title: Synthesis of a novel ionic liquid modified copolymer hydrogel and its rapid removal of Cr (VI) from aqueous solution.
abstract: A novel ionic liquid modified copolymer hydrogel (PAMDA) was successfully synthesized by a simple water solution copolymerization using acrylamide (AM), dimethyldiallylammonium chloride (DADMAC) and ionic liquid (1-allyl-3-methylimidazolium chloride; [Amim]Cl) as copolymerization monomers. The structure and morphology of as-prepared copolymer hydrogel PAMDA were confirmed by Fourier transform infrared (FT-IR), field-emission scanning electron microscope (FE-SEM) and thermogravimetric analysis (TG). The copolymer hydrogel was applied as a novel adsorbent for the rapid removal of Cr (VI) from aqueous solution. The effects of several parameters such as the content of ionic liquid [Amim]Cl, solution pH, contact time, adsorbent dosage and initial Cr (VI) concentration on the adsorption were also investigated. The modification of [Amim]Cl significantly enhanced Cr (VI) adsorption. The adsorption equilibrium data fitted with Langmuir isotherm model better than Freundlich isotherm model. The maximum adsorption capacity for Cr (VI) ions was 74.5 mg L(-1) at 323 K based on Langmuir isotherm model. The removal rate could reach 95.9% within 10 min at 323 K and the adsorption process of Cr (VI) on PAMDA was well described by the pseudo-second-order kinetic model. The activation energy of adsorption was further investigated and found to be 1.094 kJ mol(-1), indicating the adsorption of Cr (VI) onto PAMDA was physisorption.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China. Electronic address: yms418@126.com.
authors.forename: Yinhua
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
authors.forename: Fan
authors.initials: F
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
authors.forename: Guibing
authors.initials: G
authors.lastname: Ding
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
authors.forename: Yecheng
authors.initials: Y
authors.lastname: Chen
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
authors.forename: Yuanzhi
authors.initials: Y
authors.lastname: Hong
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
authors.forename: Peipei
authors.initials: P
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
authors.forename: Xiuxiu
authors.initials: X
authors.lastname: Qi
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China.
authors.forename: Liang
authors.initials: L
authors.lastname: Ni
keywords: Copolymer hydrogel; Cr (VI); Ionic liquid modification; Rapid adsorption