Journal
CARBOHYDRATE POLYMERS
Volume 80, Issue 2, Pages 467-473Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2009.12.002
Keywords
Cationic starch; Etherification; Mannich reaction; Hydroxymethyl dimethylamine hydrochloride; NMR; Flocculation
Categories
Funding
- National High Technology Research and Development Program of China [2006AA06Z317]
- Chang Jiang scholars and Innovative Research Team in the University [IRT0711]
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A new cationic starch ether - starch-methylene dimethylamine hydrochloride (SMMAHC) was synthesized by the reaction of corn starch with cationic reagent hydroxymethyl dimethylamine hydrochloride (HMMAHC) using dry process according to Mannich reaction. Reaction parameters (temperature, time, molar ratio of HMMAHC to anhydrous glucose unit (AGU) of starch, and content of HMMAHC) and their effects on the degree of substitution (DS) and reaction efficiency (RE) had been investigated. Under the optimal reaction conditions, SMMAHC with high DS of 0.79% and RE of 96.3% was obtained. The structures of SMMAHC were characterized by C-13-NMR and DEPT-135 spectroscopy. SMMAHC was used as flocculant to treat dyestuff (reactive brilliant red KE-3B) wastewater. The effects of DS and pH on the flocculation were studied and the dyestuff flocculation value reached a maximum of 209 mg/g. (c) 2009 Elsevier Ltd. All rights reserved.
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