Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Wang, Shun1,2,3,8; Zhang, Yanjun1; Liu, Dong3 ; Yuan, Peng3,4; Li, Mengyuan3; Du, Peixin5; Zhao, Jinkui1,2; Yu, Wenbin6; Wang, Howard1,7
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| Adsorption behaviors and atomistic mechanisms of iodate and iodide on hollow spherical allophane nanoparticles | |
| Source Publication | APPLIED CLAY SCIENCE
 |
| ISSN | 0169-1317 |
| 2024-03-15 | |
| Volume | 250Pages:13 |
| DOI | 10.1016/j.clay.2024.107293 |
| Language | 英语 |
| WOS Research Area | Chemistry ; Materials Science ; Mineralogy |
| Abstract | The adsorption of radioactive iodate (IO3-) and iodide (I-) anions on natural minerals is critical for nuclear environmental safety. Allophane, a nanosized clay mineral, is considered to adsorb IO3- and I-, but the essential interactions between both anions and allophane remain unknown, due to the challenges of characterizing extremely small allophane nanoparticles in complex soils and obtaining high-purity natural allophane. In this work, neat allophane (Allo) nanoparticles were synthesized and used to study their adsorption for IO3- and Ianions. The adsorption kinetics, adsorption thermodynamics, pH -dependent adsorption-desorption, and competitive adsorption (Cl- and SO42-) were quantitatively investigated. Moreover, combined with advanced spectroscopic analyses of X-ray absorption fine structure (XAFS) and X-ray photoelectron spectroscopy (XPS), the atomistic adsorption mechanisms were illustrated. The adsorption capacities of Allo can be about 0.22 mmol/g for IO3- and 0.077 mmol/g for I-, which are at least one order of magnitude and 2.6 -fold higher than those of other clay minerals, respectively. The IO3- adsorption involved the ligand exchange and electrostatic attraction interactions, while the I- adsorption involved the Lewis acid-base and hydrogen -bond interactions. The innersphere adsorption mainly occurred in the wedge-shaped nanopores within Allo. The findings will improve the understanding of IO3- and I- adsorption on allophane, promote the practical applications of natural allophane in the management of nuclear wastes, and provide foundations for revealing the geochemical behaviors of iodine. |
| Keyword | Iodate Iodide Allophane Adsorption behavior Surface -interface interaction Adsorption mechanism |
| WOS ID | WOS:001187880500001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/77252 |
| Collection | 中国科学院广州地球化学研究所 |
| Corresponding Author | Yu, Wenbin; Wang, Howard |
| Affiliation | 1.Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Guangdong, Peoples R China 4.Guangdong Univ Technol, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China 5.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau 999078, Peoples R China 6.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Guizhou, Peoples R China 7.Spallat Neutron Source Sci Ctr, Dongguan 523803, Guangdong, Peoples R China 8.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sal, Xining 810008, Peoples R China |
| Recommended Citation GB/T 7714 | Wang, Shun,Zhang, Yanjun,Liu, Dong,et al. Adsorption behaviors and atomistic mechanisms of iodate and iodide on hollow spherical allophane nanoparticles[J]. APPLIED CLAY SCIENCE,2024,250:13. |
| APA | Wang, Shun.,Zhang, Yanjun.,Liu, Dong.,Yuan, Peng.,Li, Mengyuan.,...&Wang, Howard.(2024).Adsorption behaviors and atomistic mechanisms of iodate and iodide on hollow spherical allophane nanoparticles.APPLIED CLAY SCIENCE,250,13. |
| MLA | Wang, Shun,et al."Adsorption behaviors and atomistic mechanisms of iodate and iodide on hollow spherical allophane nanoparticles".APPLIED CLAY SCIENCE 250(2024):13. |
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