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https://hdl.handle.net/2440/115848
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Type: | Journal article |
Title: | Three-dimensional BiOI/BiOX (X = Cl or Br) nanohybrids for enhanced visible-light photocatalytic activity |
Author: | Liu, Y. Xu, J. Wang, L. Zhang, H. Xu, P. Duan, X. Sun, H. Wang, S. |
Citation: | Nanomaterials, 2017; 7(3):64-1-64-19 |
Publisher: | MDPI AG |
Issue Date: | 2017 |
ISSN: | 2079-4991 2079-4991 |
Statement of Responsibility: | Yazi Liu, Jian Xu, Liqiong Wang, Huayang Zhang, Ping Xu, Xiaoguang Duan, Hongqi Sun and Shaobin Wang |
Abstract: | Three-dimensional flower-like BiOI/BiOX (X = Br or Cl) hybrids were synthesized via a facile one-pot solvothermal approach. With systematic characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET)specific surface area, X-ray photoelectron spectroscopy (XPS), and the UV-Vis diffuse reflectance spectra (DRS), the BiOI/BiOCl composites showed a fluffy and porous 3-D architecture with a large specific surface area (SSA) and high capability for light absorption. Among all the BiOX (X = Cl, Br, I) and BiOI/BiOX (X = Cl or Br) composites, BiOI/BiOCl stands out as the most efficient photocatalyst under both visible and UV light irradiations for methyl orange (MO) oxidation. The reaction rate of MO degradation on BiOI/BiOCl was 2.1 times higher than that on pure BiOI under visible light. Moreover, BiOI/BiOCl exhibited enhanced water oxidation efficiency for O₂ evolution which was 1.5 times higher than BiOI. The enhancement of photocatalytic activity could be attributed to the formation of a heterojunction between BiOI and BiOCl, with a nanoporous structure, a larger SSA, and a stronger light absorbance capacity especially in the visible-light region. The in situ electron paramagnetic resonance (EPR) revealed that BiOI/BiOCl composites could effectively evolve superoxide radicals and hydroxyl radicals for photodegradation, and the superoxide radicals are the dominant reactive species. The superb photocatalytic activity of BiOI/BiOCl could be utilized for the degradation of various industrial dyes under natural sunlight irradiation which is of high significance for the remediation of industrial wastewater in the future. |
Keywords: | BiOI/BiOCl visible light photocatalysis heterojunction degradation water oxidation |
Description: | Published: 14 March 2017 |
Rights: | © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
DOI: | 10.3390/nano7030064 |
Grant ID: | http://purl.org/au-research/grants/arc/DP150103026 |
Published version: | http://dx.doi.org/10.3390/nano7030064 |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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hdl_115848.pdf | Published version | 3.02 MB | Adobe PDF | View/Open |
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