以尿素为原料，采用热聚合法合成光催化剂石墨相氮化碳（g-C₃N₄），并研究其光催化剂性能。通过X射线衍射仪（XRD）、自带能谱分析的扫描电镜（SEM-EDS）、傅里叶红外光谱仪（FT-IR）、热重分析仪（TG/DTG）和紫外-可见分光光度计（UV-Vis DRS）等对光催化剂的结构、形貌、表面官能团、热稳定和光学性能进行表征分析。考察了g-C₃N₄的合成温度、g-C₃N₄质量浓度、过硫酸钠（SPS）质量浓度、酮洛芬（KTP）初始质量浓度、溶液初始pH、降解时间及催化剂循环使用次数等因素对光催化降解KTP的影响。结果表明，500℃合成的g-C₃N₄呈片状多孔纳米结构，具有最佳的光催化性能；在光照功率为35 W、pH为9、SPS初始质量浓度为1.20 g/L、g-C₃N₄质量浓度为1.00 g/L、降解时间为150 min时，初始质量浓度为2 mg/L的KTP的降解率为96.84%；催化剂经回收连续使用5次，可将初始质量浓度为2 mg/L的KTP溶液光催化降解至100 μg/L，可满足回用水要求。

Photocatalyst g-C₃N₄ is synthesized by thermal polymerization with urea as raw material, and its photocatalytic properties are investigated.The structure, morphology, surface functional groups, thermal stability and optical properties of the samples are characterized and analyzed by means of XRD, SEM-EDS, FT-IR, TG/DTG and UV-Vis DRS.Furthermore, the effects of factors including synthesis temperature of g-C₃N₄, dosage of g-C₃N₄, initial concentration of sodium persulfate, initial concentration of ketoprofen, initial pH of solution, degradation time and cycle number of photocatalyst on photocatalytic degradation of ketoprofen are studied.The results show that g-C₃N₄ synthesized at 500℃ exhibits lamellar porous nanostructures and has the best photocatalytic property.The degradation rate of ketoprofen with an initial concentration of 2 mg·L^-1 reaches 96.84% when initial pH of solution is 9, initial concentration of sodium persulfate is 1.2 g·L^-1, mass concentration of g-C₃N₄ is 1.00 g·L^-1, degradation time is 150 min and the lighting power is 35 W.Even g-C₃N₄ photocatalyst has been recycled and continuously used for 5 times, it can still degrade ketoprofen with an initial concentration of 2 mg·L^-1 to 100 μg·L^-1, therefore makes the treated water meet the requirements of the company.

刘嘉琪(1998-),女,硕士研究生,研究方向为光催化,1136223085@qq.com。