Oshita Koji, Sabarudin Akhmad, Takayanagi Toshio, Oshima Mitsuko, Motomizu Shoji
Department of International Conservation Studies for Cultural Properties, Faculty of Cultural Properties, Kibi International University, 8 Iga-machi, Takahashi, Okayama 716-8508, Japan.
Talanta. 2009 Sep 15;79(4):1031-5. doi: 10.1016/j.talanta.2009.03.035. Epub 2009 Mar 26.
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).
制备了带有儿茶酚（儿茶酚型壳聚糖，1型和2型）、亚氨基二乙酸（IDA型壳聚糖）、亚氨基二甲膦酸（IDP型壳聚糖）、苯胂酸（苯胂酸型壳聚糖）或丝氨酸（丝氨酸型壳聚糖）的交联壳聚糖树脂，用于铀（VI）的收集和浓缩。采用柱法研究了U（VI）以及其他离子物种，如金属离子和含氧酸根离子，在交联壳聚糖（基体材料）和用螯合基团改性的壳聚糖树脂上的吸附行为。特别是，儿茶酚型壳聚糖（2型）在pH 2 - 7时吸附U（VI），并通过与引入壳聚糖的儿茶酚部分的羟基形成稳定螯合物，在酸性pH区域选择性收集U（VI）。此外，还阐明了水介质中存在的阳离子和阴离子物种的吸附特性。对U（VI）的吸附能力顺序为：儿茶酚型壳聚糖（2型）>丝氨酸型壳聚糖>苯胂酸型壳聚糖>其他。儿茶酚型壳聚糖（2型）可用于铀（VI）的收集和浓缩。
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