以三聚氰胺、三聚氰酸和硝酸钴为原料，采用高温煅烧法制备出复合型催化剂（Co/g-C₃N₄），用其活化过一硫酸盐（PMS）降解环丙沙星（CIP）。考察了各因素对Co/g-C₃N₄活化PMS去除CIP的影响。结果表明，Co/g-C₃N₄质量浓度为0.5 g/L、PMS浓度为2 mmol/L、溶液初始pH为7、CIP初始质量浓度为5 mg/L、温度为30℃时，CIP在45 min内的去除率可达99.5%；催化剂在5次循环利用后对CIP的去除率仍有83.3%，表明Co/g-C₃N₄的可重复利用性和稳定性良好。自由基淬灭试验表明，Co/g-C₃N₄活化PMS去除CIP的机制包括自由基途径（SO₄·^-、·OH）和非自由基途径（¹O₂、O₂·^-），其中主要活性物质为¹O₂，其次为SO₄·^-。

Co/g-C₃N₄, a composite catalyst, is prepared from melamine, cyanuric acid and cobalt nitrate through high temperature calcination method, and is used to activate peroxymonosulfate (PMS) to degrade ciprofloxacin.The effects of each influencing factor on the removal of ciprofloxacin by Co/g-C₃N₄ activated PMS are investigated.It is shown that the removal rate of ciprofloxacin can reach 99.5% in 45 min when the concentration of Co/g-C₃N₄ added is 0.5 g·L^-1, the dosage of PMS is 2 mmol·L^-1, the initial pH of solution is 7, the initial concentration of ciprofloxacin is 5 mg·L^-1, and T=30℃.The removal rate of ciprofloxacin reaches still 83.3% after the catalyst has been reused for five cycles, indicating that the catalyst has a good reuse performance and stability.It is verified through free radical quenching assay that the mechanism in removing ciprofloxacin by Co/g-C₃N₄ activated PMS includes free radical pathway (SO₄·^-, ·OH) and non-free radical pathway (¹O₂, O₂·^-), in which ¹O₂ is the main active substance, followed by SO₄·^-.

段毅(1987),男,博士,工程师,研究方向为水质净化与水污染控制等,duanyi1987@163.com。