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Ascorbic acid enhanced MnFe2O4/peroxymonosulfate oxidation of organic pollutant: Key role of singlet oxygen generation and Fe/Mn cycling

文献类型： 外文期刊

作者： Wang, Yanhao 1 ; Liu, Mingyang 1 ; Zang, Yanqiang 3 ; Zhou, Chengzhi 1 ; Xin, Yanjun 1 ; Chai, Chao 1 ; Li, Yan 4 ; Ma, Dong 1 ;

作者机构： 1.Qingdao Agr Univ, Coll Resource & Environm, Qingdao 266109, Peoples R China

2.Ocean Univ China, Key Lab Marine Environm & Ecol, Minist Educ, Qingdao 266100, Peoples R China

3.Weifang Garden & Sanitat Serv Ctr, Weifang 261031, Peoples R China

4.Shandong Acad Agr Sci, Inst Agr Resources & Environm, Jinan 250100, Peoples R China

5.Qingdao Agr Univ, Coll Resource & Environm, 700 Changcheng Rd, Qingdao 266109, Peoples R China

关键词： Peroxymonosulfate; Ascorbic acid; Singlet oxygen; Fe; mn cycling

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.91； 五年影响因子：8.549 ）

ISSN： 0301-4797

年卷期： 2022 年 321 卷

页码：

收录情况： SCI

摘要： The activated peroxymonosulfate (PMS) process has been widely applied for degrading organic pollutants. However, its application is limited by low metal cycling, and the contribution of oxygen species remains unclear. Here, the crystal structure, surface morphology, and elemental valence of the synthesized manganese ferrite (MnFe2O4) catalyst were investigated by SEM, HRTEM, XRD, and XPS. A novel MnFe2O4/PMS/ascorbic acid (AA) system was constructed to enhance the Fe/Mn cycling on the surfaces of the MnFe2O4 catalyst. The addition of AA can significantly increase the decomposition of organic pollutants, and the apparent rate constant of the MnFe2O4/PMS/AA system is 8.2 times higher than that of MnFe2O4/PMS. AA facilitates the reduction of Fe/Mn (III) and the dissolution of Fe/Mn(II), creating a Fe/Mn cycle between the heterogeneous and homogeneous interfaces of the catalyst. Furthermore, AA greatly increases the activity of adsorbed oxygen on the catalyst surfaces, generating a large amount of singlet oxygen (1O2), which contributes significantly to the destruction of organic pollutants. The efficient, fast, and environmentally friendly PMS activation method in this study can provide reliable technical support for treating refractory organic pollutants in water.

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