Synthesis and characterization of humic acid immobilized-polymer/bentonite composites and their ability to adsorb basic dyes from aqueous solutions

被引:75
作者
Anirudhan, T. S. [1 ]
Suchithra, P. S. [1 ]
Radhakrishnan, P. G. [1 ]
机构
[1] Univ Kerala, Dept Chem, Trivandrum 695581, Kerala, India
关键词
Humic acid; Polymer/clay composite; Dye adsorption; Isotherm; Regeneration; POLYACRYLAMIDE-BENTONITE; MALACHITE-GREEN; METHYLENE-BLUE; ADSORPTION; REMOVAL; WASTE;
D O I
10.1016/j.clay.2008.09.015
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A new polyacrylamide-bentonite composite with amine functionality (Am-PAA-B) was prepared by direct polymerization in the presence of N,N'-methylenebisacrylamide as a crosslinking agent and potassium peroxydisulphate as an initiator followed by reaction with ethylenediammine. The Am-PAA-B was modified by immobilizing humic acid and tested as an adsorbent to remove basic dyes (Malachite Green, Methylene Blue and Crystal Violet) from aqueous solutions. XRD, conductometric and potentiometric titrations were used to characterize the adsorbent. The adsorbent behaved like a cation exchanger and more than 99.0% removal of dyes was observed at the pH range 5.0 to 8.0. The adsorption kinetic data were interpreted by pseudo-second-order rate equation and the film diffusion was the rate-limiting step. The equilibrium data were fitted well with the Freundlich isotherm model. Desorption of dyes was achieved by treatment with 0.1 M HNO3 and four adsorption desorption cycles were performed without significant decrease in adsorption capacity. (C) 2008 Elsevier B.V. All rights reserved
引用
收藏
页码:336 / 342
页数:7
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