Synthesis and Characterization of Bi2WxMo1−xO6 Solid Solutions and Their Application in Photocatalytic Desulfurization under Visible Light

Abstract

Photocatalytic oxidative desulfurization has attracted much attention in recent years due to the continuous tightening of the sulfur content requirements in motor fuels and the disadvantages of the industrial hydrodesulfurization process. This work is devoted to the investigation of the photocatalytic activity of Bi2WxMo1−xO6 solid solutions (x = 1, 0.75, 0.5, 0.25, 0) in the oxidative desulfurization of hydrocarbons under visible light irradiation using hydrogen peroxide as an oxidant. The synthesized photocatalysts were characterized in detail using XRD, SEM, EDS, low-temperature nitrogen adsorption–desorption, and DRS. It was shown that the use of solid solutions Bi2WxMo1−xO6 with x = 0.5–0.75 leads to the complete oxidation of organosulfur compounds to CO2 and H2O within 120 min. The high photocatalytic activity of solid solutions (x = 0.5–0.75) is attributed to their ability to absorb more visible light, the presence of the corner-shared [Mo/WO6] octahedral layers, which may promote the generation and separation of photogenerated charges, and the hierarchical 3D flower-like structure. The reaction mechanism of the desulfurization was also analyzed in this work.

3-D/3-D Z-Scheme Heterojunction Composite Formed by Marimo-like Bi2WO6 and Mammillaria-like ZnO for Expeditious Sunlight Photodegradation of Dimethyl Phthalate

“…In addition, the peaks related to hexagonal ZnO and orthorhombic Bi 2 WO 6 were found in the diffraction patterns of asprepared composites, unveiling the successful formation of BWZ composites. Moreover, the crystalline size (D) of the photocatalysts can be calculated by Scherrer's formula [22,23]: D = Kλ/βcosθ, where K is the particle shape-constant (normally taken as 0.9), λ is the wavelength of X-ray, β is the full width at half maximum of diffraction peak and θ is the diffraction peak. The average crystallite size of Bi 2 WO 6 and ZnO are 34.7 nm and 18.8 nm, respectively.…”

Preparation of Two-Dimensional Layered CeO2/Bi2O3 Composites for Efficient Photocatalytic Desulfurization

“…; Zhou et al [21] prepared a Ag2O/Na-g-C3N4 heterojunction for photocatalytic desulfurization of thiophene in fuel. Belousov et al [22] synthetized nanosized Bi2WxMO1−xO6 solid solutions to degrade DBT in model fuel; Zhang et al [23] prepared a CeF3/g-C3N4 heterojunction photocatalyst with up-conversion performance for photocatalytic removal of DBT from model oil.…”

Designing a novel heterostructure AgInS2@MIL-101(Cr) photocatalyst from PET plastic waste for tetracycline degradation

“…Meanwhile, the linker can act as a light-harvesting antenna to perform a linker-to-cluster charge transition, thus preventing the recombination of the photoexcited electron–hole pairs and improving the photocatalytic performance. 19–22 For example, Aiping Liu et al 23 reported the decoration of CuInS 2 nanoparticles onto ZIF-8 MOF for the degradation of rhodamine B (RhB) under UV light irradiation. It was found that the nanocomposite exhibited better catalytic efficiency and durability than pure CuInS 2 nanoparticles.…”