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Formation of three-dimensionally ordered macroporous TiO2@nanosheet SnS2 heterojunctions for exceptional visible-light driven photocatalytic activity

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Abstract

In this paper, a simple colloidal crystal-templating method assisted by a hydrothermal process has been proposed to prepare novel three-dimensionally ordered macroporous (3DOM) TiO2@nanosheet SnS2 heterojunction photocatalysts. The photoactivities of all the obtained samples were measured by the photodecomposition of rhodamine B (RhB), the photoreduction of Cr(VI) and photocatalytic hydrogen generation from water splitting. In comparison with pure SnS2 nanosheets and 3DOM TiO2, the 3DOM TiO2@SnS2 sample with a Sn/Ti molar ratio of 7.5 : 100 showed the highest photocatalytic activity for wastewater purification (kapp for RhB solution = 0.035 min−1 and for Cr6+ solution = 0.0845 min−1) and hydrogen generation under visible light irradiation. By means of ultraviolet-visible diffuse reflectance spectra (UV-vis DRS), photoluminescence (PL) spectra, transient photocurrent spectra, electron paramagnetic resonance (EPR) measurements and photocatalytic experiments, a suggested mechanism for the charge generation and transfer in the 3DOM TiO2@nanosheet SnS2 heterojunction was proposed. The improved charge separation and enhanced photocatalytic activity for the as-prepared TiO2@SnS2 composition can be attributed to the well-defined 3DOM heterojunction structure and the spatial transfer of the visible-light excited high energy electrons of SnS2 to TiO2. This work will provide a novel route to prepare highly active heterojunction photocatalysts and a new insight into the study of electron migration paths in TiO2@SnS2 composites.

Graphical abstract: Formation of three-dimensionally ordered macroporous TiO2@nanosheet SnS2 heterojunctions for exceptional visible-light driven photocatalytic activity

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Publication details

The article was received on 03 May 2017, accepted on 06 Jul 2017 and first published on 06 Jul 2017


Article type: Paper
DOI: 10.1039/C7NJ01421J
Citation: New J. Chem., 2017, Advance Article
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    Formation of three-dimensionally ordered macroporous TiO2@nanosheet SnS2 heterojunctions for exceptional visible-light driven photocatalytic activity

    X. Yan, K. Ye, T. Zhang, C. Xue, D. Zhang, C. Ma, J. Wei and G. Yang, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ01421J

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