Synthesis of Cd1-xZnxS/K4Nb6O17 Composite and its Photocatalytic Activity for Hydrogen Production

Bulletin of the Korean chemical society

Yinghua Liang¹  Li Liu¹  Wenquan Cui¹  Jinshan Hu¹  Meiyi Shao¹ 

关键词: Cd0.8Zn0.2S/K4Nb6O17;    Photocatalysis;    Hydrogen evolution;    Precipitation;    Nanomaterials;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Cd1-xZnxS-sensitized K4Nb6O17 composite photocatalysts (designated Cd1-xZnxS/K4Nb6O17) were prepared via a simple deposition-precipitation method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDS), N2 sorption, ultraviolet–visible light diffuse reflectance spectroscopy (UV–Vis DRS), photoluminescence measurements (PL), and X-ray photoelectron spectroscopy (XPS). The Cd0.8Zn0.2S particles were scattered on the surface of K4Nb6O17, and had a relatively uniform size distribution around 50 nm. The absorption edge of K4Nb6O17 was shifted to the visible light region and the recombination of photo-generated electrons and holes suppressed after Cd0.8Zn0.2S loading. The Cd0.8Zn0.2S(25 wt %)/K4Nb6O17 composite possessed the highest photocatalytic activity for hydrogen production under visible light irradiation, evolving 8.278 mmol/g in 3 h. Recyclability tests were performed, and the composite photocatalysts were found to be fairly stable. The mechanism of charge separation between the photogenerated electrons and holes at the Cd0.8Zn0.2S/K4Nb6O17 composite was discussed.

【 授权许可】

Unknown