选取水中常见的酚类物质（如邻硝基酚、邻氨基酚和邻苯二酚）作为研究对象，在以ＴｉＯ２（锐钛矿型）为催化剂、高压汞灯照射下研究其在水溶液中的降解情况。实验结果表明：酚类物质较易发生光催化降解。邻硝基酚、邻氨基酚和邻苯二酚的降解可近似看作一级反应，其半衰期分别为３２．４，２２．４，１３．９ｍｉｎ，并从反应机理上给予了解释。水中邻硝基酚的紫外吸光值随时间的变化情况的测定结果说明该物质在水中矿化较完全。 Phenols (such as o-nitrophenol, o-aminophenol and catechol), which are common in water, were selected as the research objects. Under the irradiation of high pressure mercury lamp with TiO2 (anatase type) as catalyst, Degradation. The experimental results show that: Phenol is more prone to photocatalytic degradation. The degradation of o-nitrophenol, o-aminophenol and catechol can be regarded as first-order reactions with half-lives of 32.4, 22.4 and 13.9 min, respectively, and the explanation is given from the reaction mechanism. Determination of o-nitrophenol UV absorbance value with time in water shows that the substance is completely mineralized in water.