Construction of N-doped TiO2/MoS2 heterojunction with synergistic effect for enhanced visible photodegradation activity

Journal Article · Sat Sep 15 00:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.04.046· OSTI ID:22805179

Tang, Xinde; Wang, Zhengrong; Huang, Wei; Jing, Quanwei; Liu, Ning ^[1]

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1. Department of Materials and Chemical Engineering, Hunan Institute of Technology, Hengyang 421002 (China)

Highlights: • An N-doped TiO{sub 2}/MoS{sub 2} heterojunction is successfully synthesized by a hydrothermal method. • N-doped TiO{sub 2}/MoS{sub 2} heterojunction photocatalyst exhibits enhanced visible photodegradation activity. • The synergistic effect is between N-doping and coupling with MoS{sub 2}. • Superoxide radicals (O{sub 2}{sup −}) and photogenerated holes (h{sup +}) are chiefly responsible for the degradation process. - Abstract: An N-doped TiO{sub 2}/MoS{sub 2} heterojunction photocatalyst constructed by two-dimension MoS{sub 2} nanosheets and N-doped TiO{sub 2} nanoparticles was successfully synthesized by a hydrothermal method. The synthesized N-TiO{sub 2}/MoS{sub 2} composites were characterized by XRD, XPS, TEM, UV–vis DRS and PL, and its visible photocatalytic activity was evaluated by degradation of methylene blue. The results showed that N-doped TiO{sub 2}/MoS{sub 2} heterojunction photocatalyst achieved more enhanced photocatalytic activity compared with pure TiO{sub 2}, MoS{sub 2} and N-doped TiO{sub 2} for degradation of MB. Trapping tests with different scavengers indicated that not hydroxyl radicals (OH) but superoxide radicals (O{sub 2}{sup −}) and photogenerated holes (h{sup +}) were highly responsible for the degradation process. The reusable experiments showed that the prepared N-doped TiO{sub 2}/MoS{sub 2} heterojunction photocatalyst was stable during the photodegradation of MB and will have practical applications for environmental remediation.

• OSTI ID: 22805179
• Journal Information: Materials Research Bulletin, Vol. 105; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DOPED MATERIALS
HETEROJUNCTIONS
HOLES
HYDROTHERMAL SYNTHESIS
HYDROXYL RADICALS
METHYLENE BLUE
MOLYBDENUM SULFIDES
NANOSTRUCTURES
NITROGEN
PHOTOCATALYSIS
REMEDIAL ACTION
SHEETS
SUPEROXIDE RADICALS
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY