title: Removal of heavy metal using poly (N-vinyl imidazole)-grafted-carboxymethylated starch.
abstract: Carboxymethyl starch (CMS) grafted with N-vinyl imidazole was investigated for heavy metal removal from aqueous solutions. Poly (N-vinyl imidazole)-grafted carboxymethyl starch (PVI-g-CMS) was prepared in aqueous solution using potassium persulfate (KPS) as initiator. The produced grafted copolymer was characterized by FTIR, TGA, surface area and elemental analysis. The grafted material was used for the sorption of Mn(II), Zn(II) and Cd(II). Uptake parameters such as affinity of metal ions, effect of metal ion concentration, adsorbent amount and agitation time were investigated. The polymers were more sensitive to Cd(II) and Zn(II) and the order of metal ion binding was Cd(II)>Zn(II)>Mn(II). The adsorption data was fitted very well in a Freundlich isotherm equation and the kinetics of adsorption was found to follow the pseudo-first order kinetic model.
authors.affiliation: Petrochemical Research Chair, Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; Department of Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt. Electronic address: helhamshary@ksu.edu.sa.
authors.forename: Hany
authors.initials: H
authors.lastname: El-Hamshary
authors.affiliation: Petrochemical Research Chair, Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; Textile Research Division, National Research Center, Dokki, Giza 12522, Egypt. Electronic address: m_gaballa@yahoo.com.
authors.forename: Moustafa M G
authors.initials: MM
authors.lastname: Fouda
authors.affiliation: Petrochemical Research Chair, Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
authors.forename: Meera
authors.initials: M
authors.lastname: Moydeen
authors.affiliation: Petrochemical Research Chair, Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
authors.forename: Salem S
authors.initials: SS
authors.lastname: Al-Deyab
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry*; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013213:Starch / Q000031:analogs & derivatives* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D007093:Imidazoles; D019216:Metals, Heavy; D011108:Polymers; D014874:Water Pollutants, Chemical; D013213:Starch; C034848:carboxymethyl starch; C425704:N-vinylimidazole
keywords: Carboxymethyl starch; Grafting; Heavy metals; N-Vinyl imidazole; Sorption