Abstract
In order to improve the visible light response, N-doping ZnS (N-ZnS) nanospheres with Zn vacancy and porous surface were prepared by a simple one-pot hydrothermal method. Characterizations and density functional theory simulations showed excellent visible light response of N-ZnS. N-doping introduced impurity energy levels, which led to orbital hybridization and changed the original dipole moment. The presence of ortho Zn vacancy (O-Znv) can effectively reduce e−-h+ recombination and photocorrosion. Furthermore, O-Znv caused lattice distortion (twisted the -S-Zn-N-(O-Znv)-S-Zn–S- chemical bond chain), resulting in “vacancy effect” to accelerate e− flow. Under visible light, the photocatalytic degradation efficiency of tetracycline (TC) and 2,4-dichlorophenol (2,4-DCP) was 90.31% and 60.84%, respectively. TOC degradation efficiency was 31.4% and 25.6%, respectively. Combined with Fukui index and LC–MS methods, it was found that TC and 2,4-DCP were degraded under the constant attack of active substances such as ·OH. This work can provide a reference for the application of catalytic materials in the field of visible light photocatalysis.
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This work was supported by CNPC safety and environmental protection key technology research and promotion project (2017D-4613) and Sub project of national science and technology major project (2016ZX05040-003).
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Conceptualization, data curation, investigation, methodology, supervision, writing: Benjie Zhu, Guofei Jiang, Can Kong, Junzhi Sun.
Project administration, resources, supervision, writing-review and editing: Fang Liu, Yongqiang Wang, Chaocheng Zhao, Chunshuang Liu.
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Zhu, B., Jiang, G., Kong, C. et al. Photocatalytic degradation of organic pollutants in water by N-doping ZnS with Zn vacancy: enhancement mechanism of visible light response and electron flow promotion. Environ Sci Pollut Res 29, 58716–58729 (2022). https://doi.org/10.1007/s11356-022-19852-1
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DOI: https://doi.org/10.1007/s11356-022-19852-1