Citation: Yuting Gu, Tingting Gao, Fagen Zhang, Chao Lu, Wenrui Cao, Ziwei Fu, Chun Hu, Lai Lyu. Surface sulfur vacancies enhanced electron transfer over Co-ZnS quantum dots for efficient degradation of plasticizer micropollutants by peroxymonosulfate activation[J]. Chinese Chemical Letters, ;2022, 33(8): 3829-3834. doi: 10.1016/j.cclet.2021.12.004 shu

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

Yuting Gu ^a ,
Tingting Gao ^a ,
Fagen Zhang ^c ,
Chao Lu ^a ,
Wenrui Cao ^{a, b} ,
Ziwei Fu ^c ,
Chun Hu ^a ,
Lai Lyu ^{a, d, *,}

a.
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
b.
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
c.
School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
d.
Institute of Rural Revitalization, Guangzhou University, Guangzhou 510006, China

lyulai@gzhu.edu.cn

Received Date: 22 September 2021
Revised Date: 27 October 2021
Accepted Date: 1 December 2021
Available Online: 6 December 2021

Figures(4)

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-ZnS 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 O₂^•−, further promoting the degradation of pollutants.
- Peroxymonosulfate activation,
- Sulfur vacancy,
- Quantum dots,
- ZnS,
- Plasticizer
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