文献类型：期刊文献

英文题名：Comparative studies of organic contaminant removal in different calcium sulfite-enhanced oxidant/Fe(II) systems: Kinetics, mechanisms, and differentiated degradation pathways

作者：Zhou, Zhengyuan[1];Huang, Jingyao[1];Zeng, Guilu[1];Yang, Rumin[1];Xu, Zhiqiang[1];Habib, Mudassir[1];Sui, Qian[1];Lyu, Shuguang[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China

年份：2023

卷号：458

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20232614328359);WOS:【SCI-EXPANDED(收录号:WOS:001031905900001)】；

基金：This study was financially supported by a grant from the National Natural Science Foundation of China (No. 41977164) .

语种：英文

外文关键词：Calcium sulfite; Removal mechanisms; Degradation pathways; Reactive species; Groundwater remediation

摘要：The application of S(IV) for the regeneration of Fe(II) has been widely investigated. As the common S(IV) sources, sodium sulfite (Na2SO3) and sodium bisulfite (NaHSO3) are soluble in the solution, resulting in excessive SO32  concentration and redundant radical scavenging problems. In this research, calcium sulfite (CaSO3) was applied as the substitution for the enhancement of different oxidant/Fe(II) systems. The advantages of CaSO3 could be summarized as follows: (1) it could sustainedly supplement SO32  for Fe(II) regeneration, preventing radical scavenging and unnecessary reagent waste; (2) the cost and toxicity of CaSO3 were extremely lower than that of other S(IV) sources; (3) the concentration of reactive species increased in the presence of CaSO3; and (4) after the reaction, SO42  would form CaSO4 precipitate, which would not increase the burden of SO42  in the solution. In the participation of CaSO3, the removal of trichloroethylene (TCE) and other organic contaminants were significantly promoted and different enhanced systems had high tolerance on complex solution conditions. The major reactive species in different systems were determined through qualitative and quantitative analyses.