Adsorption of Cu2+ and Ni2+ by tripolyphosphate-crosslinked chitosan-modified montmorillonite

The adsorption of Cu2+ and Ni2+ on synthesized tripolyphosphate-crosslinked-chitosan-modified montmorillonite (TPP-crosslinked-CTS-modified MMT) was examined by kinetic and equilibrium studies. The adsorption followed a pseudo-second order kinetics. Based on the activation energies, chemisorption du...

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Bibliographic Details
Published in:Journal of solid state chemistry 2019-09, Vol.277, p.143-148
Main Authors: Kameda, Tomohito, Honda, Reina, Kumagai, Shogo, Saito, Yuko, Yoshioka, Toshiaki
Format: Article
Language:English
Subjects:
Adsorption
Chitosan-modified montmorillonite
Heavy metal ions
Tripolyphosphate-crosslinking
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Summary:The adsorption of Cu2+ and Ni2+ on synthesized tripolyphosphate-crosslinked-chitosan-modified montmorillonite (TPP-crosslinked-CTS-modified MMT) was examined by kinetic and equilibrium studies. The adsorption followed a pseudo-second order kinetics. Based on the activation energies, chemisorption due to electron transfer between TPP-crosslinked-CTS-modified MMT and the Cu2+ and Ni2+ cations was concluded to be the rate-determining step. Equilibrium analysis for the adsorption of each cation shows a good fit to the Langmuir equation. The adsorption of metal cations onto TPP-crosslinked-CTS-modified MMT proceeds because of the cation adsorption capacity of MMT, complexation with CTS, and complexation with the crosslinking agent (TPP). The selectivity toward Cu2+ was high because of the selective adsorption of this cation by CTS. Comparison of maximum adsorption amount of heavy metal ions by both adsorbents. [Display omitted] •Montmorillonite modified by crosslinked tripolyphosphate was prepared.•Kinetics and equilibrium of the adsorption of Cu2+ and Ni2 ions have been analyzed.•We were able to achieve selective adsorption of Cu2+ over Ni2+.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2019.06.002