Koji Oshita, Akhmad Sabarudin, Toshio Takayanagi, Mitsuko Oshima, Shoji Motomizu
Cross-linked chitosan resins with catechol (catechol-type chitosan, type 1 and type 2), iminodiacetic acid (IDA-type chitosan), iminodimetylphosphonic acid (IDP-type chitosan), phenylarsonic acid (phenylarsonic acid-type chitosan), or serine (serine-type chitosan) were prepared for the collection and concentration of uranium(VI). The adsorption behavior of U(VI) and other ionic species, such as metal ions and oxo-acid ions, on the cross-linked chitosan (base material) and chitosan resins modified with chelating moieties was examined using a column procedure. Especially, the catechol-type chitosan (type 2) adsorbed U(VI) at pH 2-7, and selectively collected U(VI) at acidic pH regions by forming a stable chelate with hydroxyl groups of catechol moiety introduced to the chitosan. Also, the adsorption properties of cationic and anionic species present in aquatic media were elucidated. The adsorption ability for U(VI) was in the order: catechol-type chitosan (type 2) > serine-type chitosan > phenylarsonic acid-type chitosan > the others. The catechol-type chitosan (type 2) was useful for the collection and concentration of uranium(VI). © 2009 Elsevier B.V. All rights reserved.
Department of International Conservation Studies for Cultural Properties, Faculty of Cultural Properties, Kibi International University, Takahashi, Okayama, 716-8508, 8 Iga-machi, Japan; Department of Chemistry, Faculty of Science, Brawijaya University, Malang, East Java 65145, MT Haryono 169, Indonesia; Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Department of Chemistry, Okayama 700-8530, 3-1-1 Tsushimanaka, Japan
