期刊
SOLAR ENERGY
卷 249, 期 -, 页码 712-724出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2022.12.011
关键词
ZnO; Fe 3 O 4 heteronanostructures; Visible -light photocatalytic; Methylene blue; Degradation efficiency; Visible light; Mole ratio
资金
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.02-2019.32]
ZnO/Fe3O4 heteronanostructures exhibited enhanced photocatalytic activity under both UV and visible light, with up to 99.7% degradation efficiency for methylene blue. The enhancement could be explained by electron transfer.
ZnO/Fe3O4 heteronanostructures (HNSs) have attracted great attention due to their possibility of removing organic pollutants in aqueous solutions, then detaching from aqueous solutions by magnetic fields. However, there is a lack of research on their photocatalytic performance under visible light irradiation and the mechanism for the degradation process is still arguable. We present here the enhancement in the photocatalytic activity of ZnO/Fe3O4 HNSs, synthesized by a facile hydrothermal technique, under both Ultraviolet (UV) and visible light irradiation. Particularly, the methylene blue (MB) degradation efficiency exhibited a great enhancement of up to 99.7% and 79.7% for HNSs with different ZnO:Fe3O4 mole ratios of 16:1 and 8:1 under UV and visible light, respectively. It could be explained by the transfer of electrons (i) from the conduction band (CB) of ZnO to that of Fe3O4 or/and (ii) from the CB of Fe3O4 to new defect states (e.g., Fe2+/Fe3+ levels) below the CB of ZnO. Additionally, ZnO/Fe3O4 HNSs show great stability in their photocatalytic activities when remained 95.1% and 92.1% after 5-reused cycles under UV and visible light irradiation, respectively. Therefore, the fabricated ZnO/ Fe3O4 HNSs show great potential for enhancing the MB degradation efficiency under both UV and visible light.
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