Abstract
A chitosan resin derivatized with Schiff bases was synthesized by using a crosslinked chitosan (CCTS) as base material. We first synthesized N-benzylidene chitosan (CTB) by the reaction of benzaldehyde with chitosan. After this reaction crosslinking was carried out in the usage of epichlorohydrine (ECH) as a crosslinking agent. The Schiff base was removed by reacting diluted ethyl alcohol hydrochloride solution to give crosslinked chitosan (CCTS).The CCTS was suspended in a mixture of ethyl alcohol/deionized water followed by the addition of epichlorohydrine and by this way crosslinked chitosan-epichlorhydrine (CCTS-ECH) resin was synthesized. After the reaction was completed, the product was filtered, washed with ethyl alcohol and deionized water and dried in vacuum. The two novel polymeric ligands (CCTS-ECH-DHSalophen and CCTS-ECH-DHDPE) were synthesized by the reaction of CCTS-ECH with N,N′-bis(2,5 dihydroxybenzylidene)-1,2-diaminobenzene (DHSalophen), and N,N′-bis(2,5 dihydroxybenzylidene)-4,4′-diaminodiphenylether (DHDPE). The structures of the ligands were characterized by elemental analysis, infrared spectroscopy(FT-IR), scanning electron microscopy(SEM) and thermogravimetric analysis (TGA/DTA). Adsorption experiments (pH dependency, kinetics, and equilibrium) of compounds toward Cr(VI) from waste water were carried out at 25 °C.
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The authors are greatly indebted to the Selcuk University Research Foundation (SUAF) for providing financial support (Project number: 2004/082).
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Kocak, N., Sahin, M., Arslan, G. et al. Synthesis of Crosslinked Chitosan Possessing Schiff Base and Its Use in Metal Removal. J Inorg Organomet Polym 22, 166–177 (2012). https://doi.org/10.1007/s10904-011-9509-3
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DOI: https://doi.org/10.1007/s10904-011-9509-3