Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Adsorption of heavy metal ions from aqueous solutions by amine and carboxylate functionalised bentonites
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 (BentNH2) 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 BentNH2 and on BentCOOH by ion exchange and complexation. The regeneration of the adsorbents was tested by repeated adsorption–desorption studies.
Adsorption of heavy metal ions from aqueous solutions by amine and carboxylate functionalised bentonites
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 (BentNH2) 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 BentNH2 and on BentCOOH by ion exchange and complexation. The regeneration of the adsorbents was tested by repeated adsorption–desorption studies.
Adsorption of heavy metal ions from aqueous solutions by amine and carboxylate functionalised bentonites
Anirudhan, T.S. (Autor:in) / Jalajamony, S. (Autor:in) / Sreekumari, S.S. (Autor:in)
Applied Clay Science ; 65-66 ; 67-71
04.06.2012
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Sorption of Cu^2^+ from aqueous solutions by Slovak bentonites
| British Library Online Contents | 2012
Enhanced pesticide adsorption by thermally modified bentonites
| Online Contents | 2001
Stability of bentonites in salt solutions
| Online Contents | 2010