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

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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.

Original languageEnglish
Pages (from-to)143-148
Number of pages6
JournalJournal of Solid State Chemistry
Publication statusPublished - 2019 Sept


  • Adsorption
  • Chitosan-modified montmorillonite
  • Heavy metal ions
  • Tripolyphosphate-crosslinking


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