title: Separation of copper ions from iron ions using PVA-g-(acrylic acid/N-vinyl imidazole) membranes prepared by radiation-induced grafting.
abstract: Acrylic acid (AAc), N-vinyl imidazole (Azol) and their binary mixtures were graft copolymerized onto poly(vinyl alcohol) membranes using gamma irradiation. The ability of the grafted membranes to separate Cu ions from Fe ions was investigated with respect to the grafting yield and the pH of the feed solution. The data showed that the diffusion of copper ions from the feed compartment to the receiver compartment depends on the grafting yield of the membranes and the pH of the feed solution. To the contrary, iron ions did not diffuse through the membranes of all grafting yields. However, a limited amount of iron ions diffused in strong acidic medium. This study shows that the prepared membranes could be considered for the separation of copper ions from iron ions. The temperature of thermal decomposition of pure PVA-g-AAc/Azol membrane, PVA-g-AAc/Azol membrane containing copper ions, and PVA-g-AAc/Azol membrane containing iron ions were determined using TGA analyzer. It was shown that the presence of Cu and Fe ions increases the decomposition temperature, and the membranes bonded with iron ions are more stable than those containing copper ions.
authors.affiliation: Polymer Technology Division, Department of Radiation Technology, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria. scientific@aec.org.sy
authors.forename: Zaki
authors.initials: Z
authors.lastname: Ajji
authors.forename: Ali M
authors.initials: AM
authors.lastname: Ali
mesh_terms: D003300:Copper / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry* / Q000528:radiation effects*; D007202:Indicators and Reagents; D007501:Iron / Q000737:chemistry*; D008567:Membranes, Artificial; D011142:Polyvinyl Alcohol / Q000737:chemistry* / Q000528:radiation effects*; D013696:Temperature; D013818:Thermogravimetry
chemical_list: D007093:Imidazoles; D007202:Indicators and Reagents; D008567:Membranes, Artificial; D003300:Copper; D011142:Polyvinyl Alcohol; D007501:Iron; C425704:N-vinylimidazole