title: Removal of 1-ethyl-3-methylimidazolium cations with bacterial biosorbents from aqueous media.
abstract: This study aims to determine whether biosorption can be used for the removal of ionic liquids (ILs), especially their cationic parts, from aqueous media. As a model IL, 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) was used. Five types of bacterial biosorbents were prepared from fermentation wastes through chemical modification of the bacterial surface. Screening study was performed to compare the cationic [EMIM] biosorption capacity among the bacterial biosorbents, indicating that the succinated Escherichia coli biomass (SB-E) was the best biosorbent for removing [EMIM] cations. The [EMIM] biosorption performance of SB-E was evaluated in detail through various experiments. The optimal pH range for [EMIM] biosorption was from 7 to 10, and biosorption equilibrium was reached within 10 min. The maximum uptake of SB-E was also estimated to be 72.6 mg/g. Moreover, [EMIM] cations were easily desorbed from [EMIM]-sorbed SB-E by adding acetic acid.
authors.affiliation: Department of BIN Fusion Technology, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea.
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Won
authors.forename: Sun Beom
authors.initials: SB
authors.lastname: Choi
authors.forename: Juan
authors.initials: J
authors.lastname: Mao
authors.forename: Yeoung-Sang
authors.initials: YS
authors.lastname: Yun
mesh_terms: D000327:Adsorption; D018533:Biomass; D019343:Citric Acid / Q000737:chemistry; D048230:Corynebacterium glutamicum; D004926:Escherichia coli; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D013387:Succinic Anhydrides / Q000737:chemistry; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D013387:Succinic Anhydrides; D014874:Water Pollutants, Chemical; D019343:Citric Acid; C031801:succinic anhydride; C518739:1-ethyl-3-methylimidazolium