Amorphous Fe-Doped Manganese Carbonate for Efficient Activation of Peroxymonosulfate: Mechanism and Performance Toward Orange II Degradation
A novel amorphous Fe-doped manganese carbonate (a-FeMn-1) was synthesized via a facile co-precipitation method and evaluated as an efficient heterogeneous catalyst for the activation of peroxymonosulfate (PMS) in the degradation of Orange II. Among various Fe/Mn molar ratios, the 1:1 composition (a-...
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2025-05-01
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| author | Peng Cheng Yuqing Li Yunlong Ma Cui Qiu Tengfei Fu Yajie Wang Feng Wu |
| author_facet | Peng Cheng Yuqing Li Yunlong Ma Cui Qiu Tengfei Fu Yajie Wang Feng Wu |
| author_sort | Peng Cheng |
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| description | A novel amorphous Fe-doped manganese carbonate (a-FeMn-1) was synthesized via a facile co-precipitation method and evaluated as an efficient heterogeneous catalyst for the activation of peroxymonosulfate (PMS) in the degradation of Orange II. Among various Fe/Mn molar ratios, the 1:1 composition (a-FeMn-1) showed optimal catalytic activity, achieving 98% removal efficiency within 60 min under near-neutral pH conditions. Characterization results indicated that Fe doping effectively induced an amorphous structure and increased surface area and oxygen defects, promoting PMS activation. The system displayed broad pH applicability and resistance to Cl<sup>−</sup> and natural organic matter, while degradation was inhibited by HCO<sub>3</sub><sup>−</sup> and PO<sub>4</sub><sup>3−</sup>. EPR and quenching experiments confirmed that surface-bound sulfate radicals (SO<sub>4</sub><sup>•−</sup>), hydroxyl radicals (<sup>•</sup>OH), and singlet oxygen (<sup>1</sup>O<sub>2</sub>) were the primary reactive species. XPS analysis further revealed the redox cycling of Fe and Mn and the involvement of defect oxygen in the PMS activation process. The catalyst also demonstrated excellent reusability over five cycles without significant loss in efficiency. This work provides insights into the rational design of amorphous bimetallic materials for sulfate radical-based advanced oxidation processes. |
| format | Article |
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| publishDate | 2025-05-01 |
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| spelling | doaj-art-de5e49a3dbf74c4f997a98a92aeaffac2025-08-20T03:11:22ZengMDPI AGMolecules1420-30492025-05-013011232510.3390/molecules30112325Amorphous Fe-Doped Manganese Carbonate for Efficient Activation of Peroxymonosulfate: Mechanism and Performance Toward Orange II DegradationPeng Cheng0Yuqing Li1Yunlong Ma2Cui Qiu3Tengfei Fu4Yajie Wang5Feng Wu6Hubei Key Laboratory of Biomass Resource Chemistry and Environmental Biotechnology, School of Resources and Environmental Science, Wuhan University, Wuhan 430079, ChinaSchool of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, ChinaSchool of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, ChinaSchool of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, ChinaKey Laboratory of Coastal Science and Integrated Management, First Institute of Oceanography, Ministry of Natural Resources of the People’s Republic of China, Qingdao 266061, ChinaSchool of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, ChinaHubei Key Laboratory of Biomass Resource Chemistry and Environmental Biotechnology, School of Resources and Environmental Science, Wuhan University, Wuhan 430079, ChinaA novel amorphous Fe-doped manganese carbonate (a-FeMn-1) was synthesized via a facile co-precipitation method and evaluated as an efficient heterogeneous catalyst for the activation of peroxymonosulfate (PMS) in the degradation of Orange II. Among various Fe/Mn molar ratios, the 1:1 composition (a-FeMn-1) showed optimal catalytic activity, achieving 98% removal efficiency within 60 min under near-neutral pH conditions. Characterization results indicated that Fe doping effectively induced an amorphous structure and increased surface area and oxygen defects, promoting PMS activation. The system displayed broad pH applicability and resistance to Cl<sup>−</sup> and natural organic matter, while degradation was inhibited by HCO<sub>3</sub><sup>−</sup> and PO<sub>4</sub><sup>3−</sup>. EPR and quenching experiments confirmed that surface-bound sulfate radicals (SO<sub>4</sub><sup>•−</sup>), hydroxyl radicals (<sup>•</sup>OH), and singlet oxygen (<sup>1</sup>O<sub>2</sub>) were the primary reactive species. XPS analysis further revealed the redox cycling of Fe and Mn and the involvement of defect oxygen in the PMS activation process. The catalyst also demonstrated excellent reusability over five cycles without significant loss in efficiency. This work provides insights into the rational design of amorphous bimetallic materials for sulfate radical-based advanced oxidation processes.https://www.mdpi.com/1420-3049/30/11/2325iron–manganese compositeamorphous materialperoxymonosulfate (PMS)advanced oxidation process (AOP)dye |
| spellingShingle | Peng Cheng Yuqing Li Yunlong Ma Cui Qiu Tengfei Fu Yajie Wang Feng Wu Amorphous Fe-Doped Manganese Carbonate for Efficient Activation of Peroxymonosulfate: Mechanism and Performance Toward Orange II Degradation Molecules iron–manganese composite amorphous material peroxymonosulfate (PMS) advanced oxidation process (AOP) dye |
| title | Amorphous Fe-Doped Manganese Carbonate for Efficient Activation of Peroxymonosulfate: Mechanism and Performance Toward Orange II Degradation |
| title_full | Amorphous Fe-Doped Manganese Carbonate for Efficient Activation of Peroxymonosulfate: Mechanism and Performance Toward Orange II Degradation |
| title_fullStr | Amorphous Fe-Doped Manganese Carbonate for Efficient Activation of Peroxymonosulfate: Mechanism and Performance Toward Orange II Degradation |
| title_full_unstemmed | Amorphous Fe-Doped Manganese Carbonate for Efficient Activation of Peroxymonosulfate: Mechanism and Performance Toward Orange II Degradation |
| title_short | Amorphous Fe-Doped Manganese Carbonate for Efficient Activation of Peroxymonosulfate: Mechanism and Performance Toward Orange II Degradation |
| title_sort | amorphous fe doped manganese carbonate for efficient activation of peroxymonosulfate mechanism and performance toward orange ii degradation |
| topic | iron–manganese composite amorphous material peroxymonosulfate (PMS) advanced oxidation process (AOP) dye |
| url | https://www.mdpi.com/1420-3049/30/11/2325 |
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