LDH@montmorillonite nanocomposite as a novel anion-exchanger to adsorb uranyl ion from carbonate-containing solutions

A layered double hydroxide@montmorillonite nanocomposite (LDH@MMT) was synthesized by the coating of growing LDH layers onto the MMT surface through hydrothermal method and used to remove uranyl ion from carbonate-containing aqueous solutions. The adsorption kinetics was described using a pseudo-sec...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2017-10, Vol.314 (1), p.415
Main Authors: Seddighi, Hassan, Khodadadi Darban, Ahmad, Khanchi, Alireza, Fasihi, Javad, Koleini, Javad
Format: Article
Language:English
Subjects:
Adsorption
Carbonates
Clay
Hydroxides
Montmorillonite
Pollution control
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Summary:A layered double hydroxide@montmorillonite nanocomposite (LDH@MMT) was synthesized by the coating of growing LDH layers onto the MMT surface through hydrothermal method and used to remove uranyl ion from carbonate-containing aqueous solutions. The adsorption kinetics was described using a pseudo-second-order model and the adsorption isotherms data was successfully explained by the Langmuir model. The adsorption capacity of MMT was considerably enhanced from 16 to more than 55 mg g.sup.-1 after coating of LDH at a wide range of pH (3-11). The synthesized hybrid adsorbent showed a higher affinity toward UO.sub.2(CO.sub.3)22- and UO.sub.2(CO.sub.3)34- species. These findings herein propose that LDH@MMT nanocomposite is a potential and proper adsorbent for the removal of U(VI) from natural and polluted waters.
ISSN:0236-5731
DOI:10.1007/s10967-017-5387-7