Development of Starch –Based Cationic Adsorbents for Removal of Anionic Dyes from Aqueous Systems

Amal A. Aly; Aly A. Hebeish

Volume : IV, Issue : VIII, August - 2015

Development of Starch –Based Cationic Adsorbents for Removal of Anionic Dyes from Aqueous Systems

Amal A. Aly, Aly A. Hebeish

Abstract :

Three cationic starch derivatives containing quaternary ammonium salt were prepared, including starch–2–hydroxy propyl–trimethyl ammonium chlorid , starch–2–hydroxy propyl–triethyl ammonium chloride and starch–2–hydroxy propyl–tripropyl ammonium chloride. They having different chain length of the alkyl moiety. The essential target for such preparation is to ing into focus adsorbents which completely can remove anionic dyes, e.g., acid dyes from aqueous systems thereby improving the quality of water. Chemical changes in the molecular structure of starch by derivatization through cationization were monitored using FTIR, while morphological changes were detected using SEM. These derivatives were treated with four acid dyes: Methyl Orange, Yellow 2G, Acid red 27 and Methyl blue, which have different number of sulfonic group and different molecular weight. Factors affecting % of the dye removal were studied which, include structural nature of the dye (number of sulphonic group and molecular weight), chain length of the alkyl moiety of cationic starch, amine content, adsorbent dose, dye concentration, pH of the treating bath, duration of the treatment and agitation speed. According to the % of dye removal the starch–based adsorbents follow the order: Starch–2–hydroxy propyl–trimethyl ammonium chloride > Starch–2–hydroxy propyl–triethyl ammonium chloride > Starch–2–hydroxy propyl–tripropyl ammonium chloride and Methyl Orange > Yellow 2G > Acid red 27 > Methyl blue.