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Boost activation of peroxymonosulfate by iron doped K_(2-x)Mn_(8)O_(16):Mechanism and properties

Chinese Journal of Chemical Engineering 2023年第5期57卷 88-97页

作者： Linlin Su Meijun Chen Li Gong Hua Yang Chao Chen Jun Wu Ling Luo Gang Yang Lulu Long Institute of Ecological and Environmental Sciences Sichuan Agricultural UniversityChengdu 611130China Sichuan Keyuan Testing Center of Engineering Technology Chengdu 610091China

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-x)Mn_(8)O_(16):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-x)Mn_(8)O_(16) iron doping

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Efficient degradation of tetracycline wastewater by iron-doped biochar

Efficient degradation of tetracycline wastewater by iron-dop...

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河南省化学会2020年学术年会

作者： Yan Jia Yang Qin Xiang Li Henan Normal University School of Environment

In recent years,the environmental hazards of antibiotics have attracted widespread attention.Tetracycline is one of the most widely used antibiotics in the world in medicine and animal husbandry.Only 70%of the antibiotic is absorbed by the body,with the remainder excreted into the environment through various pathways.Studies have shown that antibiotics can cause serious harm to the water environment and human health,and are difficult to remove effectively by conventional water treatment processes.Therefore,it is crucial to develop treatment technologies that can effectively remove tetracycline.In this study,a new type of iron-doped biochar (Fe-BC)was prepared from agricultural straw to investigate its removal effect on tetracycline.The results showed that Fe-BC exhibited good catalytic degradation performance during the degradation process,with a degradation rate of up to 90%within 90 min of the reaction.

关键词： Biochar iron doping Fenton reaction

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