Adsorption properties of a nanostructured hybrid material containing aluminium towards some metal ions |
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| Authors: | Albena K Detcheva Paunka S Vassileva Ralitsa H Georgieva Dimitrinka K Voykova Tsvetelina I Gerganova and Yordanka Y Ivanova |
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| Institution: | (1) Faculty of Environment, University of Tehran, Tehran, Iran;(2) Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, N6A 5B9, Canada;(3) Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran; |
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| Abstract: | In the present work the adsorption of some transition metal ions from aqueous solutions on a silica-based nanostructured hybrid
material modified by aluminium was investigated. The novel organic-inorganic material was synthesized via a sol-gel method through hydrolysis and co-condensation reactions. Its structure was characterized by means of SEM, XRD and
FTIR. Based on the data obtained the most probable cross-linking mechanism for the derived xerogel was proposed. The characterization
of its texture parameters was carried out by low-temperature adsorption of nitrogen. The adsorption properties of this material
with respect to Cu(II), Cr(III) and Pb(II) ions from single-component aqueous solutions and multi-component aqueous solutions
containing also Cd(II) and Fe(III) were evaluated. The effect of contact time, acidity of initial solutions and metal ion
concentrations was investigated using the batch method. Pseudo-first order, pseudo-second order and intraparticle diffusion
models were used to analyze kinetic data. In all cases the adsorption was significantly affected by the pH value. Equilibrium
modelling data were fitted to linear Langmuir, Freundlich and Dubinin-Radushkevich models. Best fit was observed for Langmuir
model, which showed determination coefficients greater than 0.992 for all ions studied. The maximum adsorption capacities
for single- and multi-component adsorption were calculated.
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