Bi_2WO_6可见光催化降解染料废水实验研究  

Photocatalysis of dye wastewater by Bi2WO6 under visible light

作　　者：徐缇[1] 陈建林[1] 王仪春[1] 郑寿荣[1] 杨英杰[1] 李娣[1] 

机构地区：[1]南京大学环境学院污染控制与资源化研究国家重点实验室,南京210093

出　　处：《环境科学学报》2007年第9期1439-1443,共5页Acta Scientiae Circumstantiae

摘　　要：采用水热法合成了新型的可见光催化剂Bi2WO6,以活性蓝M-2GE染料废水为目标污染物,研究了催化剂的用量、污染物初始浓度、溶液pH、盐效应等因素对光催化降解效果的影响.结果表明,在优化实验条件下(催化剂的投加量为3g·L-1、pH值中性偏酸性、反应90min),对目标污染物的去除率可达到99%;溶液中盐浓度的增加对降解有抑制作用;催化剂对不同初始浓度活性蓝M-2GE染料的去除过程遵循一级动力学方程;催化剂重复使用后催化效果有所下降,但仍然可以保持在90%左右.因此,用水热法合成的催化剂Bi2WO6具有良好的可见光活性.　A new type of visible light reactive photocatalyst, Bi2WO6,was prepared by hydrothermal synthesis,and the influence of catalyst dosage,M-2GE concentration,pH and salt concentration on the photodegradation of reactive blue M-2GE was investigated.The results indicated that M-2GE degradation fit first-order kinetics under our experimental conditions.The optimum efficiency for M-2GE photodegradation was found to be 99% upon photolysis for 90 min at a catalyst dosage of 3 g·L^-1,over a pH range from weakly acidic to neutral conditions（pH 4～7）.In addition,increased salt concentration led to inhibition of M-2GE photodegradation.The activity of the recycled photocatalyst remained at about 90% of its initial activity.The results reveal that hydrothermally prepared Bi2WO6 exhibits excellent photocatalytic activity under visible light irradiation.

关 键 词：Bi2WO6 可见光 水热合成 M-2GE 

分 类 号：X703[环境科学与工程—环境工程]