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Visible-light-induced NiCo2O4@Co3O4 core/shell heterojunction photocatalysts for efficient removal of organic dyes

可见光响应型核壳异质结光催化剂NiCo2O4@Co3O4高效去除有机染料

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Abstract

Semiconductor photocatalysis has been considered as a potential technology for the removal of organic dyes from wastewater. The development of photocatalysts with high stability and strong catalytic activity is the most important in application. Visible-light-induced NiCo2O4@Co3O4 core/shell heterojunctions were synthesized via a sol-gel method in this paper. Compared to bare NiCo2O4 and Co3O4, NiCo2O4@Co3O4 showed a remarkably enhanced removal rate towards congo red (CR) degradation with 98.4% of the removal rate to CR at 120 min under irradiation. The excellent performance of NiCo2O4@Co3O4 benefits from the effective separation of photogenerated electron-holes by forming a heterojunction, and the rapid transfer efficiency of photo-generated charge carriers results from the core/shell architectures. A mechanism that NiCo2O4@Co3O4 degrades CR to harmless inorganic substances by h+, •O −2 and •OH during the photocatalytic process was proposed.

摘要

半导体光催化技术是一种去除废水中有机染料很有潜力的技术. 开发稳定性高、催化活性强的 光催化剂是该技术投入实际生产中需要解决的首要问题. 本文采用溶胶-凝胶法合成了可见光响应的核 壳NiCo2O4@Co3O4异质结. 与单一的NiCo2O4和Co3O4相比, NiCo2O4@Co3O4对刚果红(CR)的去除率显 著提高, 在光照120 min 后, CR的去除率达到98.4%. NiCo2O4@Co3O4的优异性能得益于异质结对光 生电子空穴的有效分离, 以及通过核壳结构实现的光生载流子快速转移效率. 提出了NiCo2O4@Co3O4 在光催化过程中通过h+, •O2−和•OH将CR矿化为无毒无机物的降解机理.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Huan-wei Wang  (王焕伟), Xin Fang  (房鑫), Yu-chi Wan  (万宇驰), Jing Zhan  (湛菁) & Zhi-jian Wang  (王志坚)

  2. Hunan Rare Earth Metal Material Research Institute, Changsha, 410083, China

    Zhi-jian Wang  (王志坚) & Hua Liu  (刘华)

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  1. Huan-wei Wang  (王焕伟)
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  2. Xin Fang  (房鑫)
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  3. Yu-chi Wan  (万宇驰)
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  4. Jing Zhan  (湛菁)
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  5. Zhi-jian Wang  (王志坚)
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  6. Hua Liu  (刘华)
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Corresponding authors

Correspondence to Jing Zhan  (湛菁) or Zhi-jian Wang  (王志坚).

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Foundation item

Project(2017TP1031) supported by the Hunan Key Laboratory for Rare Earth Functional Materials, China; Project (2020JJ4735) supported by the Natural Science Foundation of Hunan Province, China; Project(2018GK4001) supported by Science and Technology Department of Hunan Province Tackling Key Scientific and Technological Problems and Transformation of Major Scientific and Technological Achievements, China; Project(CSUZC202126) supported by the Open Sharing Fund for the Large-scale Instruments and Equipments of Central South University, China

Contributors

WANG Huan-wei, ZHAN Jing and WANG Zhi-jian provided the concept. WANG Huan-wei and FANG Xin edited the draft of manuscript. WAN Yu-chi and LIU Hua helped to discuss the results and the corresponding analysis. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

WANG Huan-wei, FANG Xin, WAN Yu-chi, ZHAN Jing, WANG Zhi-jian, LIU Hua declare that they have no conflict of interest.

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Wang, Hw., Fang, X., Wan, Yc. et al. Visible-light-induced NiCo2O4@Co3O4 core/shell heterojunction photocatalysts for efficient removal of organic dyes. J. Cent. South Univ. 28, 3040–3049 (2021). https://doi.org/10.1007/s11771-021-4793-8

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