Ferrokinetics Promoted by Protocatechuic Acid and Enhanced Fenton System for DEET Degradation
In order to reduce the dosage of Fe(Ⅱ)in traditional Fenton system and improve the utilization rate of H2O2,protocatechuic acid(PCA)was added to achieve iron cycle in Fenton system.With diethyltoluamide(DEET)as the target pollutant,under the optimal reaction conditions:c(DEET)0=0.2 mmol/L,c(H2O2)=1.0 mmol/L,n(H2O2)/n[Fe(Ⅱ)]=20:1,n(PCA)/n[Fe(Ⅱ)]=1:1,pH value=3.0,DEET degradation rate could reach 75％within 20 min.The changes of total iron(TFe)and Fe(Ⅱ)concentration during DEET degradation were recorded,which proved that PCA could be used as a reducing agent to promote ironcycle in the system besides improving the solubility of iron ions in the solution as a complex agent.Using tert-butanol(TBA)and p-benzoquinone(PBQ)as radical quenchers to identify the main active substances in the reaction system,it was concluded that hydroxyl radical(·OH)played the main oxidation role in Fe(Ⅱ)/PCA/H2O2 system.The results of coexisting ion experiments showed that the presence of SO42-had no effect on the degradation of DEET.For the degradation of common pollutants,PCA/Fe(Ⅱ)/H2O2 system has good universality.
万方数据
维普
