TiO2晶型与光催化活性关系的研究

随着工业的发展，人类本来很有限的水资源却受到日益严重的污染，清除水体中的有毒有害化学物质已成为环保领域中的一项重要工作，传统的水污染治理方法存在着能耗大、二次污染及降解不完全等缺点，而光催化降解技术可为这些问题提供较好的解决手段。光催化剂多为半导体氧化物，它们在一定波长光的照射下可将价带电子激发到带产生光生电子－空穴对，该光生电子－空穴对具有较强的氧化还原能力，可氧化水体中大部分有机污染物，TiO2以其良好的禁带宽度、较高的催化活性、抗光腐蚀及无毒、稳定性好等优点，已成为光催化剂研究的热点，本文选择具有典型偶氮染料结构的甲基橙水溶液为研究体系，对TiO2晶型与光催化活性之间的关系进行研究，得到一些有益的结果。

Studies on the Relationship Between the Crystal Form of TiO2 and Its Photocatalyzing Degradation Efficiency

A series of studies were carried out to investigate the effect of crystal forms of TiO2 on the activities in the photocatalyzing degradation of aqueous methyl orange. It is shown that the rutile could hardly catalyze the degradation of the methyl orange and anatase is more effective for catalyzing the degradation than rutile. Moreover, the activities of mixed-crystalline forms of TiO2 vary with the change of the values of A/R, the best of which is 9∶1. Some characterizations with XRD, XPS and SPS were performed and explanations to the phenomena that exist in photodegradation are given out.