Adsorption of heavy metal ions from aqueous solutions by amine and carboxylate functionalised bentonites

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Abstract

Amine and carboxylate functionalised bentonites were used as adsorbents of heavy metal ions (Pb(II), Hg(II) and Cu(II)) from aqueous solutions. 3-aminopropyl trimethoxysilane was grafted on sodium bentonite (Bent), and this amine functionalised bentonite (BentNH 2) was converted into a carboxylate functionality (BentCOOH) by reaction with succinic anhydride. Both adsorbents were characterised by FTIR, XRD, TG/DTG, SEM and elemental analyses. Both adsorbents showed maximum adsorption of the metal ions at pH 5.0-6.0. The adsorption processes followed pseudo-second-order kinetics. The Freundlich model best fitted the adsorption data. The metal ions were mainly bound by complexation on BentNH 2 and on BentCOOH by ion exchange and complexation. The regeneration of the adsorbents was tested by repeated adsorption-desorption studies. © 2012 Elsevier B.V.

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Anirudhan, T. S., Jalajamony, S., & Sreekumari, S. S. (2012). Adsorption of heavy metal ions from aqueous solutions by amine and carboxylate functionalised bentonites. Applied Clay Science, 6566, 67–71. https://doi.org/10.1016/j.clay.2012.06.005

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