Citation: Zifeng LIN, Shanshan GONG, Yang SHA, Zhenmin ZHANG, Changlin YU. Graphene quantum dots/SnS₂ composite nanosheets: Preparation and photocatalytic performance in reducing Cr(Ⅵ)[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(5): 959-968. doi: 10.11862/CJIC.20250320 shu

Graphene quantum dots/SnS₂ composite nanosheets: Preparation and photocatalytic performance in reducing Cr(Ⅵ)

Zifeng LIN ^{1, 2} ,
Shanshan GONG ² ,
Yang SHA ² ,
Zhenmin ZHANG ^{2, 3} ,
Changlin YU ^2,,

1.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510000, China
2.
School of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China
3.
School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China

Corresponding author: Changlin YU, yuchanglinjx@163.com
Received Date: 19 October 2025
Revised Date: 14 March 2026

Figures(10)

A SnS₂ composite nanosheet photocatalyst (GQDs/SnS₂) loaded with graphene quantum dots (GQDs) was successfully synthesized via a simple one-step hydrothermal method. The effects of different carbon sources (sodium citrate and citric acid) on the photocatalytic reduction performance of hexavalent chromium (Cr(Ⅵ)) were systematically investigated. The as-prepared materials were comprehensively characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), nitrogen adsorption-desorption measurements, and X-ray photoelectron spectroscopy (XPS). The characterization results confirmed that GQDs were successfully anchored onto the surface of hexagonal-phase SnS₂ nanosheets. Photocatalytic experiments revealed that the GQDs/SnS₂ composite prepared using sodium citrate as the carbon source exhibited excellent photocatalytic activity, achieving a 100% reduction rate of Cr(Ⅵ) within 60 min, whereas pristine SnS₂ showed a much lower reduction rate of only 56% under the same conditions. Further analysis indicated that the introduction of GQDs significantly increased the specific surface area of the catalyst, broadened the light absorption range, and effectively promoted the separation and transfer of photogenerated charge carriers. As a result, the photocatalytic reduction performance of Cr(Ⅵ) was markedly enhanced.
- photocatalysis,
- Cr(Ⅵ) reduction,
- composite nanosheets,
- SnS₂,
- graphene quantum dots
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沈阳化工大学材料科学与工程学院沈阳 110142

Graphene quantum dots/SnS2 composite nanosheets: Preparation and photocatalytic performance in reducing Cr(Ⅵ)

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Graphene quantum dots/SnS₂ composite nanosheets: Preparation and photocatalytic performance in reducing Cr(Ⅵ)