Reinventing MoS2 Co-catalytic Fenton reaction:Oxygen-incorporation mediating surface superoxide radical generation  

作　　者：Xianjun Tan Wenhui Ding Zhenying Jiang Linxiao Sun Yuxiong Huang 

机构地区：[1]Environmental Science and New Energy Technology Research Center,Tsinghua-Berkeley Shenzhen Institute(TBSI),Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China

出　　处：《Nano Research》2022年第3期1973-1982,共10页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.42077293 and 22006088);Natural Science Foundation of Guangdong Province(Nos.2019A1515011692 and 2019QN01L797);Shenzhen Municipal Science and Technology Innovation Committee(Nos.JCYJ20190809181413713 and WDZC20200817103015002);Y.X.H.also thanks the financial support from Overseas Cooperation Research Fund of Tsinghua Shenzhen International Graduate School(Nos.HW2020002 and QD2021010N);This work was also supported by the China Postdoctoral Science Foundation(No.2019M66067).

摘　　要：To better understand the mechanisms of hydrogen peroxide(H_(2)O_(2))’s decomposition and reactive oxygen species(ROS)’s formation on the catalyst’s surface is always a critical issue for the environmental application of Fenton/Fenton-like reaction.We here report a new approach to activate H_(2)O_(2) in a co-catalytic Fenton system with oxygen incorporated MoS2,namely MoS_(2−x) O_(x) nanosheets.The MoS_(2−x) O_(x) nanosheets assisted co-catalytic Fenton system exhibited superior degradation activity of emerging antibiotic contaminants(e.g.,sulfamethoxazole).Combining density functional theory(DFT)calculation and experimental investigation,we demonstrated that oxygen incorporation could improve the intrinsic conductivity of MoS_(2−x) O_(x) nanosheets and accelerate surface/interfacial charge transfer,which further leads to the efficacious activation of H_(2)O_(2).Moreover,by tuning the oxygen proportion in MoS_(2−x) O_(x) nanosheets,we are able to modulate the generation of ROS and further direct the oriented-conversion of H_(2)O_(2) to surface-bounded superoxide radical(·O_(2−surface)).It sheds light on the generation and transformation of ROS in the engineered system(e.g.,Fenton,Fenton-like reaction)for efficient degradation of persistent pollutants.

关 键 词：Co-catalytic Fenton reaction MoS2 nanosheets reactive oxygen species(ROS) superoxide radical antibiotics’degradation 

分 类 号：O643.3[理学—物理化学]