Enhanced photocatalytic degradation of bisphenol A by Co-doped BiOCl nanosheets under visible light irradiation
| Autor: | Ying-Jie Zhang, Gui-Xiang Huang, Xing Zhang, Wei-Kang Wang, Chu-Ya Wang, Jie-Jie Chen, Dan-Ni Pei, Han-Qing Yu |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Band gap Process Chemistry and Technology Doping chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry Electrochemistry 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Photocatalysis Degradation (geology) Bismuth oxychloride 0210 nano-technology Cobalt General Environmental Science Visible spectrum |
| Zdroj: | Applied Catalysis B: Environmental. 221:320-328 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2017.09.036 |
| Popis: | Bismuth oxychloride (BiOCl) is a typical UV-light-sensitive photocatalyst with a unique layered structure, but exhibits no response towards visible light. This is a main limitation for its practical applications in photocatalytic degradation of pollutants. Among various methods to expand the light absorption region, doping modification is an efficient approach because it can tailor the band structure by forming a doping energy level without changing the layered structure substantially. In this case, the static electric field in the BiOCl crystal can be retained. Since cobalt (Co) exhibits good electrochemical properties, it is an ideal element for doping modification to expand the light absorption region and enhance the charge separation efficiency of BiOCl. In this work, Co-doped BiOCl nanosheets were prepared using a simple hydrothermal route. The doped Co expanded the light absorption region and enhanced the charge separation efficiency by forming a doping energy level in the band gap of BiOCl. As a result, the Co-BiOCl nanosheets exhibited an outstanding photocatalytic performance in degrading bisphenol A (BPA) under visible light irradiation with a degradation rate of 3.5 times higher than that of BiOCl. On the basis of the experimental results and density functional theory calculations, the mechanism of visible-light-driven catalytic BPA degradation by the Co-BiOCl nanosheets was elucidated. Therefore, the feasibility of Co-doping modification for BiOCl was confirmed, and a novel and efficient strategy was provided for the design and synthesis of high-performance photocatalysts. |
| Databáze: | OpenAIRE |
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