title: Collagen/cellulose hydrogel beads reconstituted from ionic liquid solution for Cu(II) adsorption.
abstract: A novel adsorbent, biodegradable collagen/cellulose hydrogel beads (CCHBs), was prepared by reconstitution from a 1-butyl, 3-methylimidazolium chloride ([C4mim]Cl) solution. The adsorption properties of the CCHBs for Cu(II) ion removal from aqueous solutions were investigated and compared with those of cellulose hydrogel beads (CHBs). The CCHBs have a three-dimensional macroporous structure whose amino groups are believed to be the main active binding sites of Cu(II) ions. The equilibrium adsorption capacity (qe) of the CCHBs is greatly influenced by the collagen/cellulose mass ratio, and steeply increases until the collagen/cellulose mass ratio exceeds 2/1. The maximum adsorption is obtained at pH 6. The qe of Cu(II) ions increases with increased initial concentration of the solution. Based on Langmuir isotherms, the maximum adsorption capacity (qm) of CCHB3 (collagen/cellulose mass ratio of 3/1) is 1.06 mmol/g. The CCHBs maintain good adsorption properties after the fourth cycle of adsorption-desorption.
authors.affiliation: School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
authors.forename: Jilei
authors.initials: J
authors.lastname: Wang
authors.forename: Ligang
authors.initials: L
authors.lastname: Wei
authors.forename: Yingchong
authors.initials: Y
authors.lastname: Ma
authors.forename: Kunlan
authors.initials: K
authors.lastname: Li
authors.forename: Minghui
authors.initials: M
authors.lastname: Li
authors.forename: Yachen
authors.initials: Y
authors.lastname: Yu
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Huihui
authors.initials: H
authors.lastname: Qiu
mesh_terms: D000327:Adsorption; D002482:Cellulose / Q000737:chemistry*; D003094:Collagen / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D008863:Microspheres; D012996:Solutions; D013997:Time Factors
chemical_list: D020100:Hydrogels; D007093:Imidazoles; D052578:Ionic Liquids; D012996:Solutions; C502841:1-butyl-3-methylimidazolium chloride; D003300:Copper; D002482:Cellulose; D003094:Collagen
keywords: Adsorption; Cellulose; Collagen; Cu(II); Ionic liquid