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Title: Enhancing visible light photocatalytic activity of direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts

Abstract

Highlights: • Novel direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts are synthesized. • SnS{sub 2}/Ag{sub 3}PO{sub 4} exhibits much higher photocatalytic activity than pure SnS{sub 2} and Ag{sub 3}PO{sub 4}. • A possible photocatalytic mechanism was discussed in detail. - Abstract: Novel direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts were successfully fabricated with SnS{sub 2} nanoplates hybridized by Ag{sub 3}PO{sub 4} nanoparticals via a facile hydrothermal and precipitation method and applied for the photocatalytic degradation of methyl orange in aqueous solution under visible light irradiation (λ > 420 nm). It was found that the photocatalytic performance of the SnS{sub 2} (2.0 wt%)/Ag{sub 3}PO{sub 4} heterojunction photocatalyst with 2.0 wt% SnS{sub 2} content was much higher than that of individual SnS{sub 2} and Ag{sub 3}PO{sub 4}. The enhanced photocatalytic activity could be ascribed to the efficient separation of photogenerated electrons and holes through the formation of direct Z-scheme system composed of SnS{sub 2} and Ag{sub 3}PO{sub 4}. Furthermore, the recycling experiments revealed that the photocorrosion behavior of Ag{sub 3}PO{sub 4} was strongly inhibited by SnS{sub 2}, it may be due to the photogenerated electrons of Ag{sub 3}PO{sub 4} would be quickly combined with the photogenerated holes of SnS{sub 2}.more » This work will be useful for the design of other direct Z-scheme visible-light-driven photocatalytic systems for application in energy conversion and environmental remediation.« less

Authors:
; ; ; ; ; ;
Publication Date:
OSTI Identifier:
22581615
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 81; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AQUEOUS SOLUTIONS; DESIGN; ELECTRONS; ENERGY CONVERSION; HETEROJUNCTIONS; HOLES; IRRADIATION; METHYL ORANGE; OPTICAL PROPERTIES; PHOTOCATALYSIS; PRECIPITATION; RECYCLING; REMEDIAL ACTION; SEMICONDUCTOR MATERIALS; SILVER PHOSPHATES; SYNTHESIS; TIN SULFIDES; VISIBLE RADIATION

Citation Formats

Luo, Jin, E-mail: lj328520504@126.com, Zhou, Xiaosong, Ma, Lin, Xu, Limei, Xu, Xuyao, Du, Zhihua, and Zhang, Jinquan. Enhancing visible light photocatalytic activity of direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts. United States: N. p., 2016. Web. doi:10.1016/J.MATERRESBULL.2016.04.028.
Luo, Jin, E-mail: lj328520504@126.com, Zhou, Xiaosong, Ma, Lin, Xu, Limei, Xu, Xuyao, Du, Zhihua, & Zhang, Jinquan. Enhancing visible light photocatalytic activity of direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts. United States. doi:10.1016/J.MATERRESBULL.2016.04.028.
Luo, Jin, E-mail: lj328520504@126.com, Zhou, Xiaosong, Ma, Lin, Xu, Limei, Xu, Xuyao, Du, Zhihua, and Zhang, Jinquan. 2016. "Enhancing visible light photocatalytic activity of direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts". United States. doi:10.1016/J.MATERRESBULL.2016.04.028.
@article{osti_22581615,
title = {Enhancing visible light photocatalytic activity of direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts},
author = {Luo, Jin, E-mail: lj328520504@126.com and Zhou, Xiaosong and Ma, Lin and Xu, Limei and Xu, Xuyao and Du, Zhihua and Zhang, Jinquan},
abstractNote = {Highlights: • Novel direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts are synthesized. • SnS{sub 2}/Ag{sub 3}PO{sub 4} exhibits much higher photocatalytic activity than pure SnS{sub 2} and Ag{sub 3}PO{sub 4}. • A possible photocatalytic mechanism was discussed in detail. - Abstract: Novel direct Z-scheme SnS{sub 2}/Ag{sub 3}PO{sub 4} heterojunction photocatalysts were successfully fabricated with SnS{sub 2} nanoplates hybridized by Ag{sub 3}PO{sub 4} nanoparticals via a facile hydrothermal and precipitation method and applied for the photocatalytic degradation of methyl orange in aqueous solution under visible light irradiation (λ > 420 nm). It was found that the photocatalytic performance of the SnS{sub 2} (2.0 wt%)/Ag{sub 3}PO{sub 4} heterojunction photocatalyst with 2.0 wt% SnS{sub 2} content was much higher than that of individual SnS{sub 2} and Ag{sub 3}PO{sub 4}. The enhanced photocatalytic activity could be ascribed to the efficient separation of photogenerated electrons and holes through the formation of direct Z-scheme system composed of SnS{sub 2} and Ag{sub 3}PO{sub 4}. Furthermore, the recycling experiments revealed that the photocorrosion behavior of Ag{sub 3}PO{sub 4} was strongly inhibited by SnS{sub 2}, it may be due to the photogenerated electrons of Ag{sub 3}PO{sub 4} would be quickly combined with the photogenerated holes of SnS{sub 2}. This work will be useful for the design of other direct Z-scheme visible-light-driven photocatalytic systems for application in energy conversion and environmental remediation.},
doi = {10.1016/J.MATERRESBULL.2016.04.028},
journal = {Materials Research Bulletin},
number = ,
volume = 81,
place = {United States},
year = 2016,
month = 9
}
  • The Bi{sub 2}O{sub 3}/Bi{sub 2}WO{sub 6} heterojunction photocatalysts were prepared by a two-step solvothermal process using Bi(NO{sub 3}){sub 3}-ethylene glycol solution as Bi source. The catalysts were characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse reflection spectroscopy. The heterostructure catalysts are composed of Bi{sub 2}O{sub 3} nanoparticles as modifier and 3D Bi{sub 2}WO{sub 6} microspheres as substrate. Bi{sub 2}O{sub 3} nanoparticles with diameters of about 10-15 nm are tightly grown on the lateral surface of the Bi{sub 2}WO{sub 6} microspheres. The hierarchical Bi{sub 2}O{sub 3}/Bi{sub 2}WO{sub 6} microspheres exhibit higher photocatalytic activity thanmore » the single phase Bi{sub 2}WO{sub 6} or Bi{sub 2}O{sub 3} for the degradation of rhodamine B under visible light illumination ({lambda}>420 nm). The enhancement of the photocatalytic activity of the Bi{sub 2}O{sub 3}/Bi{sub 2}WO{sub 6} heterojunction catalysts can be ascribed to their improved light absorption property and the reduced recombination of the photoexcited electrons and holes during the photocatalytic reaction. The effect of loading amount of Bi{sub 2}O{sub 3} on the catalytic performance of the heterojunction catalysts was also investigated and the optimal content of Bi{sub 2}O{sub 3} is 3 wt%. The Bi{sub 2}O{sub 3}/Bi{sub 2}WO{sub 6} heterojunction photocatalysts are essentially stable during the photocatalytic process. - Graphical abstract: The Bi{sub 2}O{sub 3}/Bi{sub 2}WO{sub 6} heterojunction catalysts were constructured with improved photocatalytic activity, which can be ascribed to their improved light absorption property and the reduced recombination rate between photoexcited electrons and holes. Highlights: > Bi{sub 2}O{sub 3}/Bi{sub 2}WO{sub 6} heterojunction photocatalysts. > Effective separation of photoexcited electrons and holes. > High visible light photocatalytic activity.« less
  • Highlights: • Bi{sub 2}WO{sub 6}/BiVO{sub 4} heterojunction photocatalysts were obtained using hydrothermal method. • Physicochemical properties played a significant role on photocatalytic efficiency. • Bi{sub 2}WO{sub 6}/BiVO{sub 4} heterogeneous structures were greatly enhanced for degradation of MB. • A tentative mechanism of charge transfer process in MB degradation was proposed. - Abstract: The Bi{sub 2}WO{sub 6}/BiVO{sub 4} heterojunction photocatalysts were synthesized by hydrothermal method. Physical properties of the heterojunction photocatalyst samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The XRD results indicated that BiVO{sub 4} retain monoclinic and tetragonal structures, whilemore » Bi{sub 2}WO{sub 6} presented as orthorhombic structure. The Brunauer, Emmett and Teller (BET) adsorption–desorption of nitrogen gas for specific surface area determination at the temperature of liquid nitrogen was performed on all samples. UV–vis diffuse reflectance spectra (UV–vis DRS) were used to identify the absorption range and band gap energy of the heterojunction photocatalysts. The photocatalytic performance of Bi{sub 2}WO{sub 6}/BiVO{sub 4} heterojunction photocatalysts was studied via the photodegradation of methylene blue (MB) under visible light irradiation. The results indicated that the heterojunction photocatalyst at 0.5:0.5 mole ratio of Bi{sub 2}WO{sub 6}:BiVO{sub 4} shows the highest photocatalytic activity.« less
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