在导电玻璃FTO基底上,利用电泳沉积技术成功制备了ZnO/SnO2复合薄膜,并对样品进行了SEM和XRD表征,并以降解罗丹明B为模型反应,考察不同条件下制备的复合薄膜的光催化活性。结果表明电泳沉积时间为20min时,可得到表面致密均匀的ZnO薄膜,膜厚为0.5μm,且随着电泳沉积时间的延长,薄膜的光催化速率不断增加,沉积时间为20min时,光催化速率达到最大（0.016min-1）,如此优异的光催化性能可能是由于异质结构光催化剂ZnO/SnO2减小光生电子-空穴的复合几率,提高了复合催化剂的光催化效率。此外,还研究了热处理温度对ZnO/SnO2复合薄膜光催化效率的影响,结果发现在300℃热处理的光催化薄膜对罗丹明B的降解率最好,活性最高。
ZnO/SnO2 composite films were prepared on electro-conductive glass substrate by an electrophoretic deposition（EPD） method and were further characterized by SEM and XRD.The results showed that the optimum deposition time for obtaining compact and uniform films is about 20min,and these films with 20min deposition min showed the highest photocatalytic activity（0.016min-1）for photocatalytic decolorization of Rhodamine-B aqueous solution.A hetero-junction structure composed of ZnO and SnO2 is formed and makes it easier for exitons to be separated and result in a higher activity.Moreover,the effects of calcination temperature on the photocatalytic activity of ZnO/SnO2 composite films were further investigated.The decoloring rate will be decreased as raising the calcination temperature,and at 300℃,the ZnO/SnO2 composite films showed the highest photocatalytic activity.
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