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Efficient adsorption of iodide from water by chrysotile bundles with wedge-shaped nanopores
Wenbin Yu;  Huifang Xu;  Eric E. Roden;  Quan Wan
2019
发表期刊Applied Clay Science
卷号183页码:1-10
摘要

Immobilization of iodide (I−) from groundwater and soils is a challenging subject due to the large size and low charge of I−. Clay minerals and (hydr)oxides generally exhibit very low adsorption capacity due to anion exclusion or weak attraction. For the first time, the adsorption of I− by chrysotile bundles (Chry-B) was investigated and a characteristic mechanism was established by comparing the adsorption of I− on Chry-B with dispersed chrysotile single nanotubes, lizardite and brucite. The adsorption of I− by Chry-B reached equilibrium with 24 h, and Chry-B exhibited very strong adsorption to I−, with a distribution coefficient (K d) of 179.24 mL/g, which is two orders of magnitude higher than those for previously reported clay minerals. The Langmuir adsorption capacity of Chry-B was 4.13 mg/g. The wedge-shaped nanopores among the neighboring nanotubes in Chry-B proved to be the primary adsorption sites for I−. The I− at end of the wedge sites was strongly bonded by the nanopores due to the severe superposition of electric potentials from the charged walls of the narrowing wedges. These results demonstrated that chrysotile bundles were a promising candidate for adsorption of I−, and that the shape of nanopore geometry was crucial in I− adsorption. Unlabelled Image • The adsorption of iodide by chrysotile bundles was investigated for the first time. • Chrysotile bundles exhibited very strong adsorption to iodide. • The wedge-shaped nanopores among neighboring nanotubes are the adsorption sites. • The shape of nanopores geometry is crucial in iodide adsorption.

关键词Adsorption Chrysotile Bundles Iodide Nuclear Waste Wedge-shaped Nanopore
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10458
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550081, China
2.Department of Geosciences, University of Wisconsin–Madison, Madison, WI 53706, United States
3.CAS Center for Excellence in Comparative Planetology, Hefei 230026, China
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Wenbin Yu;Huifang Xu;Eric E. Roden;Quan Wan. Efficient adsorption of iodide from water by chrysotile bundles with wedge-shaped nanopores[J]. Applied Clay Science,2019,183:1-10.
APA Wenbin Yu;Huifang Xu;Eric E. Roden;Quan Wan.(2019).Efficient adsorption of iodide from water by chrysotile bundles with wedge-shaped nanopores.Applied Clay Science,183,1-10.
MLA Wenbin Yu;Huifang Xu;Eric E. Roden;Quan Wan."Efficient adsorption of iodide from water by chrysotile bundles with wedge-shaped nanopores".Applied Clay Science 183(2019):1-10.
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