Colloids and Surfaces A: Physicochemical and Engineering Aspects

Starch ampholytes (AmS) – cationic starch succinates – with the degree of substitution according tocationic groups of 0.29 or 0.36 and the degree of substitution according to anionic groups from 0.11 to0.34 were prepared by succinylation of precationized starch. FT-IR spectra confirmed the incorporationof carboxylic groups into the backbone of cationic starch. Scanning electron microscopy was used forevaluation of the granular structure and surface morphology of modified polysaccharides. The decreasein accessibility of cationic quaternary ammonium groups in AmS was detected by means of polyelec-trolyte titration. Colloidal dispersions of AmS were verified in the flocculation of kaolin suspensions andthe sedimentation of wastewater sludge. Their flocculation performance was studied in connection with measurements and compared with that ofcationic starch. The main advantage AmS appli-cation is broadening of the flocculation window. The mechanism of flocculation by starch ampholyteshas been proposed.© 2013 Elsevier B.V. All rights reserved.

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