Issue 61, 2016

Synthesis of imidazolium-crosslinked chitosan aerogel and its prospect as a dye removing adsorbent

Abstract

The potential utility of Debus–Radziszewski imidazole synthesis in the fabrication of crosslinked chitosan was studied. Three-component crosslinking was achieved by using glyoxal and propionaldehyde to connect amine groups of chitosan via imidazolium crosslinking. A water-insoluble (at pH range of 2–10) chitosan was obtained at room temperature with a degree of substitution of 0.45 and aerogel was obtained after freeze-drying. The ability of the imidazolium-crosslinked chitosan (ICC) aerogel to absorb an anionic dye, Direct Yellow 27, from a model water was then studied. Based on the Langmuir isotherm, at a pH of 4, an adsorption maximum of 2340 mg g−1 (3.5 mmol g−1) was obtained. In addition, due to the permanent cationic charge of imidazolium group, ICC exhibited excellent adsorption capacity, even under alkaline conditions. Methylglyoxal and benzaldehyde were also used to obtain other types of ICC, demonstrating the versatility of Debus–Radziszewski imidazole synthesis for fabrication of modified chitosan.

Graphical abstract: Synthesis of imidazolium-crosslinked chitosan aerogel and its prospect as a dye removing adsorbent

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2016
Accepted
07 Jun 2016
First published
08 Jun 2016
This article is Open Access
Creative Commons BY license

RSC Adv., 2016,6, 56544-56548

Synthesis of imidazolium-crosslinked chitosan aerogel and its prospect as a dye removing adsorbent

J. A. Sirviö, M. Visanko and H. Liimatainen, RSC Adv., 2016, 6, 56544 DOI: 10.1039/C6RA08301C

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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