光降解
X射线光电子能谱
异质结
罗丹明B
光电流
光致发光
材料科学
半导体
傅里叶变换红外光谱
介电谱
量子效率
化学
化学工程
光催化
光化学
光电子学
电化学
有机化学
催化作用
工程类
物理化学
电极
作者
Xiaofei Qu,Zhaoqun Gao,Xiaohui Zhao,Liang Shi,Fanglin Du,Hongbing Song
标识
DOI:10.1016/j.apsusc.2020.147248
摘要
Bi4NbO8Cl is a novel bismuth-based catalyst with a 2D sheet structure for photodegradation under visible light irradiation. However, Bi4NbO8Cl semiconductor has low quantum efficiency, as well as the photogenerated electrons (e-) and holes (h+) tend to recombine in a single semiconductor, thereby decreasing their degradation efficiency. Hence, in this work, Bi2O3/Bi4NbO8Cl 0D/2D heterojunctions containing Bi2O3 quantum dots were prepared to enhance the photocatalytic performance, in which e- and h+ were separated and transferred to different semiconductors for oxidation and reduction, respectively. Compared to bare Bi4NbO8Cl, the photocatalytic activity of 0.5 Bi2O3/Bi4NbO8Cl increases by 2.6 times in the degradation of Rhodamine B since the formation of heterojunctions. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR) has confirmed the formation of heterojunction. The photoluminescence (PL), photocurrent, and electrochemical impedance spectra (EIS) tests indicate that the quantum efficiency has been improved. This research may be valuable for the industrial application of photocatalysts and provide a new idea for designing photocatalysts.
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