In situ synthesis of a cadmium sulfide/reduced graphene oxide/bismuth Z-scheme oxyiodide system for enhanced photocatalytic performance in chlorinated paraben degradation
| Autor: | Acong Chen, Zhaoyong Bian, Hui Wang, Yajing Yang, Ning Ma |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Graphene General Chemical Engineering Oxide Nanoparticle chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Industrial and Manufacturing Engineering Cadmium sulfide 0104 chemical sciences Bismuth law.invention chemistry.chemical_compound chemistry law Photocatalysis Reductive dechlorination Environmental Chemistry Degradation (geology) 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 359:530-541 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2018.11.181 |
| Popis: | An efficient reduced graphene oxide (rGO)-based cadmium sulfide/reduced graphene oxide/bismuth oxyiodide (CdS/rGO/BiOI) Z-scheme system was fabricated by an in-situ growth method. Solid interactions between the rGO and nanoparticles promoted the transmission of photoinduced carriers, which separated and accumulated electrons from CdS and holes from BiOI. Moreover, the Z-scheme system enabled CdS electrons to maintain a high reduction capability and BiOI holes to maintain a high oxidation capability. Therefore, the CdS/rGO/BiOI composite exhibited better photocatalytic activity in the degradation of methyl 3,5-dichloro-4-hydroxybenzoate (MDHB) than that of pure CdS and BiOI under visible light irradiation. In particularly, the identification of active species and transformation products revealed that the accumulated photoinduced electrons promoted the reductive dechlorination of MDHB. The dechlorinated byproducts were then oxidatively split and degraded into harmless small-molecule carboxylic acids or inorganic substances by photoinduced holes. This work provided a favorable in situ growth method to design and synthesize Z-scheme photocatalysts for simultaneous chlorinated paraben dechlorination and degradation under visible light irradiation. |
| Databáze: | OpenAIRE |
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