Journal
SOLID STATE SCIENCES
Volume 52, Issue -, Pages 106-111Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2015.12.020
Keywords
Semiconductor; TiO2; Surface; Photocatalytic performance; Charge separation
Funding
- Sichuan University of Science and Engineering [2013PY03]
- Project of Zigong city [2015HX20]
- Construct Program of the Discipline in Sichuan University of Science and Engineering
- Opening Project of Key Laboratory of Green Catalysis of Sichuan Institutes of High Education [LZJ1301, LZY1101, LYJ14203]
- Sichuan Provincial Academician (Expert) Workstation [2015YSGZZ03]
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In this work, BiOI decorated TiO2 photocatalysts were prepared in-situ by a facile hydrothermal method and characterized by X-ray diffraction (XRD), UV/Vis diffuse reflectance spectroscopy, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and surface photovoltage (SPV) spectroscopy. The reactive radicals during the photocatalytic reaction were detected by scavenger experiments. BiOI/TiO2 composites exhibit higher performance than the pure TiO2 towards photocatalytic decolorization of methyl orange (MO) aqueous solution, when the molar ratio of Bi/Ti is 2%, the sample has the highest photocatalytic activity. The enhanced photocatalytic performance of BiOI/TiO2 could be ascribed to the separation properties of photo-induced charge carriers and strong interaction between BiOI and TiO2. Based on the observations, a Z-scheme charge separation mechanism was proposed. (C) 2015 Elsevier Masson SAS. All rights reserved.
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