Adsorption of heavy metal ions from aqueous solutions by amine and carboxylate functionalised bentonites
Source abstract
Abstract
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 (Bent NH2) was converted into a carboxylate functionality (Bent COOH) 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 Bent NH2 and on Bent COOH by ion exchange and complexation. The regeneration of the adsorbents was tested by repeated adsorption–desorption studies.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Clay minerals and soil interactions · Adsorption, diffusion, and thermodynamic properties of materials
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References (22)
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