Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 174, Issue -, Pages 105-112Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2015.03.001
Keywords
BiOCl; Visible light; Surface modification; Multi-electron redox; Photocatalysis
Funding
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- National Natural Science Foundation of China (NSFC) [21273038, 51372266]
- Natural Science Foundation of Jiangsu Province [BK20130348]
- Fund of Key Laboratory of Optoelectronic Materials Chemistry and Physics, Chinese Academy of Sciences [2008DP173016]
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Hierarchical BiOCl microflowers have been synthesized by one-step solvothermal method, which are constructed from many thin nanosheets by exposing the highly active highly active {001} facets. Considering the wide band gap of BiOCl microflowers (3.4 eV), the amorphous Fe(III) clusters were grafted on the surfaces through a simple impregnation method to extend the photocatalytic activity to the visible light region. The obtained products were characterized by X-ray diffraction, scanning electron and transmission microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, nitrogen adsorption-desorption, and electrochemical measurements. It is found that the Fe(III) clusters are just deposited on the surfaces rather than doped in the lattices of BiOCl. The morphologies and-crystal structures of BiOCl microflowers thus remain unchanged after modification of Fe(III) clusters. The photocatalytic activity for the decomposition gaseous acetaldehyde can be significantly improved by the modification of Fe(III) clusters under visible light irradiation. The surface Fe(III) clusters play an important role in the interfacial charge transfer for the visible light absorption. Furthermore, together with the strong oxidative holes in the valence band of BiOCl, the Fe(III) clusters can serves as the redox reaction centers for the multi-electron reduction of oxygen molecules, resulting in the full decomposition of acetaldehyde into CO2. (C) 2015 Elsevier B.V. All rights reserved.
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