Synergistic adsorption-oxidation mechanisms of Fe-Mn modified humin for enhanced As(III) and As(V) removal: Experimental and density functional theory study
文献类型：期刊论文
| 作者 | Han, Wei1; Wei, Chaoyang2; Lai, Yujian1; Wang, Menglu1; Zhang, Meng1; Ji, Hongbing1; Li, Zifu1 |
| 刊名 | SEPARATION AND PURIFICATION TECHNOLOGY
 |
| 出版日期 | 2026-02-26 |
| 卷号 | 382页码:135818 |
| 关键词 | Fe-Mn binary oxides Humin Adsorption Oxidation Density functional theory |
| ISSN号 | 1383-5866 |
| DOI | 10.1016/j.seppur.2025.135818 |
| 产权排序 | 2 |
| 文献子类 | Article |
| 英文摘要 | Arsenic (As) contamination pose a significantly threat to environmental water safety due to its high toxicity and mobility. Humin (Hu) derived from coal-based waste residues (including peat, weathered coal, and lignite) was utilized to develop novel iron-manganese oxide-modified composite materials. Results indicated that lignite-based Hu composite material (FM-LH) had the best removal performance, with equilibrium total As removal capacities of 75 and 40 mg/g for As(III) and As(V) systems at 298 K. Notably, 44 % of As(III) removal occurred through oxidation to As(V), followed by adsorption. The efficient oxidation and adsorption of arsenic result from a unique synergistic mechanism: the abundant Mn(IV) and hydroxyl density on the surface, and the stable equivalent to MnOH/equivalent to FeOH complex structures. DFT calculations and experiments clarify the arsenic removal pathways. As (V) predominantly formed a highly stable equivalent to Fe2O2AsOOH- complex through bidentate corner-sharing (C-2) complexes on equivalent to FeOH surfaces. As(III) was adsorbed through 2C complexes and hydrogen bonding with the MnO6 octahedron. Subsequently, a portion of As(III) was oxidized by Mn(IV) to As(V). FM-LH retained excellent performance across a wide pH range (2-9) and ionic strength conditions (0-0.5 mol/L), retaining 96 % and 70 % of its total As removal capacity for As(III) and As(V) systems, respectively, after five cycles. This study provides a theoretical foundation for the development of low-cost, highly stable arsenic remediation materials and suggests a sustainable waste utilization strategy. |
| URL标识 | 查看原文 |
| WOS关键词 | FERRIHYDRITE ; COMPOSITE ; SORPTION ; OXIDES |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001615957800001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/219685]  |
| 专题 | 陆地表层格局与模拟院重点实验室_外文论文 |
| 通讯作者 | Ji, Hongbing |
| 作者单位 | 1.Univ Sci & Technol Beijing, Sch Energy & Environm Engn, 30 Xueyuan Rd, Beijing 100083, Peoples R China; 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, A11 Datun Rd, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Han, Wei,Wei, Chaoyang,Lai, Yujian,et al. Synergistic adsorption-oxidation mechanisms of Fe-Mn modified humin for enhanced As(III) and As(V) removal: Experimental and density functional theory study[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2026,382:135818. |
| APA | Han, Wei.,Wei, Chaoyang.,Lai, Yujian.,Wang, Menglu.,Zhang, Meng.,...&Li, Zifu.(2026).Synergistic adsorption-oxidation mechanisms of Fe-Mn modified humin for enhanced As(III) and As(V) removal: Experimental and density functional theory study.SEPARATION AND PURIFICATION TECHNOLOGY,382,135818. |
| MLA | Han, Wei,et al."Synergistic adsorption-oxidation mechanisms of Fe-Mn modified humin for enhanced As(III) and As(V) removal: Experimental and density functional theory study".SEPARATION AND PURIFICATION TECHNOLOGY 382(2026):135818. |
入库方式： OAI收割
来源：地理科学与资源研究所
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