title: Synthesis and characterization of uranyl ion-imprinted microspheres based on amidoximated modified alginate.
abstract: Surface ion-imprinting technique was utilized for the preparation of surface ion-imprinted chelating microspheres based on amidoximated modified alginate (U-AOX) in presence of uranyl ions as a template and glutaraldehyde cross-linker. Different instrumental techniques such as elemental analysis, scanning electron microscope (SEM), FTIR, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction spectra were employed for full investigation of the manufactured materials. The synthesized microspheres displayed a higher ability for selective extraction of UO2(2+) when compared to the non-imprinted microspheres (NI-AOX). In addition, the essential parameters such as pH, temperature, time and initial uranyl ion concentration were evaluated in order to optimize the conditions of the adsorption process. The results indicated that pH 5 was the best for the UO2(2+) removal, also, the adsorption was endothermic in nature, follows the second-order kinetics and the adsorption isotherm showed the best fit with Langmuir model with maximum adsorption capacity of 155 ± 1 and 64 ± 1 mg/g for both U-AOX and NI-AOX respectively. Desorption and regeneration had been carried out using 0.5M HNO3 solution and the results indicated that the microspheres maintained about 96% of its original efficiency after five consecutive adsorption-desorption cycles.
authors.affiliation: Chemistry Department, Deanery of Academic Services, Taibah University, Yanbu Branch, Yanbu El-Bahr, KSA; Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt. Electronic address: monierchem@yahoo.com.
authors.forename: M
authors.initials: M
authors.lastname: Monier
authors.affiliation: Chemistry Department, Deanery of Academic Services, Taibah University, Yanbu Branch, Yanbu El-Bahr, KSA; Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
authors.forename: D A
authors.initials: DA
authors.lastname: Abdel-Latif
authors.affiliation: Chemistry Department, Deanery of Academic Services, Taibah University, Yanbu Branch, Yanbu El-Bahr, KSA; Chemistry Department, Faculty of Science, El-Fayoum University, El-Fayoum, Egypt.
authors.forename: Hassan A
authors.initials: HA
authors.lastname: Mohammed
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D000577:Amides / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D008863:Microspheres; D008958:Models, Molecular; D054802:Molecular Imprinting; D056951:Photoelectron Spectroscopy; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D013997:Time Factors; D014501:Uranium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000464:Alginates; D000577:Amides; D006603:Hexuronic Acids; D007477:Ions; D011108:Polymers; D014501:Uranium; D020723:Glucuronic Acid
keywords: Acrylonitrile; Alginate; Amidoxime; Grafting; Ion-imprinting