Crystal facets engineering and rGO hybridizing for synergistic enhancement of photocatalytic activity of nickel disulfide
| Autor: | Qing Yang, Yan Liang, Cailei Yuan, Keng Xu, Ting Yu, Pengyuan Shi, Yong Yang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Materials science Sulfide Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences law.invention Metal Crystal law Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences chemistry.chemical_classification 021110 strategic defence & security studies Graphene business.industry Pollution Nickel Semiconductor Nanocrystal Chemical engineering chemistry visual_art visual_art.visual_art_medium Photocatalysis business |
| Zdroj: | Journal of hazardous materials. 384 |
| ISSN: | 1873-3336 |
| Popis: | Crystal facets engineering and graphene hybridizing have been proved to be effective means to improve the photocatalytic activities of semiconductor photocatalysts in recent years. However, most of these efforts are concentrated in metal oxides. In the present study, crystal facets effect on the photocatalytic activity of metal sulfide NiS2 was studied for the first time. It was found that the {111}-faceted NiS2 nanocrystals showed improved photocatalytic activity in the degradation of various typical pollutants in water compared with {100}-faceted NiS2 nanocrystals. Moreover, through hybridizing with rGO nanosheets, the photocatalytic activity of the {111}-faceted NiS2 nanocrystals can be further improved, resulting in the complete degradation of heavy metal hexavalent chromium and organic dyes. The photocatalytic mechanism was studied in detail through theory calculation and experimental characterization. It was found that both the surface energies of Ni-terminated and S-terminated {111} facets were much higher than that of {100} facets, indicating that {111} facets were more active. Besides, rGO hybridizing can realize the effective separation of photogenerated electrons and holes. The results provide important guidance for the further development of efficient metal sulfide photocatalysts. |
| Databáze: | OpenAIRE |
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