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Investigation on Effect of Anion Layer on Photocatalytic Activity: Carbonate vs. Oxalate

Abstract

It still remains unknown to the influence of anion layer on photochemical property for the layer structure. In this work, we have mainly investigated the photochemical properties of Bi2O2CO3 and Bi(C2O4)OH. It is found that although with the similar layer structure, Bi2O2CO3 shows an activity 1.15 and 2.48 times higher than Bi(C2O4)OH for the degradation of phenol and Rhodamine B (RhB) under UV light irradiation (λ400 nm), respectively, which has been mainly attributed to their different anion layers. For Bi2O2CO3, the CO32- ions connect with one another to form a linked anion layer, but the alternated [Bi2O2]2+ and CO32- layers are completely separate; whereas for Bi(C2O4)OH, the C2O42- ions do not link with each other, but the oxygen bridges form between the [Bi2O2]2+ and C2O42- layers. The results demonstrate that an internal electric field (IEF) is favored by the separate [Bi2O2]2+ and CO32- layers, which can greatly improve the charge separation rate. In contrast, the oxygen bridges between [Bi2O2]2+ and C2O42- layers does not favor to form an IEF, resulting in a low charge separation rate. This finding suggests that the layer semiconductors with the completely separate cation and anion layers could be developed as the efficient photocatalysts.

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Publication details

The article was received on 28 Mar 2017, accepted on 05 Jun 2017 and first published on 06 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ00938K
Citation: New J. Chem., 2017, Accepted Manuscript
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    Investigation on Effect of Anion Layer on Photocatalytic Activity: Carbonate vs. Oxalate

    W. Hao, F. teng, W. Gu, Z. Liu, A. Zhang and Z. Liu, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00938K

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