Post functionalization of carboxymethylated starch and acrylonitrile based networks through amidoximation for use as ion sorbents

• Published in: Carbohydrate polymers 2006-11, Vol.66 (4), p.435-443
• Main Authors: Chauhan, Ghanshyam S., Jaswal, Saroj Chauhan, Verma, Monika
• Format: Article
• Language: English
• Subjects: Acrylonitrile; Amidoxime and ion sorption; Applied sciences; biopolymers; Carboxymethylation; chemical structure; crosslinking; duration; Exact sciences and technology; Fourier transform infrared spectroscopy; heavy metals; hydrocolloids; ionic strength; ions; iron; modified starch; Natural polymers; nitrogen; Physicochemistry of polymers; sorption; spectral analysis; Starch and polysaccharides; temperature; water uptake
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2006.03.030

Carboxymethylation of starch provided carboxymethyl starch (CMS) and the modification was followed by grafting CMS with acrylonitrile (AN) using ammonium per sulphate- N, N, N, N-tetramethylethylene diamine as initiator–accelerator system. Crosslinked networks of CMS and AN were obtained using two crosslinkers, viz., N, N-methylenebisacrylamide and ethyleneglycoldimethacrylate. The networks were further reacted with hydroxylamine to generate metal ion active amidoxime groups. The synthesized hydrogels were characterized by FTIR, SEM, nitrogen analysis and swelling studies to evaluate water uptake and the candidate polymers were used as matrices for the sorption of Fe 2+ ions, as a model metal ion, as a function of time, temperature, pH and ionic strength. An attempt was made to investigate the thermodynamics of its sorption behaviour.