采用碳化热解法在TiO₂催化剂表面制备石墨烯层，并对其进行XRD、Raman、NH₃-TPD、BET、pH_zpc等表征。以对氯苯甲酸（p-CBA）为目标物，考察石墨烯改性TiO₂在催化臭氧氧化过程中的效能。结果表明，热解温度、碳源投量、固化剂投量等因素对催化剂的活性有较大影响。负载石墨烯层可显著增加TiO₂催化剂的比表面积，并使其表面酸性增强，因而提高其催化臭氧氧化活性。另外，考察了溶液pH、叔丁醇对改性TiO₂催化臭氧氧化过程的影响。溶液pH为6时，对氯苯甲酸的去除率最低。叔丁醇严重抑制了对氯苯甲酸的降解反应，间接证明了羟基自由基是催化臭氧氧化过程中的主要活性氧化物种。重复使用实验结果表明，改性后的催化剂具有良好的稳定性。

Graphene modified titanium dioxide is prepared through carbonization pyrolysis method, and characterized by means of XRD, Raman, NH₃-TPD, BET, pHzpc, etc.Taking p-chlorobenzoic acid as object substance, the efficiency and performance of graphene modified titanium dioxide is evaluated in catalytic ozonation process.It is shown that the catalytic activity of graphene modified titanium dioxide can be affected by pyrolysis temperature, the dosages of carbon source and curing agent.The loaded graphene layer can greatly increase specific surface area and surface acidity of titanium dioxide catalyst, which results in the enhancement of catalytic activity.Some experimental parameters are investigated, such as the solution pH and the addition of tert butanol.The removal of p-chlorobenzoic acid is the lowest at pH 6.The presence of tert butanol greatly inhibits the degradation process of p-chlorobenzoic acid, meaning that the catalytic ozonation reaction follows the mechanism of hydroxyl radicals.The stability of graphene modified titanium dioxide catalyst is verified by the repeated experiment.

乔函(1993-),女,硕士研究生,主要研究方向为臭氧催化氧化处理煤化工废水,Qiaohan2014@163.com。