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First successful synthesis of an Al-rich mesoporous aluminosilicate for fast radioactive strontium capture

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Title
First successful synthesis of an Al-rich mesoporous aluminosilicate for fast radioactive strontium capture
Author(s)
Jeon, H.; Seok, J.; Ha, Y.; Jeong-Chul Kim; Cho, H.S.; Yang, H.-M.; Choi, M.
Publication Date
2023-06
Journal
Journal of Hazardous Materials, v.451
Publisher
Elsevier B.V.
Abstract
Al-rich zeolites such as NaA (Si/Al = 1.00) have been widely applied to remove radioactive 90Sr2+ because of their high surface charge density enabling efficient ion-exchange of multivalent cations. However, due to the small micropore diameters of zeolites and large molecular size of strongly hydrated Sr2+, Sr2+-exchange with zeolites suffers from very slow kinetics. In principle, mesoporous aluminosilicates with low Si/Al ratios close to unity and tetrahedrally coordinated Al sites can exhibit both high capacity and fast kinetics in Sr2+-exchange. Nonetheless, the synthesis of such materials has not been realized yet. In this study, we demonstrate the first successful synthesis of an Al-rich mesoporous silicate (ARMS) using a cationic organosilane surfactant as an efficient mesoporogen. The material exhibited a wormhole-like mesoporous structure with a high surface area (851 m2 g–1) and pore volume (0.77 cm3 g–1), and an Al-rich framework (Si/Al = 1.08) with most Al sites tetrahedrally coordinated. Compared to commercially applied NaA, ARMS exhibited a dramatically improved Sr2+-exchange kinetics (>33-fold larger rate constant) in batch adsorption while showing similarly high Sr2+ capture capacity and selectivity. Due to the fast Sr2+-exchange kinetics, the material also exhibited 3.3-fold larger breakthrough volume than NaA in fixed-bed continuous adsorption. © 2023 Elsevier B.V.
URI
https://pr.ibs.re.kr/handle/8788114/13165
DOI
10.1016/j.jhazmat.2023.131136
ISSN
0304-3894
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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