 n-butyl titanate and high cerium sulfate as raw material,sol-gel method was used for preparation of composites photocatalyst of rare earth-doped TiO2 bentonite(RTB),with structure and morphology characterizing by XRD and SEM.Results showed that it has a high specific surface area,and there exists an obvious TiO2 anatase crystalline characteristics peaks.Catalyst dosage,initial dye concentration,illumination time,pH value and other factors on decolorization rate of neutral red dye as well as its dynamic equations were studied.Experimental results showed that for 100 mg/L neutral red dye solution,under the conditions of catalyst dosage 0.5 g,illumination time 100 min and pH 4~7,the decolorization rate was more than 99%,with better decolorization effect under sunlight.Reuse of catalyst for 5 times has still very high photocatalytic activity,with the decolorization of neutral red more than 90%.Photocatalytic degradation of neutral red by RTB is consistent with the kinetic equation.
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