文献类型：期刊文献

英文题名：Efficient removal of roxarsone and emerging organic contaminants by a solar light-driven in-situ Fenton system

作者：Zhou, Yi[1,2,3];He, Jie[1];Li, Xia[1];Lu, Jian[1];Zhou, Yanbo[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Engn Res Ctr Multimedia Environm Catalys, Shanghai 200237, Peoples R China

年份：2022

卷号：435

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20220511569175);WOS:【SCI-EXPANDED(收录号:WOS:000773718000003)】；

基金：Acknowledgments This work was supported by the National Natural Science Foundation of China (Nos. 51778230 and 21906056) , Program of Shanghai Outstanding Technology Leaders (Grant No. 20XD1433900) , Shanghai Municipal Science and Technology (No. 20DZ2250400) and Shanghai Sailing Program (No. 19YF1411900) .

语种：英文

外文关键词：In-situ Fenton; Resorcinol formaldehyde resin; H2O2 generation; Roxarsone (ROX); Inorganic arsenic (iAs)

摘要：High-risk roxarsone (ROX) can be converted to highly toxic arsenite (As(III)) through biological and abiotic processes, which can cause severe arsenic contamination of water and crops. Traditional oxidation processes can only treat organic arsenic compounds instead of releasing inorganic arsenic (iAs). Herein, an Fe(II)/resorcinol formaldehyde resin (RF) solar light-driven in-situ Fenton system was applied to remove ROX and its released iAs. Under solar light illumination, RF can reduce oxygen to produce H2O2 through a two-electron reduction pathway. Fe(II) simultaneously catalyzed the decomposition of H2O2 to generate center dot OH, participating in the oxidation of ROX. The C-As bond of ROX was preferentially attacked by center dot OH to form 2-nitrohydroquinone and As (III). Moreover, As(III) was further converted to low-toxicity arsenate (As(V)) through further oxidation with oxygen bubbling. Finally, the released As(III) (1.9%) and As(V) (98.1%) were removed by adsorption onto the surface of ferric hydroxide. As a result, more than 99.9% of ROX was degraded by the Fe(II)/RF in-situ Fenton system during the pre-oxidation process. The total organic carbon (TOC) removal efficiency of ROX and total arsenic removal efficiency of the Fe(II)/RF-O-2 in-situ Fenton system reached 75% and more than 97%, respectively. Furthermore, the residual arsenic in this Fenton system was less than 12.5 mu g/L, which met the recommended limit for arsenic (100 mu g/L) in reclaimed water. In addition to the removal of ROX, the Fe(II)/RF in-situ Fenton system showed excellent general applicability in the removal of emerging organic contaminants (EOCs). The TOC removal rate of EOCs was approximately 50%-64%. Thus, the Fe(II)/RF-O-2 solar light-driven in-situ Fenton system provides a novel strategy for the high-efficiency removal of organoarsenic compounds and EOCs.