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Activation of hydrogen peroxide by molybdenum disulfide as Fenton-like catalyst and cocatalyst:Phase-dependent catalytic performance and degradation mechanism

查看全文 作　　者：Yue [1]Li;Bo [1,2]Yu;Huimin [1,2]Li;Bo [1]Liu;Xiang [1]Yu;Kewei [1]Zhang;Gang [2]Qin;Jiahao [1]Lu;Lihui [1]Zhang;Longlu [3]Wang 高影响力作者 机构地区：[1]School of Chemical and Printing-Dyeing Engineering,Henan International Joint Laboratory of Rare Earth Composite Materials,Henan University of Engineering,Xinzheng 451191,China;[2]School of Material Science and Engineering,Henan Polytechnic University,Jiaozuo 454001,China;[3]College of Electronic and Optical Engineering&College of Microelectronics,Institute of Flexible Electronics(Future Technology),Nanjing University of Posts&Telecommunications,Nanjing 210023,China高影响力机构 出　　处：《Chinese Chemical Letters》索引2023年第34卷第5期,共5页高影响力期刊 基　　金：financially supported by the Natural Science Foundation of Henan Province(No.212300410336);Program for Science and Technology Innovation Talent in Universities of Henan Province(No.20HASTIT016);National Natural Science Foundation of China(No.51902101)。 摘　　要：Molybdenum disulfide(Mo S_(2))has attracted great attention in hydrogen peroxide(H_(2)O_(2))activation as a Fenton-like catalyst and cocatalyst,but the distinct mechanism of generating^(·)OH remains unclear.In this paper,the metallic 1T phase and semiconducting 2H phase of Mo S_(2)nanosheets were prepared and applied in MoS_(2)/H_(2)O_(2)and MoS_(2)/Fe^(2+)/H_(2)O_(2)systems with and without light irradiation.Compared with2H-MoS_(2),1T-MoS_(2)exhibited superior removal rates in degrading organic pollutants in the two systems under light irradiation.However,the phase had little effect on activating H_(2)O_(2)in the Mo S_(2)/H_(2)O_(2)system under dark conditions.This is because it was difficult for the surface^(·)OH_(ads)generated in the Mo S_(2)/H_(2)O_(2)system to diffuse into solution,while the^(·)OH_(free)radicals were mainly responsible for degrading organic pollutants.When introducing light irradiation,external energy may accelerate the desorption of^(·)OH_(ads)into^(·)OH_(free.)Interestingly,the conversion between Mo^(4+)and Mo^(5+)triggered the decomposition of H_(2)O_(2)in the Fenton-like reaction,while the cycle of Mo^(4+)/Mo^(6+)promoted the regeneration of Fe^(3+)when employing 1T-MoS_(2)as a cocatalyst.Meanwhile,the 1T-MoS_(2)catalysts exhibited excellent stability and ability to degrade various organics in the two systems.This work offers deeper insight into the Mo S_(2)-based Fenton-like and cocatalytic mechanisms. 关 键 词：Molybdenum sulfate PHASE Fenton-like catalyst COCATALYST Catalytic mechanism
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