Alternative TitleStudies on the recovery of uranyl carbonate and the concentration of the isotopes using durable amino acid resins
Periodical title平成7(1995)年度 科学研究費補助金 一般研究(C) 研究成果報告書概要 = 1995 Fiscal Year Final Research Report Summary
Note (General)金沢大学工学部
1. 耐久性アミノ酸樹脂の合成と樹脂物性 アミノメチル化ポリスチレン樹脂を基体に,各種アミノ酸及び擬アミノ酸を活性エステル化法により導入した樹脂を15種合成した.アミノ酸導入量は2〜3.7mmol/g-樹脂であり,イオン交換容量,比重,含水率,IRなどの測定により,開発樹脂の物性を評価した.また,樹脂の酸洗浄,アルカリ浸漬,再使用性を検討し,耐久性の機能性樹脂であることを明らかにした.2.ウラン吸着容量と選択吸着機能 開発樹脂は炭酸ウラニル種に大きな吸着活性を示したが,ウラン平衡吸着量はGly,Arg樹脂で950mgU/g-樹脂以上となり,樹脂の高性能化を達成した.ウラン吸着速度は極めて速く,吸着等温式の解析によりジ炭酸種がLangmuir型吸着すると解釈された.プロトン付加したアミノ酸残基アミノ基が吸着の駆動力となると考えられるが,アミノ基に立体障害を有する擬アミノ酸の導入により,その機能を確認した.更に,炭酸濃度,海水マトリックス,移動相を用いたウランの漏出,溶離挙動を検討し,ウラン選択吸着樹脂であることを立証した.今後,繊維状吸着剤への発展が望まれる.3.ウラン同位体の分離濃縮挙動 バッチ法により,樹脂接触による天然ウランの同位体分離濃縮挙動を追跡した.α線測定により各樹脂の^<234>U/^<238>Uの分離係数を集積したが,高温条件(90℃)の炭酸種に明確に同位濃縮効果が発現することを見出した.また,アミド結合型より,エステル結合型樹脂の方が分離効果が大きく,樹脂内アミノ酸の酸化還元作用が濃縮加速因子となることが示唆された.ここで得た分離係数は,溶液内平衡による係数の300倍以上を示す樹脂もあった.^<235>U/^<238>Uの分離係数はICP-MS法により測定したが,測定誤差が大きく,全体として有意な評価は行えなかった.しかし,溶液内平衡の20倍以上を示す樹脂も見出したので,今後,効率の良い多段接触分離システムへの応用が待たれる.
1. Synthesis of durable amino acid resins and the resin properties : We have synthesized 15 types of amino acid resin, introducing amino acids or imitative amino acids into polystirene resin by the active esterification method. Amino acid contents introduced were estimated to be about 2-3.7 mmol/g-resin and the resin properties were evaluated by the measurement of ion exchange capacity, water content, FT-IR and etc.. We also investigated a washing effect with acids, alkali soaking and repeated use of the resins, and clarified that the developed resins were durable and functonal ones.2. Collection capacity of uranium and the selective adsorption function : The resins showed high adsorptive activity toward carbonate species of uranium. The equilibrium adsorption amounts were more than 950mg U/g-resin in Gly and Arg resins, and the high functionalization of amino acid resin was performed. The adsorption rate was exceedingly rapid and the mechanism was interpreted to be Langmuir type adsorption of dicarbonate uranyl species by the analysis of the adsorption isotherms. The protonated amino residue may behave as a driving force for adsorptions, whose function was confirmed by the introduction of iminative amino acids possessing steric hindrance in amino group. Effect of carbonate concentration and sea water matrixes, and the behaviors of break-through and elution using mobile phase were also examined, and the developed resins were proofed to be a selective adsorbent for uranium.3. Separation and concentration behaviors for uranium isotopes : The separation behaviors of natural uranium isotopes were traced by the resin contact using batch method. The separation factor (^<234>U/^<238>U) of each resin was accumulated by the measurement of alpha-ray. We found clearly that the isotope concentration effect largely emerged from the contact with carbonate species at high temperature condition (90ﾟC). The effect of ester-bonding type resins developed formerly was langer than that of amido-bonding types. It suggests that the oxidation-redox action of amino acid within the resin behaves as a acceleration factor of the separation. Some factors were 300 times or more against those of the equilibria in solution. Although the factiors of ^<235>U/^<238>U were measured by ICP-MS method, we could not perform wholly the meaning evaluation, due to large errors at the measurements. However, we found the resins possessing the factors 20 times or more against those of the solution equilibria. Accordingly, the developed resins can be expected for the application to the contact systems with multistage separations.
研究課題/領域番号:06680463, 研究期間(年度):1994 – 1995
出典：研究課題「耐久性アミノ酸樹脂を用いる炭酸ウラニル捕集と同位体分離濃縮に関する研究」課題番号06680463（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/report/KAKENHI-PROJECT-06680463/066804631995kenkyu_seika_hokoku_gaiyo/）を加工して作成
Related Materialhttps://kaken.nii.ac.jp/search/?qm=40019758
https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-06680463/
https://kaken.nii.ac.jp/ja/report/KAKENHI-PROJECT-06680463/066804631995kenkyu_seika_hokoku_gaiyo/
Data Provider (Database)国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）