Next Article in Journal
Tuning the Magnetic Moment of Small Late 3d-Transition-Metal Oxide Clusters by Selectively Mixing the Transition-Metal Constituents
Previous Article in Journal
Characterization of Commercial Metal Oxide Nanomaterials: Crystalline Phase, Particle Size and Specific Surface Area
Open AccessArticle

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Key Laboratory of Fine Chemicals in Universities of Shandong, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(9), 1813; https://doi.org/10.3390/nano10091813
Received: 9 August 2020 / Revised: 3 September 2020 / Accepted: 8 September 2020 / Published: 11 September 2020
Exploiting excellent photocatalytic activity and stable heterostructure composites are of critical importance for environmental sustainability. The spherical Bi2WO6/Bi2S3/MoS2 n-p heterojunction is first prepared via an in situ hydrothermal method using Bi2WO6, Na2MoO4·2H2O, and CH4N2S, in which the intermediate phase Bi2S3 is formed due to chemical coupling interaction of Bi2WO6 and CH4N2S. Scanning electron microscopy indicates that the compactness of the sample can be easily adjusted by changing the contents of S and Mo sources in the solution. The results of ultraviolet–visible (UV–vis) diffuse reflectance spectra, photoluminescence, transient photocurrent response, and electrochemical impedance spectra indicate that the formation of heterojunctions contributes to enhancing visible-light utilization and promoting photogenerated carrier separation and transfer. The composite material is used as a catalyst for the visible light photocatalytic reduction of Cr(VI). Remarkably, the optimal Bi2WO6/Bi2S3/MoS2 n-p heterojunction achieves the greatest Cr(VI) reduction rate of 100% within 75 min (λ > 420 nm, pH = 2); this rate is considerably better than the Cr(VI) reduction rate of pure Bi2WO6. The recycling experiment also reveals that the photocatalytic performance of the n-p heterojunction toward Cr(VI) is still maintained at 80% after three cycles, indicating that the n-p heterojunction has excellent structural stability. The capture experiment proves that the main active species in the system are electrons. The reasonable mechanism of Bi2WO6/Bi2S3/MoS2 photocatalytic reduction Cr(VI) is proposed. Our work provides new research ideas for the design of ternary heterojunction composites and new strategies for the development of photocatalysts for wastewater treatment. View Full-Text
Keywords: n-p heterojunction; Bi2WO6/Bi2S3/MoS2; Visible-light; Photocatalytic reduction; Cr(VI) n-p heterojunction; Bi2WO6/Bi2S3/MoS2; Visible-light; Photocatalytic reduction; Cr(VI)
Show Figures

Graphical abstract

MDPI and ACS Style

Ren, J.; Hu, T.; Gong, Q.; Wang, Q.; Sun, B.; Gao, T.; Cao, P.; Zhou, G. Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity. Nanomaterials 2020, 10, 1813. https://doi.org/10.3390/nano10091813

AMA Style

Ren J, Hu T, Gong Q, Wang Q, Sun B, Gao T, Cao P, Zhou G. Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity. Nanomaterials. 2020; 10(9):1813. https://doi.org/10.3390/nano10091813

Chicago/Turabian Style

Ren, Jing; Hu, Tingting; Gong, Qinghua; Wang, Qian; Sun, Bin; Gao, Tingting; Cao, Pei; Zhou, Guowei. 2020. "Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity" Nanomaterials 10, no. 9: 1813. https://doi.org/10.3390/nano10091813

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop