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Issue 34, 2017
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Hierarchical core–shell SiO2@PDA@BiOBr microspheres with enhanced visible-light-driven photocatalytic performance

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Abstract

To explore catalysts combining highly accessible specific surface areas with low recombination of the photo-induced electron–hole pairs, a novel SiO2@PDA@BiOBr composite photocatalyst with a hierarchical core–shell structure was prepared by a facile solvothermal method. The catalyst shows a superior performance on photodegradation of Rhodamine B under visible light irradiation, especially for SiO2@PDA-2@BiOBr with the reactant kinetics constant (k = 0.0487 min−1). The enhanced photocatalytic performance of SiO2@PDA-2@BiOBr was ascribed to the decreased band-gap, higher surface area, and effectively photo-generated electron–hole pairs by the introduction of polydopamine (PDA). In addition, the photocatalytic degradation is initiated by ˙O2 derived from dye photosensitization and h+ from the BiOBr. Cyclic experiments also indicate that the SiO2@PDA-2@BiOBr is reusable during the photodegradation process. The hierarchical core–shell SiO2@PDA@BiOBr photocatalyst will provide a theoretical model for the development of physical chemistry and structural properties of BiOBr-based composites to enhance the photocatalytic performances.

Graphical abstract: Hierarchical core–shell SiO2@PDA@BiOBr microspheres with enhanced visible-light-driven photocatalytic performance

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Publication details

The article was received on 30 Apr 2017, accepted on 04 Aug 2017 and first published on 07 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT01581J
Citation: Dalton Trans., 2017,46, 11451-11458
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    Hierarchical core–shell SiO2@PDA@BiOBr microspheres with enhanced visible-light-driven photocatalytic performance

    S. Zhu, Q. Qi, W. Zhao, M. Wu, Y. Fang, K. Tao, F. Yi and L. Han, Dalton Trans., 2017, 46, 11451
    DOI: 10.1039/C7DT01581J

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