摘要
以TiO2薄膜为工作电极,铂网作为辅助电极,甘汞电极为参比电极,进行紫外光光电催化还原Cr(VI),探讨了溶液初始pH值、Cr(VI)初始浓度以及柠檬酸浓度对反应性能的影响。结果表明,在酸性条件下,TiO2对Cr6+离子污染具有显著的光电催化还原消除效果;随着Cr(VI)初始浓度的增加,其光电催化还原反应速率降低;柠檬酸作为空穴捕获剂可有效地捕获光生空穴,在一定浓度范围内,Cr(VI)的光电还原反应速率随柠檬酸浓度的增加而增加。在pH为3、0.6 V偏压、0.006 g柠檬酸条件下,初始浓度为10 mg/L的Cr(VI)反应210 min时,其转化率达到82.19%。
The ultraviolet photo catalytic reduction of Cr （Ⅵ） was studied, by using TiO2 films as working electrode, platinum net as auxiliary electrode, calomel electrode as the reference electrode, discusses The effect of the initial pH value of solution, initial concentration of Cr （Ⅵ） and citric acid concentration on reaction performance was investigated. The results showed that, TiO2 can eliminated the effect of reducing photoelectron catalytic significantly on Cr（Ⅵ） ion pollution under acidic condition. With the increase of initial Cr （Ⅵ） concentration, the photo catalytic reduction reaction rate decreased. As a hole scavenger citric acid could efficiently trap photogenerated holes. In a certain range of concentration, Cr （Ⅵ） photo reduction reaction rate increased with the concentration of citric acid. At pH 3, 0.6 V bias, 0.006 g citric acid conditions, the initial concentration of 10 mg/L Cr （Ⅵ） the reaction time was 210min, the conversion rate reached 82.19 %.
出处
《广东化工》
CAS
2014年第6期53-54,共2页
Guangdong Chemical Industry
