光催化法处理含Cr(VI)废水的研究

采用P 25 TiO2作为光催化剂,研究了废水的pH值、Cr(VI)的初始浓度、气氛及有机物等因素对含铬废水中Cr(VI)去解率的影响。结果表明,在pH值为3.0时,光催化反应速率最大;反应气氛对该体系中Cr(VI)的光催化还原无明显影响;苯酚、葡萄糖等有机物的存在能有效地促进Cr(VI)的光催化还原,当加入与Cr(VI)等物质的量的苯酚或葡萄糖时,150 mL反应液Cr(VI)浓度为0.96 mmol/L],0.15 g光催化剂,经12 W紫外灯照射反应120 m in,Cr(VI)完全被去除,相对于在反应体系中不加有机物时,Cr(VI)光催化还原效率提高了近100%;Cr(VI)的光催化还原符合L-H动力学规律。

Study on elimination of Cr(VI) in water by photocatalysis

Using P 25 TiO_2 as photocatalyst,the effects of pH value,various initial concentrations of(Cr(VI)),reaction atmosphere and organic chemicals on the removal rate of Cr(VI) have been investigated.The results indicated that the removal rate of Cr(VI) is the highest at pH = 3.0;the reaction atmosphere has negligible effect on photocatalytic redution of Cr(VI);phenol and glucose can improve greatly the photocatalytic reduction of Cr(VI),when the equivalent phenol or glucose was added into(Cr(VI))(aqueous) solution,the Cr(VI) in 150 mL wastewater(C_(Cr(VI))=0.96 mmol/L) were eliminated completely after 120 min illumination under pH=3.0 and 0.15 g of TiO_2,the photocatalytic removal rate of Cr(VI) increased nearly 100% in contrast to only Cr(VI) aqueous solution;the photocatalytic reduction of(Cr(VI)) follows L-H kinetic equation.