硅藻土负载氯氧化铋光降解水中有机污染物研究

Photocatalytic degradation of organic pollutant in water by diatomite supported BiOCl

采用简单水热法制备硅藻土负载氯氧化铋(BiOCl)复合催化剂,并以水体中的污染物罗丹明B(RhB)为降解目标研究其可见光催化降解性能。结果表明,硅藻土的表面电性有助于改变合成BiOCl的反应历程,最终影响BiOCl的暴露晶面;硅藻土负载BiOCl复合催化剂具有吸附和光催化协同降解污染物的特性,且可见光利用率显著增大,在可见光下BiOCl(1.20)对RhB的降解率可达95%以上,表明硅藻土负载BiOCl复合催化剂是一种高活性的光催化剂。

Bismuth oxychloride(BiOCl)/diatomite composites with enhanced photocatalytic property were successfully prepared by a facile hydrothermal method at pH=6.The structure and property characterizations of the composites exhibited that diatomite did not only as the support of photocatalyst but act as dominant facets regulator,owing to the surface electrical property of the diatomite and interaction between diatomite and BiOCl.Furthermore,the addition of diatomite both improved the adsorption property of photocatalyst compared with pure BiOCl,which contribute to the enhanced photocatalytic properties when used to degrade the rhodamine B(RhB).The optimum photocatalytic property of the composites was BiOCl(1.20),reaching 95%degradation rate of RhB at 30 min.The results shown that the diatomite supported BiOCl was a kind of highly active photocatalyst.