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Preparation of cobalt based organic metal framework ZIF-67 catalyst for activating PMS and its catalytic system for rapid degradation of various high concentration dyes
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Resumo(s)
Persistent organic pollutants pose significant long-term risks to environmental and human health due to their carcinogenic, mutagenic, and teratogenic properties. This study focuses on the efficient activation of peroxymonosulfate (PMS) through the rational design of a cobalt-based metal–organic framework (ZIF-67) catalyst, enabling rapid degradation of high-concentration dye pollutants. By optimizing the molar ratio of 2-methylimidazole (2-MeIM) to Co(NO3)2·6H2O and employing a hydrothermal synthesis method, we fabricated ZIF-67 (4 : 1) with high crystallinity, large specific surface area (1656.68 m2 g−1), and stable degradation performance. The ZIF-67 (4 : 1)/PMS system achieved complete degradation of 20 mg L−1 and 100 mg per L Rhodamine B (RhB) within 60 seconds and 6 minutes, respectively, surpassing recent reported efficiencies. The system also maintained high activity over a broad pH range (3–9). Radical quenching experiments and electron paramagnetic resonance (EPR) analysis identified sulfate radicals (˙SO4−4) and singlet oxygen (1O2) as the dominant reactive species. Furthermore, the catalyst exhibited excellent recyclability with no significant loss in activity after five consecutive cycles. This work provides a facile and scalable strategy for preparing highly active cobalt-based catalysts, demonstrating great potential for practical applications in industrial wastewater treatment and environmental remediation.
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Contexto Educativo
Citação
Cai, Y., Liu, X., Yang, W., Peng, H., Meng, L., & Zhao, S. (2025). Preparation of cobalt based metal organic framework ZIF-67 catalyst for activating peroxymonosulfate and its catalytic system for rapid degradation of Rhodamine B and other dyes at high concentrations. RSC Adv., 15, pp. 49875-49888. https://doi.org/10.1039/D5RA08184J
Editora
The Royal Society of Chemistry