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. 2020 Aug 27;10(53):31794-31799.
doi: 10.1039/d0ra04512h. eCollection 2020 Aug 26.

Novel MoS2 quantum dots as a highly efficient visible-light driven photocatalyst in water remediation

Linjer Chen  1 , Shu-Ling Hsieh  2 , Chia-Hung Kuo  2 , Shuchen Hsieh  3 , Wei-Hsiang Chen  4 , Chiu-Wen Chen  1 , Cheng-Di Dong  1
Affiliations

Novel MoS2 quantum dots as a highly efficient visible-light driven photocatalyst in water remediation

Linjer Chen et al. RSC Adv. .

Abstract

A direct and efficient hydrothermal system has been established for the synthesis of MoS2 quantum dots (QDs). Novel MoS2 QDs are an excellent potential photocatalysts to enhance photocatalytic response by charge separation under visible light irradiation. The optimum capability of QDs demonstrated the excellent photocatalytic ability for the degradation of organic pollutants. The microstructural, morphological, and optical properties of the MoS2 QDs are defined via X-ray diffraction (XRD), SEM, HRTEM, XPS, and UV-Vis absorption spectroscopy techniques. Under visible light irradiation, MoS2 QDs have great photocatalytic response for the degradation of Rh B that is 20 times higher than those of bulk MoS2 materials. The QDs possess practically the same catalytic response after 5 recycle runs, which is an evident proof of its stability. This course might pave the route toward creating current visible-light caused QD photocatalyst strategies for the highly valuable degradation of organic pollutants or antibiotics.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. The UV-Vis spectra of the bulk, micro-scale and MoS2 QDs. The inset shows the corresponding plots of (αhυ)2 against photon energy (hυ).
Fig. 2
Fig. 2. The XPS spectrum of MoS2 QDs. (a) Survey spectrum; (b) high resolution of Mo; (c) high resolution of S; (d) high resolution of O; (e) Photoluminescence spectra of prepared the bulk, micro-scale and MoS2 QDs under 355 nm excitation.
Fig. 3
Fig. 3. (a) XRD patterns of the bulk, micro-scale and MoS2 quantum dots. (b) TEM images of the as-prepared micro-scale MoS2 (scale bar = 200 nm), (c) high resolution images of MoS2 QDs (scale bar = 5 nm), the inset shows the SAED of the selected area.
Fig. 4
Fig. 4. (a) Photocatalytic degradation of RhB over the bulk, micro-scale and MoS2 quantum dots under visible light irradiation, (b) comparison of apparent rate constants, (c) the TOC amount of organic pollutants before and after irradiation, (d) recycling performance of MoS2 QDs for organic pollutants, (d) recycling performance of MoS2 QDs for organic pollutants, (e) effect of trapping reactive species on the photocatalytic degradation pathway, (f) EPR spectra in the methanol dispersion for DMPO˙O2−, (g) XRD pattern of the QDs before and after the photocatalytic experiment, (h) electrochemical impedance spectra, (i) the photocatalytic reaction mechanism of organic pollutants over QDs.
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