文献类型：期刊文献

英文题名：USPIO assisting degradation of MXC by host/guest-type immobilized laccase in AOT reverse micelle system

作者：Yang, Yu-Xiang[1];Pi, Na[1];Zhang, Jian-Bo[2];Huang, Yan[1];Yao, Ping-Ping[1];Xi, Yan-Jie[1];Yuan, Hong-Ming[3]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Peking Univ, Dept Environm Sci, Beijing 100871, Peoples R China;[3]Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

年份：2016

卷号：23

期号：13

起止页码：13342

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;EI(收录号：20242616467092);WOS:【SCI-EXPANDED(收录号:WOS:000378817300069)】；

基金：This work was supported by the National Natural Science Foundation of China (20577010, 20971043) and the Open Project Program of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University.

语种：英文

外文关键词：Tubularmesoporous silica; Ultrasmall superparamagnetic iron oxide nanoparticles; Host/guest-type immobilized laccase; Degradation; Methoxychlor

摘要：The laccase and ultrasmall superparamagnetic iron oxide nanoparticles (USPIO) have been assembled inside the tubular mesoporous silica via co-adsorption technology to prepare host/guest-type immobilized laccase, which is applied to degrade methoxychlor (MXC) in aqueous and reverse micelle environments. The effects of various parameters on degradation of MXC were studied. Under the optimum conditions, the degradation rate could reach maximum value of 45.6 % and remain at 20.8 % after seven cycles. Moreover, the addition of small molecular compound 2, 2'-azinobis-(3-ethylbenzthiazoline-6-sulphonate) to the system could greatly improve the degradation efficiency. The MXC degradation process is a first-order reaction, and the activation energy of MXC degradation catalyzed by immobilized laccase (41.46 kJ mol(-1)) is relatively lower than that catalyzed by free laccase (44.91 kJ mol(-1)). Based on the degradation products measured by gas chromatograph-mass spectrometer (GC-MS) and nuclear magnetic resonance (NMR), the degradation mechanism of MXC has also been proposed.