Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 368, Issue -, Pages 204-213Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2019.01.009
Keywords
Tin disulfide; Oxides; Quantum dots; Doping; Heterostructure; Photocatalysis
Categories
Funding
- National Natural Science Foundation of China [21601120, 11375111]
- Science and Technology Commission of Shanghai Municipality [17ZR1410500]
- Natural Science Research Project of Anhui Education Department [KJ2016A510]
- Excellent Youth Talents Project of Anhui Education Department [gxyq2017104]
- Educational Quality Project of Anhui Province [2015jyxm398]
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Construction of heterostructures with proper band alignment and effective transport and separation of photo generated charges is highly expected for photocatalysis. In this work, Ni-doped SnO2-SnS2 heterostructures (NiSnSO) are simply prepared by thermal oxidation of Ni-doped hierarchical SnS2 microspheres in the air. When applied for the photodegradation of organic contaminants, these NiSnSO exhibit excellent catalytic performance and stability due to the following advantages: (1) Ni doping leads to the enhancement of light harvesting of SnS2 in the visible light regions; (2) the formed heterojunctions promote the transport and separation of photo generated electrons from SnS2 to SnO2; (3) Ni-SnO2 quantum dots facilitate the enrichment of reactants, provide more reactive centers and accelerate product diffusion in the reactive centers; (4) the SnS2 hierarchical microspheres constituted by nanoplates provide abundant active sites, high structural void porosity and accessible inner surface to faciliate the catalytic reactions. As a result, the optimized NiSnSO can photodegrade 92.7% methyl orange within 80 min under the irradiation of simulated sunlight, greatly higher than those of pure SnS2 (29.8%) and Ni-doped SnS2 (52.1%). These results reveal that the combination of heteroatom doping and heterostructure fabrication is a very promising strategy to deliver nanomaterials for effectively photocatalytic applications.
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