期刊
INORGANIC CHEMISTRY COMMUNICATIONS
卷 113, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.inoche.2020.107806
关键词
BiOI/BiOCl; Heterojunction; Charge pairs separation efficiency; Ionic liquid
资金
- National Natural Science Foundation of China [21777168]
- Science and Technology Department of Sichuan Province [2019YJ0457, 2019ZYZF0069]
- Project of Zigong City [2018YYJC10]
- Graduate student Innovation Fund of Sichuan University of Science and Engineering [Y2018060]
- Opening Project of Jiangsu Key Laboratory for Environment Functional Materials [SJHG1805]
- Opening Project of Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province [CSPC201903]
In this contribution, BiOI/BiOCl heterojunctions were successfully synthesized with the assistance of reactable ionic liquid (IL) 1-propyl-3-methylimidazolium iodide ([PrMIm]I) via a hydrothermal method. The crystal structures, morphologies, chemical compositions, optical properties and separation efficiency of photo-generated charge pairs of the as-prepared BiOI/BiOCl heterojunctions were characterized by various analytic methods. Surface photovoltage spectroscopy (SPS) and photoelectrochemical measurements reveal that the BiOI/BiOCl heterojunctions exhibit higher separation efficiency of photo-generated charge pairs than the reference BiOCl and BiOI. XPS results reveal that I element exists in the as-prepared samples with a chemical valence of - 1, and when the mass ratio of [PrMIm]I/BiOCl is 8%, the sample holds the highest surface hydroxyl content. Photocatalytic performance of the as-fabricated photocatalysts was evaluated by abatement of rhodamine B (RhB) aqueous solution under simulated sunlight irradiation. BiOI/BiOCl heterojunctions exhibit enhanced photocatalytic performance; the 8% sample displays the highest photocatalytic activity. Trapping experiments certify that the superoxide radicals (O-center dot(2)-) is the predominant active free radicals in the photocatalytic degradation process of RhB over the BiOI/BiOCl heterojunctions. In light of experimental results, a possible Z-scheme photocatalytic degradation mechanism was discussed to elaborate the separation and migration of the photo-induced electron-hole pairs. This study provides a useful reference for ILs assisted fabrication of high efficiency photocatalytic materials.
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