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In situ synthesis of CdS/ZnS composite nanoparticles from ZIF-8 for visible light disposal of Cr(VI)

  • Original Paper: Sol-gel and hybrid materials for energy, environment and building applications
  • Published:
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Abstract

Zeolitic Imidazolate Framework (ZIF-8) micropolyhedra were employed as a raw material for the synthesis of fine cadmium sulfide/zinc sulfide (CdS/ZnS) composite nanoparticle. The structure and optical properties of the composite nanoparticle were investigated and the results suggested that the introduction of cadmium nitrate tetrahydrate led to the decomposition of ZIF-8 polyhedra. The CdS/ZnS composite nanoparticle was selected as catalyst for the photo-reduction of Cr(VI) ion under visible light. The catalytic data indicated that the fine CdS/ZnS composite nanoparticle displayed an excellent performance and good reusability for the reduction of Cr(VI). In addition, the influence of the dosage of the catalyst, the concentration of Cr(VI) as well as the pH on the catalytic activity was investigated. Finally, the catalytic reaction mechanism was studied to illustrate the possible reaction process by adding the radical scavengers in the reaction solution and Electron Spin-resonance Spectroscopy. It was suggested that the advantage of the fine composite nanoparticles facilitated the exposure to Cr(VI) ions and prevent the aggregation of CdS nanoparticles in the composite structure. Besides, the presence of ZnS in the composite could well prevent the combination of the electrons and holes generated from CdS.

The CdS/ZnS composite nanoparticle synthesized from ZIF-8 demonstrated a robust photo-catalytic activity for the reduction of Cr(VI).

Highlights

  • CdS/ZnS nanoparticle was synthesized from ZIF-8.

  • It displayed a robust catalytic ability and reusability for Cr(VI) reduction.

  • An efficient separation of electrons/holes was observed.

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Acknowledgements

This work was supported by the Natural Science Research Project of Anhui Education Department (KJ2019A0806). LG wants to thank College Students’ innovation and Entrepreneurship Project (S202010879136) for the support.

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Authors and Affiliations

  1. College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu, 233010, China

    Lei Bai, Lili Ge, Junjiu Gu & Shaojun Li

  2. Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, 230601, China

    Lu Fang

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  1. Lei Bai
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  2. Lili Ge
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Correspondence to Lei Bai.

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Bai, L., Ge, L., Gu, J. et al. In situ synthesis of CdS/ZnS composite nanoparticles from ZIF-8 for visible light disposal of Cr(VI). J Sol-Gel Sci Technol 99, 211–219 (2021). https://doi.org/10.1007/s10971-021-05541-x

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  • DOI: https://doi.org/10.1007/s10971-021-05541-x

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