Effect of crosslinker on the swelling and adsorption properties of cationic superabsorbent

Bulletin of materials science

GIRIDHAR MADRAS¹  TARUN SHARMA¹ 

[1] Department of Chemical Engineering, Indian Institute of Science, Bangalore 560 012, India$$Department of Chemical Engineering, Indian Institute of Science, Bangalore 560 012, IndiaDepartment of Chemical Engineering, Indian Institute of Science, Bangalore 560 012, India$$

关键词: Crosslinker;    hydrogels;    swelling;    adsorption;    kinetics.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

In the present study, superabsorbents (SAPs) of cationicmonomer [2-(methacryloyloxy) ethyl] trimethylammonium chloride have been prepared by free radical solution polymerization with different crosslinkers. They were subjected to repeated cycles of swelling and de-swelling in deionized water and NaCl solution. The conductivity of the swelling medium was measured and related to the swelling/de-swelling characteristics of the SAPs. The swelling capacity was also determined in saline solution. The swelling and de-swelling processes were described by first-order kinetics. The SAPs exhibited varied swelling capacity for crosslinkers of the same functionality as well as different functionality. The SAPs were used to adsorb the dye Orange G at different initial concentrations of the dye. The equilibrium adsorption data followed the Langmuir adsorption isotherms. The SAPs were also used to adsorb three other dyes, namely, Congo red, Amido black and Alizarin cyanine green. They exhibited different adsorption capacities for different dyes. The adsorption phenomenon was found to follow first-order kinetics.

【 授权许可】

Unknown