以钛酸四丁酯Ti(OC4H9)4为TiO2前驱体,Keggin型铬取代的杂多阴离子PW11Cr为可见光活性组分,采用溶胶-凝胶提拉法在玻片表面制备了PW11Cr/TiO2纳米膜光催化剂,并用UV-Vis DRS、IR、XRD、SEM和TEM等技术手段对催化剂的光吸收性质、化学组成、晶相和表面结构形貌等进行了表征;讨论了膜中PW11 Cr和TiO2相互作用的方式;以染料模型污染物RhB的可见光催化降解为探针,评估了PW11 Cr/TiO2光催化剂的可见光催化活性,讨论了光催化反应机理,并与TiO2的光催化反应机理进行了比较;考察了焙烧温度、PW11 Cr剂量和溶液pH值对光催化活性的影响;最后用RhB的循环降解实验评估了催化剂的光催化稳定性.实验结果表明,PW11 Cr/TiO2光催化剂对可见光有明显吸收,较低焙烧温度(100℃)下得到的膜为无定形结构,而较高焙烧温度(500 ℃)为纳晶结构;前者的光催化活性较高,在200 W金卤灯照射下降解10 μmol/LRhB,120 min的降解率为95％,4h的COD去除率为72％;羟基自由基是导致RhB降解的主要氧活性物质;低的膜处理温度,高的PW11Cr负载量和溶液酸性有利于提高PW11 Cr/TiO2膜的光催化活性;经循环重复使用10次,PW11 Cr/TiO2膜的光催化活性仅有较少损失.
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