Facile fabrication of fibrous Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 with enhanced photocatalytic activities towards pollutant
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Facile fabrication of fibrous Bi4Ti3O12/Bi2S3/MoS2 with enhanced photocatalytic activities towards pollutant degradation under visible light irradiation Jun Liu1,* , Qian Hui1, Meng-Jie Chang1,*, Wen-Na Cui1, Tong Xi1, Lin-Da Wang1, Meng Sun1, Bin Yuan1, and Fu-Rong Ni1 1
Department of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Received: 11 February 2020
ABSTRACT
Accepted: 21 August 2020
Herein, novel fibrous Bi4Ti3O12/Bi2S3/MoS2 is constructed by a simple one-step methodology for photocatalytic degradation of RhB dyes. Bi4Ti3O12/Bi2S3/MoS2 hybrid fibers were facilely prepared by direct hydrothermal growth of MoS2 nanosheets on electrospun Bi4Ti3O12 nanofiber surface, during which rod-like Bi2S3 was formed by in-situ ion exchange reaction between BTO and S source. The MoS2 nanosheets with several-layer thickness uniformly are coated both on the BTO and Bi2S3 surface. Remarkable enhancement of visible light absorption and photo-generated charge separation in Bi4Ti3O12/Bi2S3/MoS2 are achieved compared with the bare BTO nanofibers. By changing the weight ratio of Mo/S and the precursor dosage of MoS2, the optimized BM-150/250 sample presents 2.3 and 4.1 times higher of the photodegradation efficiency and apparent reaction rate constant, respectively, than that of pure BTO fibers after 120-min irradiation under visible light. The system pays an efficient pathway to establish ternary composite fibers providing high photocatalytic activity for other electrospun Bi-contained nanofibers.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Bismuth (Bi)-contained nanomaterials such as Bi4Ti3O12, BiVO4, Bi2MoO6, and BiOX (X = Cl, Br, I) et al. have been proposed as promising visible light photocatalysts to utilize solar energy to address environmental pollutions [1–5]. In particular, bismuth titanate (Bi4Ti3O12, BTO)-nanostructured
photocatalysts have been synthesized through a variety of methods, such as chemical solution decomposition, hydrothermal synthesis, and moltensalt growth method [6–9]. However, the single BTO nanomaterial suffers from narrow visible light absorption and low hole–electron separation efficiency, resulting in low photocatalytic activities. Therefore, a large number of methods have been
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https://doi.org/10.1007/s10854-020-04324-4
J Mater Sci: Mater Electron
developed to successfully construct BTO composites to improve the photocatalytic performance, for example, modification by plasmon noble metal nanoparticles [10–12] and doping with other metal elements [13–15]. Moreover, forming p–n heterojunction by coupling BTO with another semiconductor material is an effective method to improve its photocatalytic activities. Up to date, BTO has been conjugated with various semiconductor materials, such as TiO2 [16], g-C3N4 [17], Bi2O3 [18], CeO2 [19], and AgCl/Ag [20]. In these heterojunctions, the charge carrier can transfer throug
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