Double Z-scheme system of silver [email protected] tungstate/tungsten trioxide ternary heterojunction with enhanced visible-light photocatalytic activity

Add time:08/11/2019    Source:sciencedirect.com

The ternary heterojunction of silver [email protected] tungstate/tungsten trioxide ([email protected]2WO6/WO3) 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 Bi2WO6/WO3 or AgBr alone, the [email protected]2WO6/WO3 composites displayed higher visible-light photocatalytic performance for degrading rhodamine B (RhB). [email protected]2WO6/WO3 with 40% AgBr concentration was optimum for photocatalytic activity. Radical-trapping experiments revealed that superoxide anion radicals (O2−) and holes (h+) were the active species during photocatalytic degradation and that O2− was the dominant active species. Therefore, the increased photocatalytic activity of [email protected]2WO6/WO3 was attributed to the atypical double Z-scheme system, which effectively improved the transfer and separation of electron–hole pairs in ternary heterojunction structures.

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