Synthesis of functionalized porous montmorillonite via solid-state NaOH treatment for efficient removal of cesium and strontium ions

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Solid-state NaOH treatment of montmorillonite clay was used to enhance the removal of Cs+ and Sr2+. Through this facile and low-cost modification, montmorillonite with a large BET surface area (117.1 m(2) g(-1)) and many surface functional groups (SiAOANa), demonstrated enhanced sorption kinetics (89% removal for 40 mg L-1 Cs+ and 23 mg L-1 Sr2+ in 1 h) with a sorption capacity of 290.7 mg g(-1) for Cs+ and 184.8 mg g(-1) for Sr2+, greatly exceeding the low sorption capacity (137.0 mg g(-1) for Cs+ and 15.6 mg g(-1) for Sr2+) of pristine montmorillonite. SEM-EDS and XPS analyses revealed that Cs+ and Sr2+ were ion-exchanged with Na+ on the surface functional groups formed following NaOH treatment. The performance of NaOH-treated montmorillonite was stable following gamma-ray irradiation (at 6 Gy h(-1) for 30 min) and across a broad range of pHs (3 to 11), exhibiting a high distribution coefficient (Kd) of 1.5 x 10(3) mL g(-1) for Cs+ (1.58 mg L-1) and 3.7 x 10(3) mL g(-1) for Sr2+ (1.64 mg L-1) under groundwater conditions where various cations including Na+, K+, and Ca2+ (V/m = 1 L/g) were present. The proposed method demonstrated great improvement of the sorption capacity of an abundant and inexpensive montmorillonite. (C) 2018 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2018-08
Language
English
Article Type
Article
Keywords

POTASSIUM COPPER HEXACYANOFERRATE; AQUEOUS-SOLUTION; ADSORPTION CAPACITY; SELECTIVE REMOVAL; CS+ REMOVAL; NANOCOMPOSITES; ZEOLITES; HYDROGEL; EXCHANGE; CARBON

Citation

APPLIED SURFACE SCIENCE, v.450, pp.404 - 412

ISSN
0169-4332
DOI
10.1016/j.apsusc.2018.04.181
URI
http://hdl.handle.net/10203/242517
Appears in Collection
NE-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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