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Study on TiO_2 Photocatalysis Reduction of Cr(Ⅵ)

LU Xiu_guo, ZHAI Yong_qing, DING Shi_wen, ZHAO Wen_ge(Department of Chemistry, Hebei University, Baoding 071002, China)  
The waste water including Cr(Ⅵ) has been handled by photocatalyst-the powder of TiO2. The optimum photo reduction conditions are as follows: the acidity of the aqueous solution is 0.5 mol/L H2SO4, the mass concentration of Cr(Ⅵ) is 80 mg/L and its volume is 50 mL, the quantity of catalyst is 0.3 g, the time of photo radiation is 4.0 h, the photo reduction ratio of Cr(Ⅵ) is over 95.0%. At the same time, the mechanism of photocatalytic conversion of Cr(Ⅵ) has been preliminarily probed, and it is proved that TiO2 photo reduction of Cr(Ⅵ) follows the formula of one-order reaction rate:lnC=-0.88t+4.38.
【Fund】: 河北省教委博士基金资助项目
【CateGory Index】: X131.2
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