Abstract
S-doped Bi2MoO6 nanosheets were successfully synthesized by a simple hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), N2 adsorption–desorption isotherms, Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), elemental mapping spectroscopy, photoluminescence spectra (PL), X-ray photoelectron spectroscopy (XPS), and UV-visible diffused reflectance spectra (UV-vis DRS). The photo-electrochemical performance of the samples was investigated via an electrochemical workstation. The S-doped Bi2MoO6 nanosheets exhibited enhanced photocatalytic activity under visible light irradiation. The photo-degradation rate of Rhodamine B (RhB) by S-doped Bi2MoO6 (1 wt%) reached 97% after 60 min, which was higher than that of the pure Bi2MoO6 and other S-doped products. The degradation rate of the recovered S-doped Bi2MoO6 (1 wt%) was still nearly 90% in the third cycle, indicating an excellent stability of the catalyst. The radical-capture experiments confirmed that superoxide radicals (·O2−) and holes (h+) were the main active substances in the photocatalytic degradation of RhB by S-doped Bi2MoO6.
Highlights
With the rapid development of textile, metallurgical, chemical, and other industries, the discharge of industrial wastewater such as organic wastewater and dye wastewater has gradually increased
More semiconductor photocatalysts have been found to be capable of photocatalytic degradation of organic macromolecular contaminants in wastewater [2,3]
S-doped Bi2MoO6 nanosheets were prepared by a simple hydrothermal method
Summary
With the rapid development of textile, metallurgical, chemical, and other industries, the discharge of industrial wastewater such as organic wastewater and dye wastewater has gradually increased. Researchers have improved the performance of Bi2MoO6 by means of morphology controlling, semiconductor compounding, and doping modification [10] Among these measures, doping has proven to be an effective method to ameliorate the surface properties of photocatalysts and enhance photocatalytic performance. It was found that B-doping increases the amount of Bi5+ and oxygen vacancies, so that the visible light absorption of catalyst is stronger, and the band gap energy is lower, which significantly improves the photocatalytic activity of Bi2MoO6. Density functional theory calculations and systematical characterization results revealed that Bi self-doping could promote the separation and transfer of photogenerated electron-hole pairs of Bi2MoO6 and alter the position of valence and conduction band without changing its preferential crystal orientations, morphology, visible light absorption, as well as band gap energy [17].
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