title: Removal of anionic azo dyes from aqueous solution by functional ionic liquid cross-linked polymer.
abstract: A novel functional ionic liquid based cross-linked polymer (PDVB-IL) was synthesized from 1-aminoethyl-3-vinylimidazolium chloride and divinylbenzene for use as an adsorbent. The physicochemical properties of PDVB-IL were investigated by Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The adsorptive capacity was investigated using anionic azo dyes of orange II, sunset yellow FCF, and amaranth as adsorbates. The maximum adsorption capacity could reach 925.09, 734.62, and 547.17 mg/g for orange II, sunset yellow FCF and amaranth at 25°C, respectively, which are much better than most of the other adsorbents reported earlier. The effect of pH value was investigated in the range of 1-8. The result shows that a low pH value is found to favor the adsorption of those anionic azo dyes. The adsorption kinetics and isotherms are well fitted by a pseudo second-order model and Langmuir model, respectively. The adsorption process is found to be dominated by physisorption. The introduction of functional ionic liquid moieties into cross-linked poly(divinylbenzene) polymer constitutes a new and efficient kind of adsorbent.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China; Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637000, China.
authors.forename: Hejun
authors.initials: H
authors.lastname: Gao
authors.forename: Taotao
authors.initials: T
authors.lastname: Kan
authors.forename: Siyuan
authors.initials: S
authors.lastname: Zhao
authors.forename: Yixia
authors.initials: Y
authors.lastname: Qian
authors.forename: Xiyuan
authors.initials: X
authors.lastname: Cheng
authors.forename: Wenli
authors.initials: W
authors.lastname: Wu
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Wang
authors.forename: Liqiang
authors.initials: L
authors.lastname: Zheng
mesh_terms: D000327:Adsorption; D000548:Amaranth Dye / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry; D007700:Kinetics; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D007093:Imidazoles; D052578:Ionic Liquids; D012996:Solutions; D014874:Water Pollutants, Chemical; D000548:Amaranth Dye; C005842:6-hydroxy-5-((p- sulfophenyl)azo)-2-naphthalenesulfonic acid disodium salt; C014722:2-naphthol orange
keywords: Adsorption; Azo dye; Ionic liquid; Polymers