Molecular mechanisms of dimethylarsinic acid adsorption onto aluminum substituted ferrihydrite surfaces
文献类型：期刊论文
| 作者 | Ge, Yiting2; Wang, Jiaqi2; Guo, Fayang3; Yuan, Meng2; Wang, Wentao2; Li, Jiangshan4; Zhang, Jing1; Feng, Xionghan2; Tan, Wenfeng2; Wu, Yupeng2 |
| 刊名 | ENVIRONMENTAL SCIENCE-NANO
 |
| 出版日期 | 2024-03-01 |
| 页码 | 11 |
| ISSN号 | 2051-8153 |
| DOI | 10.1039/d3en00664f |
| 英文摘要 | Dimethylarsinic acid (DMA) is a common organic arsenic pollutant in the environment, and its distribution, migration, and transformation are greatly controlled by various active minerals. However, the bonding mechanisms of DMA on aluminum (Al)-substituted ferrihydrite is rarely explored. Here, ferrihydrite samples with Al substitution amounts of 0.00 +/- 0.00 mol%, 3.02 +/- 0.01 mol%, 6.71 +/- 0.11 mol%, 12.89 +/- 0.34 mol%, and 20.50 +/- 0.76 mol% were prepared, characterized, and used to test DMA adsorption behaviors and mechanisms. With the increase of Al amount, the particle size and specific surface area of ferrihydrite particles slightly decrease, and the point of zero charge gradually increases. The reaction pH has a significant impact on the DMA adsorption onto mineral surfaces. When the pH is 3-6, the DMA adsorption density is almost unchanged being 0.74-0.77 mu mol m(-2); while pH > 6, the DMA adsorption density significantly decreases. With the increase in ionic strength, the DMA adsorption density onto Al-substituted ferrihydrite is almost unaffected at pH 6, but is greatly increased at pH 9. Isothermal adsorption experiments show that Al substitution significantly improves the DMA adsorption density on ferrihydrite by 46-61%, with a maximum enhancement at an Al substitution level of 6.70 mol%. Ionic strength effect test, Fourier transform infrared spectroscopy and As K-edge extended X-ray absorption fine structure spectroscopy analysis show that DMA forms bidentate binuclear inner-sphere complexes on ferrihydrite surfaces through As-OH rather than the -CH3 group at pH 6, but predominantly forms outer-sphere complexes at pH 9. With the increase of the Al substitution level in the mineral, DMA also forms monodentate mononuclear and outer-sphere complexes on solids at pH 6. These results provide deep insights into the interaction mechanisms and fates of organoarsenicals with natural Fe (hydr)oxide minerals. |
| 资助项目 | National Natural Science Foundation of China[42077015] ; National Natural Science Foundation of China[41771267] ; National Natural Science Foundation of China[42177275] ; National Natural Science Foundation of China[2019ZD001] ; Key Science and Technology Projects of Inner Mongolia Autonomous Region[103510320036] ; Fundamental Research Funds for the Central Universities |
| WOS研究方向 | Chemistry ; Environmental Sciences & Ecology ; Science & Technology - Other Topics |
| 语种 | 英语 |
| WOS记录号 | WOS:001183839900001 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/40830]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Wu, Yupeng; Yin, Hui |
| 作者单位 | 1.Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100039, Peoples R China 2.Huazhong Agr Univ, Coll Resources & Environm, Minist Agr & Rural Affairs, Minist Agr & Rural affairs, Wuhan 430070, Peoples R China 3.Henan Polytech Univ, Inst Resource & Environm, Jiaozuo 454000, Peoples R China 4.Inst Rock & Soil Mech, Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ge, Yiting,Wang, Jiaqi,Guo, Fayang,et al. Molecular mechanisms of dimethylarsinic acid adsorption onto aluminum substituted ferrihydrite surfaces[J]. ENVIRONMENTAL SCIENCE-NANO,2024:11. |
| APA | Ge, Yiting.,Wang, Jiaqi.,Guo, Fayang.,Yuan, Meng.,Wang, Wentao.,...&Yin, Hui.(2024).Molecular mechanisms of dimethylarsinic acid adsorption onto aluminum substituted ferrihydrite surfaces.ENVIRONMENTAL SCIENCE-NANO,11. |
| MLA | Ge, Yiting,et al."Molecular mechanisms of dimethylarsinic acid adsorption onto aluminum substituted ferrihydrite surfaces".ENVIRONMENTAL SCIENCE-NANO (2024):11. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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