采用浸渍法制备Zn掺杂改性TiO₂催化剂，以对氯苯甲酸（p-CBA）为目标污染物，考察Zn/TiO₂的催化臭氧氧化效能，结果发现Zn掺杂比为0.5%的催化剂具有最佳活性。利用SEM、XRD、FT-IR、BET和等电点性质对改性催化剂进行表征，结果表明，随着Zn掺杂比的增大，催化剂的比表面积急剧降低，但等电点、表面羟基明显增多，推测等电点和表面羟基等性质的改变是导致催化剂活性增强的重要因素。另外，当溶液pH在催化剂的等电点附近时，Zn/TiO₂的催化臭氧氧化效率较高。

Zn-doped TiO₂ is prepared via the impregnation method and used in the catalytic ozonation process for the removal of p-chlorobenzoic acid (p-CBA) from aqueous solution.It is shown that Zn/TiO₂ catalyst with a Zn doping ratio of 0.5% has the best activity.The modified catalysts are characterized by SEM, XRD, FT-IR, BET and pH_PZC.It is found that specific surface area of Zn/TiO₂ decreases sharply with the increase of Zn doping ratio.By contrast, the pH_PZC value and the surface hydroxyl groups of catalysts are increased by the modification process, which may be the reason for the enhanced catalytic activity.In addition, Zn/TiO₂ catalytic ozonation process runs more efficiently when the solution pH is close to the pH_PZC of catalysts.

孟一帆(1996-),女,硕士研究生,研究方向为催化臭氧氧化技术(工业水处理),meng_ifan@163.com