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Enhancement of Z-scheme behavior by coupling local WO3−x–WS2 with Au nanoparticles for efficient photoelectrochemical degradation of methylene blue
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DOI：10.1039/D5CY01071C.png)
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Abstract
En 中文
The removal of water pollutants has become the foremost priority in environmental remediation. To overcome this issue; photoelectrochemical (PEC) organic-dye degradation is preferred as it meets the demands of sustainability and eco-friendliness. For efficiently harvesting solar energy and facilitating carrier migration; semiconductors with appropriate band gaps; high light absorption capacity; and favorable reaction kinetics have been explored to drive PEC organic-dye conversion. In this work; we prepared a WO3−x–WS2 heterostructure embedded with Au nanoparticles by hydrothermal and photodeposition strategies. The optimal WO3−x@Au–WS2 ternary catalyst achieved the removal of 98.52% methylene blue in a neutral aqueous solution within 60 min under visible light; which was 1.7 times higher than that of bare WO3−x. In the WO3−x@Au–WS2 ternary heterostructure; a Z-scheme of electron transfer paths was formed to promote the migration of photogenerated carriers. Our study offers new insights into the catalytic mechanism of ternary heterostructures; providing a promising strategy for improving the efficiency of wastewater treatment.
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