JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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In-situ synthesis of novel Z-scheme SnS(2)/BiOBr photocatalysts with superior photocatalytic efficiency under visible light.

In this study, a novel SnS2 /BiOBr heterojunction photocatalyst was synthesized via a facile in-situ growth strategy. The heterojunction interface was formed by loading BiOBr nanosheets on the surface of ultrathin hexagonal SnS2 nanoplates. UV/Vis diffuse reflectance spectroscopy (DRS) indicated that SnS2 /BiOBr composites possessed stronger visible-light absorption. The as-fabricated SnS2 /BiOBr heterojunction nanoplates exhibited considerable improvement in terms of photocatalytic activity for the degradation of rhodamine B (RhB) under visible light irradiation as compared with BiOBr and SnS2 . The enhanced photocatalytic activity was attributed to the closely contacted interface between BiOBr and SnS2 , thereby resulting in faster transfer of the photoinduced electron-hole pairs through their interface, as shown by the results of photoluminescence spectroscopy (PL) and photocurrent measurements. Radical trapping experiments demonstrated that holes (h+ ) and superoxide anion radicals (O2 - ) were the main active species in the photocatalytic oxidation process. The mechanism of the excellent photocatalytic activity of SnS2 /BiOBr heterojunction composite was also discussed.

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