首页|Cu Distribution Pattern Controlled Active Species Generation and Sulfamethoxazole Degradation Routes in a Peroxymonosulfate System
Cu Distribution Pattern Controlled Active Species Generation and Sulfamethoxazole Degradation Routes in a Peroxymonosulfate System
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The distribution pattern of metals as active centers on a substrate can influence the peroxymonosulfate(PMS)activation and contaminants degradation.Herein,atomic layer deposition is applied to prepare Cu single atom(SA-Cu),cluster(C-Cu),and film(F-Cu)decorated MXene catalysts by regulating the number of deposition cycles.In comparison with SA-Cu-MXene(adsorption energy(Eads)=-4.236 eV)and F-Cu-MXene(Eads=-3.548 eV),PMS is shown to adsorb preferably on the C-Cu-MXene surface for activation(Eads=-5.435 eV),realizing higher utilization efficiency.More SO4·-are generated in C-Cu-MXene/PMS system with steady-state concentration and 1-3 orders of magnitude higher than those in the SA-Cu-MXene and F-Cu-MXene activated PMS systems.Particularly,the contribution of SO4·-oxidation to sul-famethoxazole(SMX)degradation followed the order,C-Cu-MXene(97.3％)＞SA-Cu-MXene(90.4％)＞F-Cu-MXene(71.9％),realizing the larger SMX degradation rate in the C-Cu-MXene/PMS system with the degradation rate constants(k)at 0.0485 min1.Additionally,SMX degradation routes in C-Cu-MXene/PMS system are found with fewer toxic intermediates.Through this work,we highlighted the importance of guided design of heterogeneous catalysts in the PMS system.Appropriate metal distribution patterns need to be selected according to the actual water treatment demand.Metal sites could be then fully uti-lized to produce specific active species to improve the utilization efficiency of the oxidants.
Cu clusterDistribution patternPeroxymonosulfateActive speciesDegradation routes
Ning Li、Haoxi Dai、Mengting He、Jun Wang、Zhanjun Cheng、Beibei Yan、Wenchao Peng、Guanyi Chen
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School of Environmental Science and Engineering & Tianjin Engineering Research Center of Bio Gas/Oil Technology,Tianjin University,Tianjin 300072,China
Department of Chemical Engineering,Tianjin University,Tianjin 300350,China
School of Mechanical Engineering,Tianjin University of Commerce,Tianjin 300134,China
School of Science,Tibet University,Lhasa 850012,China
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National Natural Science Foundation of ChinaNatural Science Foundation of TianjinShenzhen Science and Technology ProgramShenzhen Science and Technology Program
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