文献类型：期刊文献

英文题名：Simultaneous removal of benzene, toluene, ethylbenzene and xylene (BTEX) by CaO2 based Fenton system: Enhanced degradation by chelating agents

作者：Xue, Yunfei[1];Lu, Shuguang[1];Fu, Xiaori[1,3];Sharma, Virender K.[2];Mendoza-Sanchez, Itza[2];Qiu, Zhaofu[1];Sui, Qian[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Texas A&M Univ, Dept Environm & Occupat Hlth, Sch Publ Hlth, Program Environm & Sustainabil, 1266 TAMU, College Stn, TX 77843 USA;[3]Univ Arizona, Sch Earth & Environm Sci, Soil Water & Environm Sci Dept, 429 Shantz Bldg, Tucson, AZ 85721 USA

年份：2018

卷号：331

起止页码：255

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20173704147227);WOS:【SCI-EXPANDED(收录号:WOS:000414155500029)】；

基金：This study was financially supported by the grant from the National Natural Science Foundation of China (41373094, 21577033, and 51208199), Natural Science Foundation of Shanghai (16ZR1407200), China Postdoctoral Science Foundation (2015M570341) and the Fundamental Research Funds for the Central Universities (222201514339 and 22A201514057). Virender K. Sharma acknowledge the support of United States National Science Foundation (CBET-1439314).

语种：英文

外文关键词：Calcium peroxide; Ferrous iron; Chelating agents; BTEX; Groundwater remediation

摘要：Most of the calcium peroxide (CaO2) based Fenton oxidation studies focus on the individual pollutant degradation. In this study, the simultaneous oxidation of benzene, toluene, ethylbenzene, and xylene (denoted as BTEX) by CaO2 based Fenton system was demonstrated. It was observed that BTEX removal increased with increasing molar ratios of CaO2/Fe(II)/BTEX. In the case of CaO2/Fe(II)/BTEX molar ratio of 5/5/1, BTEX removal were 35% in the ultrapure water and 15% in the actual groundwater. In the case of CaO2/Fe(II)/BTEX molar ratio of 40/40/1, BTEX removal were elevated to 98% in the ultrapure water and 88% in the actual groundwater. Chelating Fe(II) agents, such as citric acid (CA), oxalic acid (OA), and glutamic acid (GA), significantly enhanced the destruction of BTEX. When the molar ratio of Fe(II)/CA, Fe(II)/GA, and Fe(II)/OA was 10/20 while fixing CaO2/Fe(II)/BTEX molar ratio of 10/10/1, the enhancements in BTEX removal were 60%, 32%, and 72%, respectively. In terms of BTEX removal, OA chelated Fe(II) was demonstrated to be most effective in the CaO2/Fe(II)/BTEX system. Based on TOC analysis, the transformation effect was confirmed. The transformation products of BTEX were determined and oxidation pathways were proposed, in which HO center dot was mostly responsible to the parent compounds mineralization.