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Title: Fe 3O 4/cyclodextrin polymer nanocomposites for selective heavy metals removal from industrial wastewater
Authors: Badruddoza, A.Z.M.
Shawon, Z.B.Z.
Tay, W.J.D.
Hidajat, K. 
Uddin, M.S.
Keywords: β-Cyclodextrin polymer
Heavy metals
Magnetic nanocomposites
Selective adsorption
Issue Date: 2-Jan-2013
Citation: Badruddoza, A.Z.M., Shawon, Z.B.Z., Tay, W.J.D., Hidajat, K., Uddin, M.S. (2013-01-02). Fe 3O 4/cyclodextrin polymer nanocomposites for selective heavy metals removal from industrial wastewater. Carbohydrate Polymers 91 (1) : 322-332. ScholarBank@NUS Repository.
Abstract: In this work, carboxymethyl-β-cyclodextrin (CM-β-CD) polymer modified Fe 3O 4 nanoparticles (CDpoly-MNPs) was synthesized for selective removal of Pb 2+, Cd 2+, Ni 2+ ions from water. This magnetic adsorbent was characterized by TEM, FTIR, XPS and VSM. The adsorption of all studied metal ions onto CDpoly-MNPs was found to be dependent on pH, ionic strength, and temperature. Batch adsorption equilibrium was reached in 45 min and maximum uptakes for Pb 2+, Cd 2+ and Ni 2+ in non-competitive adsorption mode were 64.5, 27.7 and 13.2 mg g -1, respectively at 25 °C. Adsorption data were fitted well to Langmuir isotherm and pseudo-second-order models for kinetic study. The polymer grafted on MNPs enhanced the adsorption capacity because of the complexing abilities of the multiple hydroxyl and carboxyl groups in polymer backbone with metal ions. In competitive adsorption experiments, CDpoly-MNPs could preferentially adsorb Pb 2+ ions with an affinity order of Pb 2+ Cd 2+ > Ni 2+ which can be explained by hard and soft acids and bases (HASB) theory. Furthermore, we explored the recyclability of CDpoly-MNPs. © 2012 Elsevier Ltd.
Source Title: Carbohydrate Polymers
ISSN: 01448617
DOI: 10.1016/j.carbpol.2012.08.030
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