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污染控制技术及原理

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.

Abstract：Anew type of visible light reactive photocatalyst, Bi₂WO₆,was prepared by hydrothermal synthesis,and the influence of catalyst dosage,M-2GE concentration,pHand 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 pHrange 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.