Boost activation of peroxymonosulfate by iron doped K2-xMn8O16: Mechanism and properties

doi:10.1016/j.cjche.2022.08.020

Abstract

Abstract: Among the numerous transition metal catalysts, manganese-based compounds are considered as promising peroxymonosulfate (PMS) catalysts due to their low cost and environmental friendliness, such as cryptomelane manganese oxide (K_2-xMn₈O₁₆: abbreviation KMnO). However, the limited catalytic performance of KMnO limits its practical application. In this work, iron-doped KMnO (Fe-KMnO) was prepared by one-step hydrothermal method to optimize its catalytic performance. Compared with KMnO/PMS system, Fe-KMnO/PMS system possessed more excellent removal efficiency of tetracycline (TC). Meanwhile, the Fe-KMnO/PMS system also exhibited good practical application potential and excellent stability. The mechanism of Fe-KMnO activation of PMS was further analyzed in detail. It was found that Fe participated in the redox of high-valent Mn, which promoted the activation of PMS. Moreover, The Fe site as an adsorption site enhanced the TC enrichment ability of the catalyst, reducing the mass transfer resistance and further enhancing the TC removal ability of Fe-KMnO/PMS system. This work not only provides an excellent PMS catalyst, but also offers new insights into the mechanism of PMS activation by bimetallic manganese-based catalysts.

Key words: Catalyst, Environment, Waste water, Peroxymonosulfate, K_2-xMn₈O₁₆, Iron doping

摘要： Among the numerous transition metal catalysts, manganese-based compounds are considered as promising peroxymonosulfate (PMS) catalysts due to their low cost and environmental friendliness, such as cryptomelane manganese oxide (K_2-xMn₈O₁₆: abbreviation KMnO). However, the limited catalytic performance of KMnO limits its practical application. In this work, iron-doped KMnO (Fe-KMnO) was prepared by one-step hydrothermal method to optimize its catalytic performance. Compared with KMnO/PMS system, Fe-KMnO/PMS system possessed more excellent removal efficiency of tetracycline (TC). Meanwhile, the Fe-KMnO/PMS system also exhibited good practical application potential and excellent stability. The mechanism of Fe-KMnO activation of PMS was further analyzed in detail. It was found that Fe participated in the redox of high-valent Mn, which promoted the activation of PMS. Moreover, The Fe site as an adsorption site enhanced the TC enrichment ability of the catalyst, reducing the mass transfer resistance and further enhancing the TC removal ability of Fe-KMnO/PMS system. This work not only provides an excellent PMS catalyst, but also offers new insights into the mechanism of PMS activation by bimetallic manganese-based catalysts.

关键词: Catalyst, Environment, Waste water, Peroxymonosulfate, K_2-xMn₈O₁₆, Iron doping

Linlin Su, Meijun Chen, Li Gong, Hua Yang, Chao Chen, Jun Wu, Ling Luo, Gang Yang, Lulu Long. Boost activation of peroxymonosulfate by iron doped K_2-xMn₈O₁₆: Mechanism and properties[J]. Chinese Journal of Chemical Engineering, 2023, 57(5): 88-97.

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Boost activation of peroxymonosulfate by iron doped K_2-xMn₈O₁₆: Mechanism and properties

Boost activation of peroxymonosulfate by iron doped K_2-xMn₈O₁₆: Mechanism and properties

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