Adsorption Behaviors of Acid Dyes by Water-Insoluble Crosslinked Cationic Starch

Abstract:

This paper presents a study on the adsorption of structurally different C.I. Acid Red 1(AR-1) and C.I. Acid Yellow 4(AY-4) from aqueous solution by a series water-insoluble crosslinked cationic starches with different degrees of substitution (DS) synthesized by a dry process. The adsorption quickly establish equilibrium within 15 min. The effective adsorption took place at the initial pH of 2-10 and pH of 2-8 for AR-1 and AY-4, respectively. The adsorption capacity of the two acid dyes increased with the increasing of DS of the crosslinked cationic starches. The adsorption capacity of AY-4 was almost two times higher than that of AR-1 under the present conditions. It was found that the adsorption kinetics of the two acid dyes on the crosslinked cationic starch was well described with the pseudo-second-order model (R²>0.99). Further, the Langmuir isotherm agreed well with the experimental data (R²>0.99). Besides, the thermodynamic parameters are shown.

• Periodical: Applied Mechanics and Materials (Volumes 522-524)
• Pages: 552-559
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.522-524.552
• Online since: February 2014
• Authors: Min Zhang*, Ben Zhi Ju, Shu Fen Zhang, Xue Zhang, Zhi Hua Cui
• Keywords: Acid Dyes, Adsorption, Crosslinked Cationic Starch, Water-Insoluble

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