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Enhancing the photocatalytic activity of BiOX (X = Cl, Br, I), (BiO)2CO3 and Bi2O3 by modifying their surfaces with polar organic anions, 4-substituted thiophenolates

Abstract

When its surface is modified by polar organic anions, 4-substituted thiophenolate anions 4-Z-C6H4S- (Z = NO2, COOH, H, CH3, NH2), the Bi-based semiconductor BiO(HCOO) was found to exhibit a greatly enhanced photocatalytic activity. To establish the generality of this phenomenon, we examined the photocatalytic activities of other Bi-based semiconductors, BiOX (X = Cl, Br, I), (BiO)2CO3 and Bi2O3, by modifying their surfaces with 4-carboxythiophenolate (4CBT) anions. As observed for BiO(HCOO), it is found that the surface modification with the 4CBT anions enhances the photocatalytic activities of BiOX (X = Cl, Br, I), (BiO)2CO3 and Bi2O3, and this enhancement originates from a synergetic effect between the polarity of the polar organic anions and the internal electric field of those Bi-based semiconductors. Several factors affecting the photocatalytic activity were probed in some detail, which includes the nature of the facets and the sample sizes modified by 4CBT in BiOCl and (BiO)2CO3, the structures of Bi2O3 phases as well as the electron-withdrawing or electron-donating ability of the 4-substituent Z of 4-Z-C6H4S- in BiOX (X = Cl, Br, I).

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Publication details

The article was received on 08 May 2017, accepted on 13 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03970K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Enhancing the photocatalytic activity of BiOX (X = Cl, Br, I), (BiO)2CO3 and Bi2O3 by modifying their surfaces with polar organic anions, 4-substituted thiophenolates

    B. Xu, Y. An, Y. Liu, X. Qin, X. Zhang, D. Ying, Z. Wang, P. Wang, M. Whangbo and B. Huang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03970K

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