Effects of operating conditions on iron(hydr)oxides evolution and ciprofloxacin degradation in potassium ferrate-ozone stepwise oxidation system  

作　　者：Xiaochen Li Yifan Wang Ning Wang Mei Li Maomao Bai Jingtao Xu Hongbo Wang 

机构地区：[1]School of Municipal and Environmental Engineering,Shandong Jianzhu University,Jinan 250101,China [2]Resources and Environment Innovation Institute,Shandong Jianzhu University,Jinan 250101,China

出　　处：《Journal of Environmental Sciences》2024年第1期367-378,共12页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.51878394);the Introduction and Cultivation Plan for Young Innovative Talents of Colleges and Universities by the Education Department of Shandong Province。

摘　　要：In this study,a stepwise oxidation system of potassium ferrate(K_(2)FeO_(4))combined with ozone(O+3)was used to degrade ciprofloxacin(CIP).The effects of pH and pre-oxidation time of K_(2)FeO_(4) on the evolution of K_(2)FeO_(4) reduction products(iron(hydr)oxides)and CIP degradation were investigated.It was found that in addition to its own oxidation capacity,K_(2)FeO_(4) can also influence the treatment effect of CIP by changing the catalyst content.The presence of iron(hydr)oxides effectively enhanced the mineralization rate of CIP by catalyzing ozonation.The pH value can influence the content and types of the components with catalytic ozonation effect in iron(hydr)oxides.The K_(2)FeO_(4) pre-oxidation stage can produce more iron(hydr)oxides with catalytic components for subsequent ozonation,but the evolution of iron(hydr)oxides components was influenced by O_(3) treatment.It can also avoid the waste of oxidation capacity owing to the oxidation of iron(hydr)oxides by O_(3) and free radicals.The intermediate degradation products were identified by Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR-MS).Besides,the degradation pathways were proposed.Among the degradation products of CIP,the product with broken quinolone ring structure only appeared in the stepwise oxidation system.

关 键 词：Potassium ferrate reduction products Catalytic ozonation CIPROFLOXACIN Potassium ferrate pre-oxidation time 

分 类 号：X703[环境科学与工程—环境工程]