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论文类型：期刊论文

发表时间：2012-03-17

发表刊物：CARBOHYDRATE POLYMERS

收录刊物：SCIE、EI

卷号：88

期号：1

页面范围：132-138

ISSN号：0144-8617

关键字：Cationic starch; Flocculation; Regeneration; Anionic dye; pH responsive

摘要：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.