Simultaneous removal of Cr(VI) and phenol contaminants using Z-scheme bismuth oxyiodide/reduced graphene oxide/bismuth sulfide system under visible-light irradiation
| Autor: | Xin Xin, Zhaoyong Bian, Jie Xu, Hui Wang, Acong Chen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Chromium
Environmental Engineering Materials science Light Health Toxicology and Mutagenesis Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology Sulfides 010402 general chemistry 01 natural sciences Redox Catalysis law.invention Bismuth Metal chemistry.chemical_compound Phenols law Environmental Chemistry Phenol Aqueous solution Graphene Public Health Environmental and Occupational Health General Medicine General Chemistry Photochemical Processes 021001 nanoscience & nanotechnology Pollution 0104 chemical sciences chemistry visual_art visual_art.visual_art_medium Photocatalysis Graphite 0210 nano-technology Oxidation-Reduction |
| Zdroj: | Chemosphere. 188:659-666 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2017.09.002 |
| Popis: | An all-solid-state Z-scheme system containing Bi-based semiconductors bismuth oxyiodide (BiOI) and bismuth sulfide (Bi2S3) was constructed on reduced graphene oxide (rGO) sheets through an electrostatic self-assembly method to simultaneously remove aqueous Cr(VI) and phenol. In this Z-scheme that mimicked natural photosynthesis, photoinduced electrons in the conduction band (CB) of BiOI were transferred through rGO and reacted with photoinduced holes in the valence band (VB) of Bi2S3, which significantly increased its photocatalytic activity. The reduction and oxidation reactions were performed on Bi2S3 and BiOI photocatalysts, respectively. Furthermore, complex contaminants of coexisting heavy metal Cr(VI) and organic phenol were treated using the system under visible-light irradiation. Results showed that Cr(VI) reduction and phenol oxidation were achieved efficiently with optimum reductive and oxidative efficiencies up to 73% and 95% under visible-light irradiation, respectively. This work provided a promising method of simultaneously removing heavy metals and organic pollutants by using a Z-scheme system with enhanced photocatalytic activity. |
| Databáze: | OpenAIRE |
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