title: Efficient adsorption of 1-alkyl-3-methylimidazolium chloride ionic liquids onto modified cellulose microspheres.
abstract: A novel sulfonated cellulose microsphere adsorbent (CGS) was prepared by pre-irradiation induced emulsion grafting of glycidyl methacrylate (GMA) onto the cellulose microsphere, followed by sulfonation. The resulting CGS exhibited superior adsorption ability toward 1-alkyl-3-methylimidazolium chloride ([CnMIM]Cl) ionic liquids (ILs). The adsorption equilibrium could be attained rapidly within 40 min for representative 1-butyl-3-methylimidazolium chloride ([C4MIM]Cl) using CGS with different amounts of SO3H group. The adsorption behavior of CGS toward [C4MIM]Cl was well described by the pseudo-second-order model and the Langmuir model. The maximum adsorption capacity toward [C4MIM]Cl was 1.08 mmol/g in the wide range of pH (4.8-10.1). In addition, the adsorption capacity of CGS toward [CnMIM]Cl increased with the alkyl length of cations of [CnMIM]Cl due to the hydrophobic interaction and cation exchange adsorption. Spent CGS could be easily regenerated by 0.1 mol/L HCl or NaCl. The results indicated that this new adsorbent is useful in removing ILs from wastewater.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Min
authors.initials: M
authors.lastname: Xu
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Yinyong
authors.initials: Y
authors.lastname: Ao
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Shuojue
authors.initials: S
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. Electronic address: jpeng@pku.edu.cn.
authors.forename: Jing
authors.initials: J
authors.lastname: Peng
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Jiuqiang
authors.initials: J
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. Electronic address: mlzhai@pku.edu.cn.
authors.forename: Maolin
authors.initials: M
authors.lastname: Zhai
mesh_terms: D000327:Adsorption; D002482:Cellulose / Q000737:chemistry*; D004852:Epoxy Compounds / Q000737:chemistry; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry; D008863:Microspheres; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D004852:Epoxy Compounds; D007093:Imidazoles; D052578:Ionic Liquids; D008689:Methacrylates; D014874:Water Pollutants, Chemical; C502841:1-butyl-3-methylimidazolium chloride; D002482:Cellulose; C007870:glycidyl methacrylate
keywords: 1-Butyl-3-methylimidazolium chloride (PubChem CID: 2734161); 1-Ethyl-3-methylimidazolium chloride (PubChem CID: 2734160); 1-Hexyl-3-methylimidazolium chloride (PubChem CID: 2734163); 1-Octyl-3-methylimidazolium chloride (PubChem CID: 2734223); Adsorption; Cellulose microsphere; Emulsion grafting; Glycidyl methacrylate (PubChem CID: 7837); Ionic liquid; Pre-irradiation