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Gels 2015, 1(1), 94-116; doi:10.3390/gels1010094

Preparation and Characterization of Amphoteric Cellulose Hydrogels as Adsorbents for the Anionic Dyes in Aqueous Solutions

Department of Science and Engineering for Materials, Tomakomai National College of Technology, Tomakomai, Hokkaido 059 1275, Japan
Academic Editor: Andrij Pich
Received: 2 July 2015 / Revised: 6 August 2015 / Accepted: 19 August 2015 / Published: 24 August 2015
(This article belongs to the Special Issue Colloidal Gels as Micro- and Nanoreactors)
View Full-Text   |   Download PDF [2077 KB, uploaded 24 August 2015]   |  

Abstract

A series of cellulose ampholytes (CAms), with substitution degrees of cationic groups (DSC) of 0.41, 0.79, and 1.08, and with a substitution degree of anionic groups of 0.68, was prepared from sodium carboxymethylcellulose by a cationization reaction with 2,3-epoxypropyltrimethylammonium chloride. The obtained CAms were crosslinked by ethyleneglycoldiglycidylether (EGDE) to obtain cellulose polyampholyte hydrogels (CAmGs). The CAmGs adsorbed three anionic dyes, viz. AR9, AR13, and AB92, and the absorption depended on the DSC of the hydrogels and the pH of the adsorption medium: the maximum adsorption of anionic dyes occurred using CAmGs with higher DSC values, and under lower pH (less than 3) conditions. The adsorption of these dyes can be fitted by the Langmuir adsorption isotherm model, which revealed the maximum flocculation capacity of CAmGs for each dye. These encouraging results indicate that CAmGs may be applicable for use as novel adsorbents for wastewater treatment. View Full-Text
Keywords: amphoteric hydorogels; cellulose ampholyte; adsorption of dyes; kinetic analysis; adsorption isotherm amphoteric hydorogels; cellulose ampholyte; adsorption of dyes; kinetic analysis; adsorption isotherm
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kono, H. Preparation and Characterization of Amphoteric Cellulose Hydrogels as Adsorbents for the Anionic Dyes in Aqueous Solutions. Gels 2015, 1, 94-116.

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