title: High-strength hydrogel as a reusable adsorbent of copper ions.
abstract: A mechanically strong hydrogel was prepared by photoinitiated polymerization of oligo(ethylene glycol) methacrylate (OEGMA), 2-vinyl-4,6-diamino-1,3,5-triazine (VDT) and cross-linker N,N'-methylenebisacrylamide (MBAA). Introduction of the monomer VDT considerably strengthened the mechanical properties of the hydrogel by self-hydrogen bonding of diaminotriazine, and enhanced the adsorption of copper ion onto the hydrogel by chelation between amino groups and metal ion. Adsorption studies were carried out by varying the OEGMA/VDT ratio, contact time, pH value, counterion and initial concentration of Cu(2+) ions. The evaluation of adsorption properties showed that the hydrogel exhibited better correlation with Langmuir isotherm model. This adsorbent could be used repeatedly with little loss in adsorption capacity.
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, PR China.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.forename: Yanjiao
authors.initials: Y
authors.lastname: Han
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.forename: Tao
authors.initials: T
authors.lastname: Bai
authors.forename: Han
authors.initials: H
authors.lastname: Gao
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Wenguang
authors.initials: W
authors.lastname: Liu
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D000327:Adsorption; D000465:Algorithms; D003300:Copper / Q000737:chemistry*; D003432:Cross-Linking Reagents; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007477:Ions; D055595:Mechanical Phenomena; D008689:Methacrylates / Q000737:chemistry; D010777:Photochemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D059027:Recycling; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014227:Triazines / Q000737:chemistry; D014753:Vinyl Compounds / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: C500826:2-vinyl-4,6-diamino-1,3,5-triazine; D000178:Acrylamides; D003432:Cross-Linking Reagents; D020100:Hydrogels; D007202:Indicators and Reagents; D007477:Ions; D008689:Methacrylates; D014227:Triazines; D014753:Vinyl Compounds; C524499:polyethylene glycol methacrylate; D014867:Water; D011092:Polyethylene Glycols; D003300:Copper; C021221:N,N'-methylenebisacrylamide