Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-03-17

Journal: CARBOHYDRATE POLYMERS

Included Journals: EI、SCIE

Volume: 88

Issue: 1

Page Number: 132-138

ISSN: 0144-8617

Key Words: Cationic starch; Flocculation; Regeneration; Anionic dye; pH responsive

Abstract: We designed a new tertiary amine starch ether (2,4-bis(dimethylamino)-[1,3,5]-triazine-6-yl)-starch (BDATS) via etherification of starch with 2,4-bis(dimethylamino)-6-chloro-[1,3,5]-triazine (BDAT), which demonstrated a reversible pH response in aqueous solution. BOATS could be utilized as an effective flocculant because of its favorable interaction with anionic dyes. The flocculation was solution pH dependent and that color removal as high as 97% was possible at pH 2. BDATS shows high flocculation capacity, with the maximum flocculation capacity (DS = 0.63) at 1158 mg g(-1) for C.I. Reactive Red 141,873 mg g(-1) for C.I. Acid Red 1 and 2296 mg g(-1) for C.I. Acid Blue 324, respectively. The theoretical flocculation capacity was calculated, and the results showed that the experimental flocculation capacity was near to the theoretical one. At pH 8, the dye-loaded flocculant could be regenerated and the recovery ratio of the flocculant was 80%. After five cycles of flocculation/regeneration, color removal ratio was still above 94%. BDATS made it a good candidate for an effective re-cycled flocculant for the treatment of colored effluents. (C) 2011 Published by Elsevier Ltd.