Journal
APPLIED SURFACE SCIENCE
Volume 479, Issue -, Pages 745-756Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.02.136
Keywords
Bismuth oxyhalides; Semiconductor materials; Photocatalysis; Methyl orange; Rhodamine B
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Funding
- Indo-Hungarian TET project [TET_15_IN-1-2016-0013]
- Department of Science and Technology, Delhi, India [INT/HUN/P-06/2016]
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Bismuthoxyhalides photocatalysts (BiOX, X= Cl, Br, I) were prepared using solvothermal crystallization method. The influence of the synthesis temperature (120 degrees C, 140 degrees C, 160 degrees C) and duration (3 h, 24 h, 48 h) on the structural (crystal size, phase composition etc.), morphological (crystal shape), optical (bandgap values) parameters and on the resulting photocatalytic activity were investigated. The samples were characterized by the means of X-ray diffractometry (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the synthesized materials was evaluated under visible-(>= 400 nm) and UV light (approximate to 365 nm) by degrading methyl orange and Rhodamine B (RhB). The results pointed out the importance of the crystallization temperature and duration in achieving the highest photocatalytic activity, showing that the lowest temperature and the shortest duration time resulted the highest removal yields. Furthermore, a possible degradation mechanism was elaborated based on a direct hole oxidation approach and the detected degradation intermediates.
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