Preparation, Characterization, and Performance Analysis of S-Doped Bi2MoO6 Nanosheets

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.

Enhanced luminescence properties of Eu3+ in La2MoO6 by nonsensitization of Bi3+

“…The wide-range XPS spectrum of LMO:0.2Eu 3+ shows the obvious peaks of La, Mo, O and C elements. 20 By comparing the XPS spectra of LMO:0.2Eu 3+ and LMO:0.2Eu 3+ , Bi 3+ , the LMO:0.2Eu 3+ , Bi 3+ has some peaks of the Bi 3+ element in the spectrum. This result indicates that Bi 3+ ions are successfully doped into the sample.…”

“…For studying the elemental composition and the oxidation state of the samples, both LMO:0.2Eu 3+ and LMO:0.2Eu 3+ , 0.6Bi 3+ samples as representatives are analyzed by XPS spectra as shown in Figure 1B‐E. The wide‐range XPS spectrum of LMO:0.2Eu 3+ shows the obvious peaks of La, Mo, O and C elements 20 . By comparing the XPS spectra of LMO:0.2Eu 3+ and LMO:0.2Eu 3+ , Bi 3+ , the LMO:0.2Eu 3+ , Bi 3+ has some peaks of the Bi 3+ element in the spectrum.…”

“…The core spectra of Bi 4f are located at 157.1 and 162.4 eV, and the peaks are, respectively, indexed to Bi 4f 5/2 and Bi 4f 7/2 with the spin‐orbit splitting energy difference of 5.3 eV, 23 which is derived from the binding energy of Bi 3+ . The photoelectron spectroscopy of Mo 3d exhibits two peaks at 230.6 and 162.4 eV corresponding to the Mo 3d 5/2 and Mo 3d 3/2 spin orbits, respectively, which originates from the oxidation state of Mo 6+ ions 20 …”

“…The photoelectron spectroscopy of Mo 3d exhibits two peaks at 230.6 and 162.4 eV corresponding to the Mo 3d 5/2 and Mo 3d 3/2 spin orbits, respectively, which originates from the oxidation state of Mo 6+ ions. 20 To further study the crystal structure, the XRD refinements are performed by GSAS with the crystal structure data of La 2 MoO 6 reported by Karin Lundborg. 24 Figure 2, Table 1 and Table 2 show the results.…”

BiOCOOH Microflowers Decorated with Ag/Ag2CrO4 Nanoparticles as Highly Efficient Photocatalyst for the Treatment of Toxic Wastewater

“…Semiconductor-mediated photocatalysis, an effective and environmental-friendly approach for environmental remediation, has attracted worldwide scientific interest [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Up to now, a large number of photocatalysts have been developed for environmental protection, including metals [17], organic polymers [18], sulfides [19,20], metal oxides [21][22][23], and nitrides [24].…”