期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 428, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.128215
关键词
Sulphur vacancy; Vacancy concentration; Vacancy state; Photocatalytic degradation
资金
- National Natural Science Foundation of China [51778172, 51978089]
This study investigates the influence of defects on catalytic activity by optimizing the concentration of sulfur vacancies in a catalyst. The results show that the influence of sulfur vacancy concentration on catalytic activity varies, revealing the fundamental essence of defect behavior affecting crystal catalytic activity.
Defect engineering is crucial in the development of semiconductor catalyst activity. However, the influence of defect/vacancy density and states on catalysis remains vague. Thus, the optimized sulfur vacancy (S-V) state is achieved among Fe-ZnS models (ZFS) via a chemical etching strategy for photocatalytic degradation (PD). As the SV concentration (rho S-V) increases, the predominant state of vacancies changes from isolated defects-a state to a combination of a state and vacancy clusters-e state, as verified by positron annihilation and X-ray absorption fine structure spectra. However, the two types of defect states activated the intrinsic activity of the crystal via radically different mechanisms and exerted different degrees of influence on PD activity, as revealed by first-principles calculations and quantitative structure-activity relationship. Our results suggest that the S-V activity is strongly influenced by its concentration in the ZFS crystal, while the vacancy concentration is not a control parameter for the PD activity, but a defect form. The underlying essence of atomic defects behavior affecting crystal catalytic activity at the atomic level is also revealed in this paper. Uncovering these structural relationships provide a theoretical basis for designing effective catalysts.
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