Abstract: Using sodium dithionite as the reducing agent,the advanced reduction technique has been used for the degradation of Cr(Ⅵ) in water under the irradiation of ultraviolet light. The influencing factors are investigated,and the mechanisms of an advanced reduction technique discussed. Under the optimal conditions as below:the pH is 3, the concentration of the original water Cr(Ⅵ) 10 mg/L,and the dosage of reducing agent 0.1 g/L,the removing rate of Cr(Ⅵ) reaches 98.62%. The reduction process conforms to the second-order kinetics equation, and the advanced reduction technology speeds up the degradation rate greatly.

Key words: advanced reduction, sodium dithionite, hexavalent chromium

摘要： 以连二亚硫酸钠为还原剂，在紫外光照射下，用高级还原技术降解水中Cr（Ⅵ），研究反应影响因素及机理。在溶液pH为3、原水Cr（Ⅵ）为10 mg/L、还原剂投加量为0.1 g/L的最佳条件下，高级还原技术对Cr（Ⅵ）的去除率达到98.62%，反应过程符合二级动力学方程，高级还原技术大大加快了降解速率。

关键词: 高级还原, 连二亚硫酸钠, 六价铬

CLC Number: 

• X703