文献类型：期刊文献

英文题名：Piezoelectric field-promoted heterogeneous sono-Fenton performance of MoS2/α-Fe2O3 heterojunction structure

作者：Hu, Shiyu[1,2];Li, Yuanyuan[1,2];Zang, Chengjie[1,2];Ma, Xujun[1,2];Zhao, Bin[3];Chen, Feng[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Shenzhen Univ, Coll Mat Sci & Engn, 1066 Xueyuan Ave, Shenzhen 518055, Guangdong, Peoples R China

年份：2020

卷号：534

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20203509119737);WOS:【SCI-EXPANDED(收录号:WOS:000582367700007)】；

基金：This work was supported by the National Natural Science Foundation of China (21677049, 21876051, and 21805187) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：alpha-Fe2O3; MoS2; Heterojunction; H2O2; Piezoelectric field; Interfacial electron migration

摘要：The limited Fe-III/Fe-II cycle in iron-based heterogeneous catalysts is one of the main technical obstacles to the heterogeneous Fenton-like application. This work demonstrates the catalytic performance improvement of MoS2/alpha-Fe2O3 heterojunction in the Fenton-like reaction, specifically in the sono-Fenton reaction. The rate constant of degrading Acid Orange 7 (AO7) with MoS2/alpha-Fe2O3 heterojunction presents ca. 26.0 and 14.8 times higher than those with pristine alpha-Fe2O3 and MoS2 catalysts, respectively. Experiments with the addition of various scavengers demonstrated that O-1(2), radical O-center dot(2)-, and radical (OH)-O-center dot are the dominant, sub-dominant, and least-dominant ROS in the reaction, respectively. The reaction mechanism is further proposed on account of the characterization and experimental results. MoS2 participates in the Fenton-like reaction as a catalyst; besides, the Fesingle bondS bond observed at the interface accelerates the FeIII/FeII cycle by enhancing the electron transfer from Mo to Fe. Notably, ultrasonic irradiation evokes a piezoelectric potential on the surface of MoS2, which reduces the interfacial barrier height of MoS2/alpha-Fe2O3 heterojunction, accelerating the electron transfer through the Fesingle bondS bond and thus dramatically boosting the sono-Fenton activity. These findings could provide an alternative strategy to enhance the iron-based heterogeneous Fenton catalytic reactivity.