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Vol. 25 No. 4 (2013): Vol 25 Issue 4

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Effect of Bifunctional Isocyanate Linker on Adsorption of Chromium(VI) Diphenylcarbazide Complex onto b-Cyclodextrin

https://doi.org/10.14233/ajchem.2013.13397
Sharifah Mohamad
Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
Nurul Huda Mohd Yusof
Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
Saliza Asman
Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia ; Department of Science and Mathematics, Faculty of Science, Technology and Human Development, University Tun Hussein Onn Malaysia, 86400, Parit Raja, Johor, Malaysia

Corresponding Author(s) : Sharifah Mohamad

sharifahm@um.edu.my

Asian Journal of Chemistry, Vol. 25 No. 4 (2013): Vol 25 Issue 4

Abstract

Two polymers has been synthesized using bifunctional reagents of isocyanate group as crosslinking agent, which are b-cyclodextrin polymer crosslinked hexamethylene diisocyanate (b-CDP-HMDI) and b-cyclodextrin polymer crosslinked toluene-2,4-diisocyanate (b-CDP-TDI). The adsorption of Cr(VI) ions from aqueous solution by b-cyclodextrin polymer (b-CDP) as an adsorbent was studied in batch adsorption experiments. The method was based on the complex of Cr(VI) with 1,5-diphenylcarbazide (DPC) in acidic solution loaded on b-CDP-HMDI and b-CDP-TDI adsorbents. The adsorbents were characterized using Fourier transform infrared spectroscopy. The adsorption isotherm and kinetics of Cr(VI)-DPC complex onto both of b-cyclodextrin polymer were studied. It showed that the Langmuir isotherm is better fit described the adsorption process for b-CDP-HMDI, while Freundlich isotherm is better fit for b-CDP-TDI. The pseudo second order kinetic model represented the adsorption process for both of b-cyclodextrin polymer adsorbents. However, the rate constant of adsorption by b-CDP-TDI was lower than b-CDP-HMDI. The thermodynamic study showed that the enthalpy (DHº) value of b-CDP-TDI was higher than b-CDP-HMDI, indicated that b-CDP-TDI has strong chemical bond with Cr(VI)-DPC. Furthermore, the value of free energy (DGº) and and entropy (DSº) showed that b-CDP-TDI was more absorbable of Cr(IV)-DPC complexes than b-CDP-HMDI. From these results, it was revealed that cross-linking agent is the main factor that contribute in the adsorption process of Cr(VI)-DPC complex onto b-cyclodextrin polymer.

Keywords

Bifunctional cross-linking agent Isocyanate Adsorption β-Cyclodextrin Cr(VI)
Mohamad, S., Huda Mohd Yusof, N., & Asman, S. (2012). Effect of Bifunctional Isocyanate Linker on Adsorption of Chromium(VI) Diphenylcarbazide Complex onto b-Cyclodextrin. Asian Journal of Chemistry, 25(4), 2213–2220. https://doi.org/10.14233/ajchem.2013.13397
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