文献类型：期刊文献

英文题名：Comparative studies of H2O2/Fe(II)/formic acid, sodium percarbonate/Fe(II)/formic acid and calcium peroxide/Fe(II)/formic acid processes for degradation performance of carbon tetrachloride

作者：Jiang, Wenchao[1,2];Tang, Ping[1];Lu, Shuguang[1,2];Xue, Yunfei[1];Zhang, Xiang[1];Qiu, Zhaofu[1];Sui, Qian[1,2]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2018

卷号：344

起止页码：453

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20181404969134);WOS:【SCI-EXPANDED(收录号:WOS:000430695300045)】；

基金：This study was financially supported by the grant from the National Natural Science Foundation of China (41373094, 21577033, and 51208199) and Natural Science Foundation of Shanghai (16ZR1407200).

语种：英文

外文关键词：Sodium percarbonate; Calcium peroxide; Formic acid; Carbon tetrachloride; Groundwater remediation

摘要：The chemical degradation performance of carbon tetrachloride (CT), one of the harmful groundwater contaminants, by H2O2/Fe(II)/formic acid (FA), sodium percarbonate (SPC)/Fe(II)/FA and calcium peroxide (CP)/Fe(II)/FA processes was investigated and compared. The results showed that under the same molar ratio of 12/12/12/1 of oxidant/Fe(II)/FA/CT (initial CT = 0.13 mM), oxidant CP performed better than SPC and H2O2 with CT removal of 88.9%, 42.5% and 12.5%, respectively. Scavenging tests and electron paramagnetic resonance (EPR) detection confirmed that in the presence of FA, carbon dioxide anion (CO2 center dot(-)) was the main responsible radical for CT removal. Mass balance of chloride ions released from CT confirmed the complete mineralization of CT, and CT degradation pathways were proposed. Moreover, effects of the initial solution pH, Cl-, HCO3-, NO3- and SO42- anions were also investigated. CT could be effectively degraded among a wider pH range of 4-10 in SPC/Fe(II)/FA process, but only in acidic condition in CP/Fe(II)/FA process. HCO3- anions negatively affected CT degradation, and CP was more sensitive to HCO3- than SPC. CT degradation performance in actual groundwater demonstrated the feasibility of both SPC/Fe(II)/FA and CP/Fe(II)/FA processes, therefore providing useful information of potential alternatives for oxidant selection.