title: Phosphorylation of chitosan/HEMA interpenetrating polymer network prepared by γ-radiation for metal ions removal from aqueous solutions.
abstract: Interpenetrating polymer network (IPN) hydrogels, based on chitosan (CS) and 2-hydroxyethyl methacrylate (HEMA), have been prepared by γ-radiation followed by chemical modification via phosphorylation reaction and used for adsorption of Ca(II), Cu(II) and Zn(II) ions from their aqueous solutions. The gel content (%) increases with increasing the HEMA concentration. The maximum swelling (%) observed at the ratio (70/30) (CS/HEMA). CS/pHEMA IPN showed a higher thermal stability than CS. The phosphorylated hydrogel, Phos-(CS/pHEMA), characterized by XRD, EDS, SEM, DSC and TGA techniques. FT-IR spectra before and after adsorption of metal ions have been studied. Factors affecting the maximum adsorption capacity were also investigated. The maximum adsorption capacity using 0.01g Phos-(CS/pHEMA) was 66.3, 57.6 and 48.7 (mg/g) for Cu(II), Zn(II) and Ca(II) ions, respectively. The adsorption isotherms were simulated by Langmuir and Freundlich models and the adsorption kinetics were simulated by the pseudo-first-order and pseudo-second-order kinetics. The adsorption follows Langmuir models and pseudo-second order. The IPN hydrogels showed effective adsorption of the three metal ions from aqueous solution.
authors.affiliation: Radiation Research of Polymer Chemistry Dept., National Center for Radiation Research and Technology, Atomic Energy Authority, P.O. Box: 29 Nasr City, Cairo, Egypt. Electronic address: amelbarbary@yahoo.com.
authors.forename: Ahmed M
authors.initials: AM
authors.lastname: Elbarbary
authors.affiliation: Radiation Research of Polymer Chemistry Dept., National Center for Radiation Research and Technology, Atomic Energy Authority, P.O. Box: 29 Nasr City, Cairo, Egypt.
authors.forename: Mohamed Mohamady
authors.initials: MM
authors.lastname: Ghobashy
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D005720:Gamma Rays; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000302:isolation & purification*; D007700:Kinetics; D008670:Metals / Q000302:isolation & purification*; D008689:Methacrylates / Q000737:chemistry*; D010766:Phosphorylation; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D007477:Ions; D008670:Metals; D008689:Methacrylates; D011108:Polymers; D012996:Solutions; D014874:Water Pollutants, Chemical; C005044:hydroxyethyl methacrylate; D048271:Chitosan
keywords: Adsorption; Chitosan; HEMA; Hydrogel; Metal ions; Phosphorylation; Radiation