Abstract A Bi2WO6-based hybrid heterostructure photocatalyst were fabricated by two step hydrothermal method. Bi2WO6 nanosheets with side length of 100–200 nm and thickness and about 20 nm thickness was homogeneously overcoated at the surface of CdS nanowires with an average diameter of 50 nm. The formation of hybrid heterostructures could efficiently enhanced the photocatalytic activity. The hybrid heterostructures photocatalyst of Bi2WO6/CdS achieved the highest photocatalytic H2 evolution (1223 μmol h−1g−1) under visible light irradiation which is much higher than the pristine CdS (602 μmol h−1g−1). Furthermore, the photocatalytic pollutant decomposition efficiency of hybrid heterostructures was well promoted compare to Bi2WO6 and CdS. The role of main oxidative species in the photocatalytic process was confirmed by the active species trapping experiments. The experimental results concluded that the enhanced photocatalytic activity and photostability of hybrid heterostructures is mainly associated with the Z-scheme photocatalytic charge transfer of the photogenerated charge carriers. Based on the obtained experimental results and calculation, a precise Z-scheme mechanism was proposed and discussed, which was further evaluated by the electrochemical spectroscopic study of the prepared photocatalyst. The Z-scheme photocatalytic system bestows the Bi2WO6/CdS hybrid heterostructures with efficient reducibility, stability and excellent oxidizability.

中文翻译：

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通过Z-scheme工艺增强光分解和光催化析氢的Bi2WO6基杂化异质结构光催化剂

摘要 采用两步水热法制备了Bi2WO6基杂化异质结构光催化剂。Bi2WO6 纳米片的边长为 100-200 nm，厚度约为 20 nm，均匀覆盖在平均直径为 50 nm 的 CdS 纳米线表面。杂化异质结构的形成可以有效地提高光催化活性。Bi2WO6/CdS 混合异质结构光催化剂在可见光照射下实现了最高的光催化 H2 释放（1223 μmol h-1g-1），远高于原始 CdS（602 μmol h-1g-1）。此外，与 Bi2WO6 和 CdS 相比，混合异质结构的光催化污染物分解效率得到了很好的提升。活性物质捕获实验证实了主要氧化物质在光催化过程中的作用。实验结果表明，杂化异质结构增强的光催化活性和光稳定性主要与光生载流子的 Z 型光催化电荷转移有关。基于获得的实验结果和计算，提出并讨论了精确的Z-scheme机理，并通过制备的光催化剂的电化学光谱研究进一步评估。Z 型光催化体系赋予 Bi2WO6/CdS 杂化异质结构高效的还原性、稳定性和优异的氧化性。实验结果表明，杂化异质结构增强的光催化活性和光稳定性主要与光生载流子的 Z 型光催化电荷转移有关。基于获得的实验结果和计算，提出并讨论了精确的Z-scheme机理，并通过制备的光催化剂的电化学光谱研究进一步评估。Z 型光催化体系赋予 Bi2WO6/CdS 杂化异质结构高效的还原性、稳定性和优异的氧化性。实验结果表明，杂化异质结构增强的光催化活性和光稳定性主要与光生载流子的 Z 型光催化电荷转移有关。基于获得的实验结果和计算，提出并讨论了精确的Z-scheme机理，并通过制备的光催化剂的电化学光谱研究进一步评估。Z 型光催化体系赋予 Bi2WO6/CdS 杂化异质结构高效的还原性、稳定性和优异的氧化性。通过对制备的光催化剂的电化学光谱研究进一步评估。Z 型光催化体系赋予 Bi2WO6/CdS 杂化异质结构高效的还原性、稳定性和优异的氧化性。通过对制备的光催化剂的电化学光谱研究进一步评估。Z 型光催化体系赋予 Bi2WO6/CdS 杂化异质结构高效的还原性、稳定性和优异的氧化性。