Facile synthesis of a novel WO3/Ag2MoO4 particles-on-plate staggered type II heterojunction with improved visible-light photocatalytic activity in removing environmental pollutants
| Autor: | Xiaobo Chen, Qipeng Yang, Song Zhiwen, Huanli Wang, Fujun Tao, Wang Yafei, Ailing Xu, Mingliang Ma |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Precipitation (chemistry) Band gap General Chemical Engineering Heterojunction 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Oxidizing agent Rhodamine B Photocatalysis Irradiation 0210 nano-technology Photodegradation |
| Zdroj: | RSC Advances. 9:34804-34813 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c9ra07175j |
| Popis: | A novel WO3/Ag2MoO4 heterojunction has been synthesized through a facile precipitation method with Ag2MoO4 particles firmly deposited on the surface of WO3 nanoplates, forming “particles-on-plate” type II heterojunction structures. This heterojunction exhibited improved photocatalytic activities for the degradation of rhodamine B (RhB), 4 chlorophenol (4-CP) and tetracycline hydrochloride (TC) under visible-light irradiation compared to pure Ag2MoO4 and WO3. In addition, the heterojunction with 10 wt% Ag2MoO4 displays the best photocatalytic performance, which was about 2 times better than that of pure WO3 or Ag2MoO4. The TC photodegradation rate reaches up to 91% within 90 min visible light irradiation. Furthermore, the photocatalytic efficiency of the Ag2MoO4/WO3 heterojunction is 1.3 times higher than that of the mixture of the two individual photocatalysts. This remarkable enhanced photocatalytic performance results from the staggered bandgap between Ag2MoO4 and WO3, which can suppress the recombination of electron–hole pairs efficiently. Moreover, based on the radical trapping experiment, the superoxide radical anions (·OH) and photogenerated holes (h+) are the crucial active oxidizing species. |
| Databáze: | OpenAIRE |
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