文献类型：期刊文献

英文题名：Removal of decabromodiphenyl ethane (DBDPE) by BC/nZVI in the soil: Kinetics, pathways and mechanisms

作者：Lu, Cong[1];Wan, Jiang[1];Chen, Xiao[1];Zhang, Wei[1,2];Lin, Kuangfei[1];Peng, Cheng[1,2]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Shanghai Acad Environm Sci, Shanghai 200233, Peoples R China

年份：2022

卷号：10

期号：1

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20215211400088);WOS:【SCI-EXPANDED(收录号:WOS:000765951700001)】；

语种：英文

外文关键词：DBDPE; BC; nZVI; Soil; Debromination; Removal mechanisms

摘要：Decabromodiphenyl ethane (DBDPE), as a crucial novel brominated flame retardant, has been widely used in the world, of which the accumulation in soil also poses a significant threat to human health. Biochar (BC) and nanozero-valent iron (nZVI) are environmental-friendly remediation materials for contaminants. In this study, the biochar-supported nZVI (BC/nZVI) particles were synthesized using bagasse at 600 degrees C under nitrogen protection and then were used to remove DBDPE in a soil system. The results indicated that BC was a good carrier for nZVI due to the decrease of agglomeration. The highest removal efficiency of BC/nZVI was up to 86.91% at 24 h at a mass ratio of 2:1 (BC:nZVI), which was much higher than BC or nZVI alone. The degradation kinetics of BC/nZVI to DBDPE followed the pseudo-first-order reaction model well. DBDPE was firstly removed by the adsorption of BC from soil via 7C-7C interactions and hydrogen bonds, and then was oxidized by .OH generated from BC forming DBDPE-C--O (DP-1). Subsequently, the debromination of DP-1 gradually occurred by the .H from surface hydrolysis of nZVI attacking the bromide on the benzene ring. This technology may act as a promising way for the remediation of highly DBDPE-contaminated soil.