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Issue 16, 2017
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2D/2D heterojunctions of WO3 nanosheet/K+Ca2Nb3O10 ultrathin nanosheet with improved charge separation efficiency for significantly boosting photocatalysis

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Abstract

Harvesting solar energy using semiconductor photocatalysts for wastewater decontamination offers a greener solution to address serious environmental crises. Delamination of layer photocatalysts into ultrathin two-dimensional (2D) nanosheets has induced fascinating properties such as electronic/protonic-conductivity and photocatalytic and fluorescent properties. K+Ca2Nb3O10 is one prominent type of such materials, which is derived from the Dion–Jacobsen phase KCa2Nb3O10 by exfoliation. Here, a Z-scheme WO3/K+Ca2Nb3O10 binary 2D–2D heterojunction photocatalyst is successfully constructed through an easy hydrothermal coassembly method at room temperature. The as-synthesized WO3/K+Ca2Nb3O10 photocatalyst exhibited remarkable improvement in the photodegradation performance of tetracycline hydrochloride under simulated sunlight irradiation as compared to pristine WO3 and K+Ca2Nb3O10 nanosheets. Sample 20%-WO3/K+Ca2Nb3O10 exhibited optimum efficiency, which is about 5.1-fold and 2-fold higher than those of WO3 and K+Ca2Nb3O10, respectively. Such an improvement is mainly related to its strongly coupled heterointerfaces, enlarged specific surface area and improved charge carrier separation and transfer. Radical capturing experiments and the spin-trapping ESR technique demonstrate that both ˙O2 and h+ are the important active species responsible for the tetracycline hydrochloride degradation process over the nanosheet heterojunctions.

Graphical abstract: 2D/2D heterojunctions of WO3 nanosheet/K+Ca2Nb3O10− ultrathin nanosheet with improved charge separation efficiency for significantly boosting photocatalysis

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Publication details

The article was received on 16 May 2017, accepted on 22 Jun 2017 and first published on 22 Jun 2017


Article type: Paper
DOI: 10.1039/C7CY00976C
Citation: Catal. Sci. Technol., 2017,7, 3481-3491
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    2D/2D heterojunctions of WO3 nanosheet/K+Ca2Nb3O10 ultrathin nanosheet with improved charge separation efficiency for significantly boosting photocatalysis

    X. Ma, D. Jiang, P. Xiao, Y. Jin, S. Meng and M. Chen, Catal. Sci. Technol., 2017, 7, 3481
    DOI: 10.1039/C7CY00976C

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