Surface sulfur vacancies enhanced electron transfer over Co-ZnS quantum dots for efficient degradation of plasticizer micropollutants by peroxymonosulfate activation  

作　　者：Yuting Gu Tingting Gao Fagen Zhang Chao Lu Wenrui Cao Ziwei Fu Chun Hu Lai Lyu 

机构地区：[1]Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Ministry of Education,Institute of Environmental Research at Greater Bay,Guangzhou University,Guangzhou 510006,China [2]Shandong Key Laboratory of Water Pollution Control and Resource Reuse,School of Environmental Science and Engineering,Shandong University,Qingdao 266237,China [3]School of Environmental Science and Engineering,Guangzhou University,Guangzhou 510006,China [4]Institute of Rural Revitalization,Guangzhou University,Guangzhou 510006,China

出　　处：《Chinese Chemical Letters》2022年第8期3829-3834,共6页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52070046,52122009,51808140and 51838005);the Introduced of Innovative R&D Team Project under the“Pearl River Talent Recruitment Program”of Guangdong Province(No.2019ZT08L387);the Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme(Young Scholar);the support from the BL14W1beamline of Shanghai Synchrotron Radiation Facility(SSRF,China)。

摘　　要：Peroxymonosulfate(PMS)activation in heterogeneous processes is a promising water treatment technology.Nevertheless,the high energy consumption and low efficiency during the reaction are ineluctable,due to electron cycling rate limitation.Herein,a new strategy is proposed based on a quantum dots(QDs)/PMS system.Co-ZnS QDs are synthesized by a water phase coprecipitation method.The inequivalent lattice-doping of Co for Zn leads to the generation of surface sulfur vacancies(SVs),which modulates the surface of the catalyst to form an electronic nonequilibrium surface.Astonishingly,the plasticizer micropollutants can be completely degraded within only tens of seconds in the Co-Zn S QDs/PMS system due to this type of surface modulation.The interfacial reaction mechanism is revealed that pollutants tend to be adsorbed on the cobalt metal sites as the electron donors,where the internal electrons of pollutants are captured by the metal species and transferred to the surface SVs.Meanwhile,PMS adsorbed on the SVs is reduced to radicals by capturing electrons,achieving effective electron recovery.Dissolved oxygen(DO)molecules are also easily attracted to catalyst defects and are reduced to O_(2)^(·-),further promoting the degradation of pollutants.

关 键 词：Peroxymonosulfate activation Sulfur vacancy Quantum dots ZNS PLASTICIZER 

分 类 号：TQ426[化学工程] X703[环境科学与工程—环境工程]