Double Z-scheme system of silver bromide@bismuth tungstate/tungsten trioxide ternary heterojunction with enhanced visible-light photocatalytic activity.

Author(s) Zhang, M.; Zhu, Y.; Li, W.; Wang, F.; Li, H.; Liu, X.; Zhang, W.; Ren, C.
Journal J Colloid Interface Sci
Date Published 2018 Jan 01

The ternary heterojunction of silver bromide@bismuth tungstate/tungsten trioxide (AgBr@BiWO/WO) was designed and synthesised by hydrothermal and deposition-precipitation approaches. The composites were characterised by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy (XPS). The photoabsorption range and bandgaps of the photocatalysts were analysed by ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). Compared with BiWO/WO or AgBr alone, the AgBr@BiWO/WO composites displayed higher visible-light photocatalytic performance for degrading rhodamine B (RhB). AgBr@BiWO/WO with 40% AgBr concentration was optimum for photocatalytic activity. Radical-trapping experiments revealed that superoxide anion radicals (O) and holes (h) were the active species during photocatalytic degradation and that O was the dominant active species. Therefore, the increased photocatalytic activity of AgBr@BiWO/WO was attributed to the atypical double Z-scheme system, which effectively improved the transfer and separation of electron-hole pairs in ternary heterojunction structures.

DOI 10.1016/j.jcis.2017.08.095
ISSN 1095-7103
Citation J Colloid Interface Sci. 2018;509:1824.

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