以Keggin型铜取代杂多阴离子PW11O39Cu(Ⅱ)(H2O)5-[PW11Cu]为可见光催化剂,有机染料罗丹明B(RhB)为模型污染物,研究了在可见光照射下PW11Cu对RhB的可见光催化降解作用,提出了PW11 Cu可见光催化作用的反应机理,同时考察了RhB初始浓度、PW11Cu初始浓度和溶液pH值对RhB光催化降解速率的影响.实验结果表明,含有15.6 μmol/L PW11Cu+ 10 μmol/L RhB的水溶液在可见光照射下反应80 min,RhB的降解率达100％,总有机碳去除率约33％.RhB的可见光催化降解服从准一级动力学方程,在RhB初始浓度为20、30和40 μmol/L的情况下,其表观一级速率常数分别为3.1 ×10-2、2.0×10-2和1.5×10-2 min-1.
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