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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

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Front. Mater. Sci.    2021, Vol. 15 Issue (2) : 241-252    https://doi.org/10.1007/s11706-021-0548-6
RESEARCH ARTICLE
Construction of ternary heterojunction AgI/C--MoS2 nanosheets with enhanced visible-light photocatalytic property and self-cleaning performance
Yan DU, Ziwen NIU, Tingjiang YAN, Kunlei ZHU, Yang YU, Zhihong JING()
School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
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Abstract

Carbon–molybdenum disulfide (C–MoS2) ultrathin nanosheets were prepared by a hydrothermal process, and then AgI/C–MoS2 were synthesized via an in-situ deposition method. This ternary heterojunction composite exhibited better photocatalytic activity compared with those of one-component (pristine MoS2) and bi-component (AgI/MoS2 and C–MoS2) materials for the degradation of organic dyes under the visible-light irradiation. In particular, by comparing with AgI/MoS2, the significant role of conductive amorphous carbon in AgI/C–MoS2 in enhancing the charge transfer during the photocatalytic degradation of dyes was first confirmed by photocurrent response and electrochemical impedance spectroscopy (EIS). A possible photocatalytic mechanism was proposed based on the capture experiment results. Furthermore, a straightforward and interesting way had been applied to test the recycled/newly-prepared AgI/C–MoS2 composite for revealing its distinctive self-cleaning performance and recyclability characteristic besides its good photocatalytic activity. This work could provide a reference for the design of other new ternary heterojunction composite materials with special structures and properties.
Keywords AgI/C--MoS2      ternary heterojunction      in-situ deposition      hydrothermal process      photocatalytic activity      self-cleaning performance     
Corresponding Author(s): Zhihong JING   
Online First Date: 10 May 2021    Issue Date: 08 June 2021
 Cite this article:   
Yan DU,Ziwen NIU,Tingjiang YAN, et al. Construction of ternary heterojunction AgI/C--MoS2 nanosheets with enhanced visible-light photocatalytic property and self-cleaning performance[J]. Front. Mater. Sci., 2021, 15(2): 241-252.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-021-0548-6
https://academic.hep.com.cn/foms/EN/Y2021/V15/I2/241
Fig.1  XRD patterns of the samples: pristine MoS2 (a); C–MoS2 (b); AgI/C–MoS2 (c).
Fig.2  SEM images of the samples: (a) pristine MoS2; (b) C–MoS2; (c) AgI/C–MoS2. (d) Elemental mapping images of the selected individual AgI/C–MoS2 nanosheets. (e)(f) HRTEM images and (g) EDS spectrum of the AgI/C–MoS2 ternary heterojunction nanosheets.
Fig.3  Nitrogen adsorption–desorption isotherms and corresponding pore size distribution plots (inset graph) of (a) pristine MoS2, (b) C–MoS2 and (c) AgI/C–MoS2.
Fig.4  Photocatalytic activities of all samples for the degradation of RhB under visible light irradiation: (a) photocatalytic degradation curves of RhB over the samples and (b) Pseudo-first-order kinetics of time evolution of the samples (1: blank; 2: P25; 3: pristine MoS2; 4: C–MoS2; 5: AgI/MoS2; 6: AgI/C–MoS2). (c) Values of the apparent reaction rate constant (k) for different samples.
Fig.5  Spectroscopic plots of the samples: (a) UV–vis spectra; (b) fluorescence spectra.
Fig.6  DRS results of as-fabricated samples (1: AgI/C–MoS2; 2: AgI/MoS2; 3: C–MoS2; 4: pristine MoS2; 5: AgI).
Fig.7  Effects of scavengers on the degradation RhB of AgI/C–MoS2.
Fig.8  The proposed mechanism that heterojunction photocatalyst enhances the visible-light photodegradation activity to the degradation of RhB.
Fig.9  XRD patterns of as-prepared AgI/C–MoS2 before and after the degradation of RhB.
Fig.10  (a) Transient photocurrent responses of C–MoS2, AgI/MoS2 and AgI/C–MoS2. (b) Electrochemical impedance spectroscopy results of AgI/MoS2 and AgI/C–MoS2.
Fig.11  Schematic diagram of optical images of the contact angle and color changes at different times of mixture droplets on the surface of the glass substrate.
  Fig. S1 Graphs of AgI/C?MoS2 for the degradation of organic dyes (MB, CR and RhB): (a) photocatalytic degradation curves; (b) pseudo-first-order kinetics of time evolution as well as the corresponding apparent reaction rate constant (k).
  Fig. S2 Recycle curves of the AgI/C?MoS2 nano-heterojunction for the degradation of RhB.
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[1] Xiaojun NIU, Jinling MA. Fabrication of Ag3PO4–AgBr–PTh composite loaded on Na2SiO3 with enhanced visible-light photocatalytic activity[J]. Front. Mater. Sci., 2018, 12(3): 264-272.
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