Enhancing Electron-hole Utilization of CdS Based on Cucurbiturils Vis Electrostatic Interaction in Visible Light
Publication date: Available online 14 November 2018
Source: Journal of Solid State Chemistry
Author(s): Qin Yang, Chunjuan Fang, Na Zhao, Ying Jiang, Bing Xu, Shouning Chai, Yuanzhen Zhou
We synthesized a novel CdS/Cucurbit[n]urils (CB[n], n=5–10) composites by a simple one-step process. The CdS/CB photo-catalyst exhibits excellent performance. In this context, CdS/CB were studied by different chemical characterization techniques including fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) techniques. FT-IR and XPS indicate that the caged carbonyl port of CB achieves substantial separation of CdS electron-holes. Furthermore, the concentration of hydroxyl radicals was monitored by fluorescence spectroscopy, which confirmed that the Cucurbit[n]urils can effectively enhance the photocatalytic reaction. We have checked the regeneration efficiency of CdS/CB, which was still at its higher value even after four cycles of recycling testing. Moreover, a reliable photocatalytic mechanism supported by fluorescent probe for degrading MB aqueous solution in the CdS/CB composite was also described. We anticipate that the study of the mechanism of temporary interaction with holes can have a great impact on photo-catalysis theory.
Schematic of charge transfer mechanism in CdS/CB composite under visible light illumination