title: Removal of uranyl ions in aquatic mediums by using a new material: gallocyanine grafted hydrogel.
abstract: A new material containing gallocyanine (GC) grafted polyacyril amide (PAA) was synthesized and its adsorption ability was examined for the removal of uranyl ions from aqueous media. The new developed adsorbent was characterized by FTIR, SEM, and PZC analysis. Adsorption of UO₂(2+) ions from aqueous solution as a function of ion concentration, pH, ionic strength, temperature, and reusability of adsorbent was investigated in detail. The adsorption data were analyzed by using the Langmuir, Freundlich and Dubinin-Radushkevich (DR) models. The adsorption of UO₂(2+) increased with pH and reached a plateau value in the pH range 5-6. The adsorption of UO₂(2+) ions were not affected by increasing ionic strength. The adsorption mechanism followed an endothermic and spontaneous process with increased disorderliness at adsorbate/adsorbent interface. The adsorption process followed a pseudo-second-order kinetics. The new developed material is a potential adsorbent for effective removal of uranyl ions from aquatic solutions.
authors.affiliation: Cumhuriyet University, Faculty of Pharmacy, Department of Analytical Chemistry, Sivas, Turkey. Electronic address: hiulusoy@yahoo.com.
authors.forename: Halil İbrahim
authors.initials: Hİ
authors.lastname: Ulusoy
authors.affiliation: Cumhuriyet University, Faculty of Sciences, Department of Chemistry, Sivas, Turkey.
authors.forename: Selçuk
authors.initials: S
authors.lastname: Şimşek
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000327:Adsorption; D020100:Hydrogels; D010078:Oxazines / Q000737:chemistry*; D014501:Uranium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014875:Water Pollutants, Radioactive / Q000737:chemistry*; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D020100:Hydrogels; D010078:Oxazines; D014501:Uranium; D014875:Water Pollutants, Radioactive; D000099166:Polyacrylamides; C007062:gallocyanine