文献类型：期刊文献

英文题名：Dramatic enhancement effects of l-cysteine on the degradation of sulfadiazine in Fe3+/CaO2 system

作者：Lu, Jian[1];Wang, Tenghao[1];Zhou, Yi[1];Cui, Changzheng[1,2];Ao, Zhimin[3];Zhou, Yanbo[1,2]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, 1515 Zhongshan Second North Rd, Shanghai 200092, Peoples R China;[3]Guangdong Univ Technol, Guangdong Key Lab Environm Catalysis & Hlth Risk, Inst Environm Hlth & Pollut Control, Sch Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China

年份：2020

卷号：383

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20193807443106);WOS:【SCI-EXPANDED(收录号:WOS:000502887900048)】；

基金：This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB0602601), the National Natural Science Foundation of China (Grant No. 51778230), Shanghai Rising-Star Program (Grant No. 17QA1401000), and the Fundamental Research Funds for the Central Universities for their financial support(Grant No. 222201718003).

语种：英文

外文关键词：Sulfadiazine; Calcium peroxide; l-cysteine; Fenton

摘要：Excessive sulfonamides accumulated in soil and groundwater seriously menace the ecological environment and human health. The performance of a Fenton-like system applying Fe3+ and calcium peroxide (CaO2) in the presence of lcysteine(l-cys) for sulfadiazine (SDZ) degradation was investigated. Compared with other chelating agents such as citric acid, butyric acid and Ethylenediaminetetraacetic acid, L-cys could effectively promote the SDZ removal in Fe3+/CaO2 system. With the addition of 0.5 mM l-cys, the SDZ degradation increased from 2.14% to 66.53% in 60 min. High concentration of HCO3- inhibited the degradation of SDZ while slightly negative effects on SDZ degradation were observed in the presence of Cl- or humic acid (HA) in l-cys/Fe3+/CaO2 system. Electron paramagnetic resonance (EPR) analysis and radicals scavenge tests affirmed the generation of (OH)-O-center dot and O-2-(center dot) in l-cys/Fe3+/CaO2 system. Possible degradation pathway of SDZ was speculated and the toxicity of SDZ intermediates was further evaluated. 1-cys could enhance the reduction of Fe3+ to Fe2+ and reduced the Fe3+ precipitation due to the L-cys could form stable complexes with Fe3+. L-cys/Fe3+/CaO2 system exhibited high mineralization ability. Overall, these results indicated that L-cys is a promising chelating agent for sulfadiazine wastewater treatment.