中文摘要：

采用亚硫酸钠还原法制备了Cu2O光催化剂，并将其应用于含铬（Ⅵ）废水降解还原的光催化反应，同时与Bi2WO6、TiO2等光催化剂进行了活性比较。研究表明，在300W高压汞灯照射下反应1．5h，Cu2O、Bi2WO6和TiO2光催化剂对铬（Ⅵ）的光催化还原降解率分别为69．5％、61．5%和44．2％，与其禁带宽度（2．0eV、3．0eV、3．2eV）成反比，Cu2O较窄的禁带宽度使其具有良好的光催化活性。Cu2O光催化还原铬（Ⅵ）废水的适宜工艺条件为：废水的pH为3．0，Cu2O光催化剂用量为0．25g·L^-1。在上述工艺条件下，300W高压汞灯光照反应时间4h后，废水中的铬（Ⅵ）有82％被还原。采用微分法对Cu2O光催化还原含铬（Ⅵ）废水反应进行了化学动力学研究，其光催化反应速率方程为：v=0．681Ccr^2.7。

英文摘要：

The Cu2O powder catalyst prepared through the method of sodium sulfite reduction was applied to the photocatalytic reduction of Cr （Ⅵ） containing in wastewater. The catalytic activity of Cu2O was compared with that of Bi2WO6 and TiO2. The results show that under 300W high voltage mercury-vapor lamp irradiation for 1.5 h, the photoreduction ratios of Cr （Ⅵ） by Cu2O, Bi2WO6 and TiO2 are 69.5%, 61.5% and 44.2%, respectively, and they are in inverse proportion to their band gaps （2.0 eV, 3.0 eV and 3.2 eV）. Cu2O has narrower band gap and hence exhibits good catalytic activity. The suitable conditions for photocatalytic reduction of wastewater containing Cr （Ⅵ） by using Cu2O as catalyst were found as follows： pH value of 3.0 and Cu2O dosage of 0.25 g·L^-1. Using the irradiation of 300W high voltage mercury-vapor lamp for 4 h and under above reaction conditions, 82% Cr （Ⅵ） in the wastewater can be reduced. A differential method was used to investigate the reaction kinetics of degrading Cr （Ⅵ）-containing wastewater by using Cu2O as photocatalyst, and its photocatalytic reaction rate equation was obtained as follows： v = 0.681Cr^2.7.