Effect and mechanism on the degradation of aqueous bisphenol A by zero valent iron activated peroxyacetic acid system
Bisphenol A(BPA)is a representative pollutant in phenolic industrial wastewater.Zero valent iron(ZVI)was used to activate peroxyacetic acid(PAA)to remove BPA from water.The effects of ZVI and PAA dosage,pH value,and typical coexisting anions in industrial wastewater on PAA activation and BPA degradation were investigated,and the reaction mechanism of ZVI activation of PAA was analyzed by exploring the reactive species and active sites.Under the optimal process conditions of adding 50 mg/L ZVI,1.00 mmol/L PAA and an initial pH of 3.4,the ZVI/PAA system can remove 99.24%of BPA in water for 30 minutes.HCO3-and SO42-showed inhibitory effects on BPA degradation,while Cl-(0-20.0 mmol/L)accelerated the degradation of BPA in ZVI/PAA system.Soluble Fe(Ⅱ)and Fe(Ⅲ)were released from ZVI and its surface oxide layer,respectively,during the reaction.The released Fe(Ⅱ)activation of PAA contributed 26.46%of BPA degradation,while heterogeneous ZVI activation of PAA played a major role in BPA degradation.Scavenging experiment showed that CH3 C(O)OO·,CH3 C(O)O·,·OH and FeⅣO2+ were produced in ZVI/PAA system,among which CH3 C(O)OO·and FeⅣO2+ were the major reactive species contributing to BPA degradation.This study provided data and theoretical support for the effective removal of bisphenol A in industrial wastewater.
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