Preparation of Molybdenum Disulfide Quantum Dots/Reduced Graphene Oxide Composites and Their Photocatalytic Degradation of Organic Dyes， Tetracyclines and Cr（VI）

doi:10.19894/j.issn.1000-0518.210115

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (5): 769-778.DOI: 10.19894/j.issn.1000-0518.210115

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Preparation of Molybdenum Disulfide Quantum Dots/Reduced Graphene Oxide Composites and Their Photocatalytic Degradation of Organic Dyes， Tetracyclines and Cr（VI）

Yi-Xin XU, Shuang WANG, Jing QUAN, Wan-Ting GAO, Tian-Qun SONG, Mei YANG()

School of Chemistry and Chemical Engineering，Liaoning Normal University，Dalian 116029，China

Received:2021-03-15 Accepted:2021-08-28 Published:2022-05-01 Online:2022-05-24
Contact: Mei YANG
About author:yangmeils@163.com
Supported by:
the Scientific Research Funds project of Liaoning Education Department(LJ2020010);the New Doctoral Research Project in Liaoning Normal University(203070091905)

1. Preparation of Molybdenum Disulfide Quantum Dots/Reduced Graphene Oxide Composites and Their Photocatalytic Degradation of Organic Dyes, Tetracyclines and Cr(VI).pdf(283KB)

Abstract

Abstract:

Molybdenum disulfide quantum dots/reduced graphene oxide （MoS₂ QDs/rGO） composites were prepared by a one-pot solvothermal reduction method with sodium molybdate， L-cysteine and graphene oxide as raw materials. The photocatalytic degradation performance of photocatalysts was studied under visible light with rhodamine B （RhB）， methylene blue （MB）， tetracyclines （TC） and Cr（VI） as the target pollutants， respectively. MoS₂ QDs/rGO composites exhibit excellent photocatalytic activity and stability that are superior to molybdenum disulfide quantum dots and reduced graphene oxide. The photodegradation rates of RhB， MB and Cr（VI） are all above 97%， and those of TC are 69%. Moreover， MoS₂ QDs/rGO composites possess high photocatalytic stability and reusability and could be reused for ten times without significant decrease of photocatalytic activity. The photodegradation rates of the two dyes are both maintained over 90%. The photodegradation mechanism of MoS₂ QDs/rGO composites is studied by adding radical scavengers of isopropanol， p-benzoquinone and EDTA-2Na， respectively. It is found that superoxide radical （·O $2 -$ ） is the main active species of MoS₂ QDs/rGO.

Key words: Molybdenum disulfide quantum dots/reduced graphene oxide, Photocatalytic degradation, Organic dyes, Tetracyclines, Chromium（VI）

CLC Number:

O643

Yi-Xin XU, Shuang WANG, Jing QUAN, Wan-Ting GAO, Tian-Qun SONG, Mei YANG. Preparation of Molybdenum Disulfide Quantum Dots/Reduced Graphene Oxide Composites and Their Photocatalytic Degradation of Organic Dyes， Tetracyclines and Cr（VI）[J]. Chinese Journal of Applied Chemistry, 2022, 39(5): 769-778.

Figures/Tables 12

Fig.1 SEM images of rGO （A）， MoS2 QDs （B） and MoS2 QDs/rGO （C）

Fig.2 TEM image of MoS2 QDs/rGO

Fig.3 AFM image of MoS2 QDs/rGO

Fig.4 XRD patterns of MoS2 QDs/rGO

Fig.5 FT-IR spectra of GO， MoS2 and MoS2 QDs/rGO

Fig.6 Photocatalytic degradation curves of RhB （A）， MB （B）， TC（C） and Cr（Ⅵ）（D） by MoS2 QDs/rGO， MoS2 and rGO

Fig.7 Photocatalytic degradation of RhB， MB， TC and Cr（Ⅵ） with different amount of MoS2 QDs/rGO （A - D） and at different reaction system pH values （E - H）

Fig.8 Photocatalytic degradation of RhB and MB （A）， TC and Cr（Ⅵ）（B） with MoS2 QDs/rGO as a function of cycling times

Table 1 The photocatalytic degradation kinetics of RhB， MB， TC and Cr（Ⅵ）

目标污染物 Samples	动力学反应级数 Reaction order	回归方程 Regression equation	相关系数 r
	0	ρ_t =－0.0118t+0.936	0.981
RhB	1	ln ρ_t =－0.0320t+0.163	0.990
	2	1/ρ_t =0.136t－0.794	0.903
	0	ρ_t =－0.0119t+0.872	0.950
MB	1	ln ρ_t =－0.0387t+0.104	0.997
	2	1/ρ_t =0.231t－1.91	0.925
	0	ρ_t =－0.0062t+0.766	0.976
TC	1	ln ρ_t =－0.0119t－0.236	0.997
	2	1/ρ_t =0.0246t+1.17	0.995
	0	ρ_t =－0.0088t+0.656	0.958
Cr（Ⅵ）	1	ln ρ_t =－0.0372t－0.178	0.996
	2	1/ρ_t =0.281t－2.30	0.910

Fig.9 Absorbance curves of RhB（A）， MB（B）， TC（C） and Cr（Ⅵ）（D） at different times

Fig.10 Effect of different radical scavengers on photodegradation of RhB， MB， TC and Cr（Ⅵ）

Fig.11 Photocatalytic degradation mechanism of MoS2 QDs/rGO

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Preparation of Molybdenum Disulfide Quantum Dots/Reduced Graphene Oxide Composites and Their Photocatalytic Degradation of Organic Dyes， Tetracyclines and Cr（VI）

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