Investigation on efficient adsorption of cationic dyes on porous magnetic polyacrylamide microspheres

Journal of Hazardous Materials
Tong YaoLixiong Zhang

Abstract

We report here the preparation of porous magnetic polyacrylamide microspheres for efficient removal of cationic dyes by a simple polymerization-induced phase separation method. Characterizations by various techniques indicate that the microspheres show porous structures and magnetic properties. They can adsorb methylene blue with high efficiency, with adsorption capacity increasing from 263 to 1977 mg/g as the initial concentration increases from 5 to 300 mg/L. Complete removal of methylene blue can be obtained even at very low concentrations. The equilibrium data is well described by the Langmuir isotherm models, exhibiting a maximum adsorption capacity of 1990 mg/g. The adsorption capacity increases with increasing initial pH and reaches a maximum at pH 8, revealing an electrostatic interaction between the microspheres and the methylene blue molecules. The microspheres also show high adsorption capacities for neutral red and gentian violet of 1937 and 1850 mg/g, respectively, as well as high efficiency in adsorption of mixed-dye solutions. The dye-adsorbed magnetic polyacrylamide microspheres can be easily desorbed, and can be repeatedly used for at least 6 cycles without losing the adsorption capacity. The adsorption capacit...Continue Reading

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Citations

Sep 26, 2015·Journal of Colloid and Interface Science·Jianwei FuQun Xu
Jan 3, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Meng-Jung TsaiJing-Yun Wu
Mar 24, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Xiao-Shui LiShi-Hua Qi
Dec 5, 2017·Environmental Science and Pollution Research International·Kangying GuoYan Wang
Mar 25, 2019·International Journal of Biological Macromolecules·Umma HabibaAmalina M Afifi

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