title: Preparation and application of attapulgite/iron oxide magnetic composites for the removal of U(VI) from aqueous solution.
abstract: Recently, magnetic sorbents have received considerable attention because of their excellent segregative features and sorption capacities. Herein, attapulgite/iron oxide magnetic (ATP/IOM) composites were prepared and characterized. The sorption results indicated that ATP/IOM composites were superior to ATP and iron oxides individually for the removal of U(VI) from aqueous solution. Based on X-ray photoelectron spectroscopy (XPS) analysis and surface complexation model, the main sorption species of U(VI) on ATP were==X(2)UO(2)(0) below pH 4.0 and==S(s)OUO(2)(+), ==S(w)OUO(2)CO(3)(-), and==S(w)OUO(2)(CO(3))(2)(3-) above pH 5.0. However the prevalent species on ATP/IOM composites were==S(s)OUO(2)(+) and==S(w)OUO(2)(CO(3))(2)(3-) over the observed pH range. ATP/IOM composites are a promising candidate for pre-concentration and immobilization of radionuclides from large volumes of aqueous solutions, as required for remediation purposes.
authors.affiliation: Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, Gansu 73000, China.
authors.forename: Qiao-Hui
authors.initials: QH
authors.lastname: Fan
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Yun-Fei
authors.initials: YF
authors.lastname: Chen
authors.forename: Wang-Suo
authors.initials: WS
authors.lastname: Wu
mesh_terms: D000255:Adenosine Triphosphate / Q000737:chemistry; D000327:Adsorption; D005290:Ferric Compounds / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions; D017616:Magnesium Compounds / Q000032:analysis*; D008280:Magnetics; D008956:Models, Chemical; D011848:Radioactive Pollutants / Q000032:analysis; D011868:Radioisotopes / Q000302:isolation & purification; D017655:Silicon Compounds / Q000032:analysis*; D013499:Surface Properties; D014501:Uranium / Q000032:analysis / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D007477:Ions; D017616:Magnesium Compounds; D011848:Radioactive Pollutants; D011868:Radioisotopes; D017655:Silicon Compounds; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D014501:Uranium; D000255:Adenosine Triphosphate; C026325:attapulgite