Catalytic Ozone Degradation of Iopachol Wastewater by Non-Metal Doped g-C3N4
C or Cl atoms were doped into g-C3N4(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 O3/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·O2-are the major free radicals accounting for the IPM degradation.
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