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Single-atom Rh catalysts for efficiently degrading Rhodamine B with high concentration

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Highly concentrated dye wastewater has a serious effect on the quality of natural waters; thus, developing novel catalysts to degrade dyes rapidly and efficiently is of great significance. For the first time, this study reports an Rh single atom loaded on a nitrogen-doped carbon (SA-Rh/CN) catalyst. This catalyst exhibits an excellent processing capacity for high concentrations of Rhodamine B (RhB), high catalytic activity (95.7% degradation of RhB in 60 min) and excellent stability (93.5% degradation efficiency after 10 stable runs), all over a wide range of pH values (effective from pH 3 to 9), for the degradation of RhB. Using free radical capture experiments, SA-Rh/CN was confirmed to catalyse peroxymonosulphate to produce SO4·− and ·OH, which played important roles in the degradation of RhB. When SA-Rh/CN was generalised for the catalytic degradation of methylene blue, it also achieved excellent performance. Therefore, this study widens the applications of single-atom catalysts for Fenton-like reactions and demonstrates the potential of single-atom Rh catalysts in wastewater treatment.

Graphical abstract

摘要

高浓度染料废水严重影响天然水的水质, 因此开发新型催化剂快速高效地降解染料具有重要意义。本文报道了一种Rh单原子负载氮掺杂碳(SA-Rh/CN)催化剂, 首次发现该催化剂具有高浓度罗丹明B的处理能力、催化活性高(60分钟罗丹明B降解效率为95.7%)、稳定性强(稳定运行10次后降解效率保持93.5%)、降解罗丹明B的pH范围广(pH 3–9有效)等特点。实验证明, SA-Rh/CN催化PMS生成SO4•−和•OH, 在罗丹明B的降解中发挥了重要作用。将SA-Rh/CN推广到亚甲基蓝的催化降解中, 也取得了优异的性能。因此, 本研究拓宽了单原子催化剂在类芬顿反应中的应用, 并展示了单原子Rh催化剂在废水处理中的潜力。

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 22102218), the Science and Technology Innovation Program of Hunan Province (No. 2022RC1110) and the Young Elite Scientists Sponsorship Program by CAST (No. 2022QNRC001). We thank the BL11B station at Shanghai Synchrotron Radiation Facility (SSRF) for XAFS measurements.

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  1. Shou-Yao Hu and Jian-Ping Guan have contributed equally to this work.

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  1. Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

    Shou-Yao Hu, Jian-Ping Guan, Run-Ze Ma, Yu Tao, Dong-Hao Liu, Jia-Xin Gong & Yu Xiong

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Hu, SY., Guan, JP., Ma, RZ. et al. Single-atom Rh catalysts for efficiently degrading Rhodamine B with high concentration. Rare Met. 43, 2331–2338 (2024). https://doi.org/10.1007/s12598-023-02589-2

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  • DOI: https://doi.org/10.1007/s12598-023-02589-2

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