文献类型：期刊文献

英文题名：Pyrite-assisted degradation of methoxychlor by laccase immobilized on Fe3S4/earthworm-like mesoporous SiO2

作者：Yang, Jiaqi[1];Yang, Yuxiang[1];Chang, Ziling[1];Huang, Yan[1];Yuan, Hongming[2];Zhao, Yi[1];Liu, Xiangnong[3];Ni, Chaoying[4]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Jilin Univ, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China;[3]Yangzhou Univ, Anal Test Ctr, Yangzhou 225009, Peoples R China;[4]Univ Delaware, Dept Mat Sci & Engn, Newark, DE 19716 USA

年份：2024

卷号：31

期号：17

起止页码：25202

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;EI(收录号：20241115728861);WOS:【SCI-EXPANDED(收录号:WOS:001180387500002)】；

基金：This work was supported by the National Natural Science Foundation of China (20577010, 20971043).

语种：英文

外文关键词：Methoxychlor; Immobilized laccase; Fe3S4/earthworm-like mesoporous SiO2

摘要：Laccase immobilized and cross-linked on Fe3S4/earthworm-like mesoporous SiO2 (Fe3S4/EW-mSiO(2)) was used to degrade methoxychlor (MXC) in aqueous environments. The effects of various parameters on the degradation of MXC were determined using free and immobilized laccase. Immobilization improved the thermal stability and reuse of laccase significantly. Under the conditions of pH 4.5, temperature 40 degrees C, and reaction time 8 h, the degradation rate of MXC by immobilized laccase reached a maximum value of 40.99% and remained at 1/3 of the original after six cycles. The excellent degradation performance of Fe3S4/EW-mSiO(2) was attributable to the pyrite (FeS2) impurity in Fe3S4, which could act as an electron donor in reductive dehalogenation. Sulfide groups and Fe2+ reduced the activation energy of the system resulting in pyrite-assisted degradation of MXC. The degradation mechanism of MXC in aqueous environments by laccase immobilized on Fe3S4/EW-mSiO(2) was determined via mass spectroscopy of the degradation products. This study is a new attempt to use pyrite to support immobilized laccase degradation.