Cationic hemicellulose-based hydrogels for arsenic and chromium removal from aqueous solutions

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Daniel Dax, María Soledad Chávez, Chunlin Xu, Stefan Willför, Regis Teixeira Mendonça, Julio Sánchez
Publisher: ELSEVIER SCI LTD
Publication year: 2014
Journal: Carbohydrate Polymers
Journal acronym: CARBOHYD POLYM
Volume number: 111
Start page: 797
End page: 805
Number of pages: 9
ISSN: 0144-8617
eISSN: 1879-1344


Abstract

In this work the synthesis of hemicellulose-based hydrogels and their application for the removal of arsenic and chromium ions is described. In a first step O-acetyl galactoglucomannan (GGM) was subjected to a transesterification applying glycidyl methacrylate (GMA) for the synthesis of novel GGM macromonomers. Two distinguished and purified GGM fractions with molar mass of 7.1 and 28 kDa were used as starting materials. The resulting GGM macromonomers (GGM-MA) contained well-defined amounts of methacrylate groups as determined by H-1 NMR spectroscopy. Selected GGM-MA derivatives were consecutively applied as a crosslinker in the synthesis of tailored hydrogels using [2-(methacryloyloxy)ethyl]trimethylammonium chloride (MeDMA) as monomer. The swelling rate of the hydrogels was determined and the coherence between the swelling rate and the hydrogel composition was examined. The morphology of the GGM-based hydrogels was analysed by SEM and the hydrogels revealed a high surface area and were assessed in respect to their ability to remove arsenate and chromate ions from aqueous solutions. The presented bio-based hydrogels are of high interest especially for the mining industries as a sustainable material for the treatment of their highly contaminated wastewaters.


Keywords

Crosslinking, Hemicellulose, Hydrogels, O-Acetyl galactoglucomannan, Polysaccharide, Wastewater treatment

Last updated on 2019-23-07 at 05:00