The band structure and photocatalytic mechanism of MoS2-modified C3N4 photocatalysts with improved visible photocatalytic activity

Journal Article · Fri Jun 15 00:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.02.055· OSTI ID:22804027

Lan, Zijian; Yu, Yanlong; Yao, Jianghong; Cao, Yaan ^[1]

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1. Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457 (China)

Highlights: • A series of MoS{sub 2}/g-C{sub 3}N{sub 4} photocatalyst were prepared by water exfoliation method. • The heterojunction enhanced the visible response and separated charge carriers. • The MoS{sub 2}/g-C{sub 3}N{sub 4} exhibits enhanced visible photocatalytic activity. - Abstract: A series of MoS{sub 2}/g-C{sub 3}N{sub 4} photocatalysts were prepared by modifying g-C{sub 3}N{sub 4} with different concentration of MoS{sub 2} via a water exfoliation method. The crystal structure, morphology, band structure of heterojunction, behaviors of charge carries and the redox ability were characterized by XRD, HR-TEM, absorption spectra, XPS, PL, cyclic voltammetry curves and transient photocurrent spectra. It is revealed that the introduction of MoS{sub 2} on the surface of g-C{sub 3}N{sub 4} nanosheets to form micro-heterojunction could enhance the visible response and separate photogenerated charge carriers effectively. Moreover, the ability of the photocatalyst for generating reactive oxygen species (ROS, such as O{sub 2}{sup −} and OH) was also investigated. Therefore, MoS{sub 2}/g-C{sub 3}N{sub 4} samples exhibit better photocatalytic performance for the photodegradation of HCHO than g-C{sub 3}N{sub 4} and MoS{sub 2} under visible irradiation.

• OSTI ID: 22804027
• Journal Information: Materials Research Bulletin, Vol. 102; 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
ABSORPTION SPECTRA
CARBON NITRIDES
CHARGE CARRIERS
CONCENTRATION RATIO
CRYSTAL STRUCTURE
HETEROJUNCTIONS
MOLYBDENUM SULFIDES
MORPHOLOGY
OXYGEN
PHOTOCATALYSIS
PHOTOCURRENTS
TRANSMISSION ELECTRON MICROSCOPY
VOLTAMETRY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY