非金属掺杂g-C_(3)N_(4)催化臭氧降解碘帕醇废水

Catalytic Ozone Degradation of Iopachol Wastewater by Non-Metal Doped g-C_(3)N_(4)

本文采用高温煅烧法将C原子或Cl原子掺杂进g-C_(3)N_(4)(Cl-CN和C-CN),并将其应用于催化臭氧氧化去除水中碘帕醇(IPM)的研究。通过多种表征手段对其晶体结构、形貌特征进行探讨,同时探究其运行参数对催化臭氧性能的影响,结果表明,在催化剂投加量为500 mg·L^(-1),污染物浓度为5 mg·L^(-1),pH值为6的条件下,反应15 min后,Cl-CN和C-CN催化臭氧氧化IPM去除率分别可达92.6%和92%。在循环实验中,C-CN和Cl-CN展现了良好的稳定性和可回收性。自由基抑制剂实验和XPS表征表明·OH和·O_(2)^(-)为系统主要的活性氧物种。

C or Cl atoms were doped into g-C_(3)N_(4)(Cl-CN and C-CN)by high temperature calcination method,which were applied to ozonation system for the iopamol(IPM).The crystal structure and morphology of catalytic ozone were studied by various characterization methods,and the effect of operating parameters on catalytic ozone performance was also investigated.The results showed that under the conditions of catalyst dosage of 500 mg·L^(-1),pollutant concentration of 5 mg·L^(-1)and pH of 6,after reaction for 15 min,the removal rates of IPM in O_(3)/Cl-CN and O3/C-CN systems were 92.6%and 92%.Cl-CN and C-CN showed good stability and reusability in the cycling experiment.Free radical inhibitor experiments and XPS results demonstrated that·OH and·O_(2)^(-)are the major free radicals accounting for the IPM degradation.