研究了Ti基底的预处理方法对其负载的TiO2薄膜光催化活性和长期稳定性的影响. 分别采用扫描电子显微镜、 X射线光电子能谱、 X射线衍射和电化学交流阻抗谱对样品进行了表征,并考察了Ti基底负载的TiO2膜光催化降解模型污染物苯甲酰胺和活性艳红X-3B的活性. 结果表明,采用普通Na2CO3预处理Ti基底时制得的TiO2膜层较疏松,并且由于Ti基底自身生成的TiO2钝化膜层不断生长而导致其负载的TiO2光催化膜层明显脱落流失,该TiO2膜在水中浸泡60 d后即完全失活. 而在乙二酸活化法预处理的Ti基底上能制备出致密的TiO2光催化膜,可抑制Ti基底自钝化膜的生长,从而显著提高了负载TiO2光催化膜的抗脱落流失能力,在水中浸泡280 d后,其光催化活性仍不低于新制备样品活性的70%;而且在35 d的活性艳红完全脱色连续流实验中,该TiO2光催化膜基本未发生失活现象.
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