海水ウラン採取に用いる球状アミドキシム型繊維吸着剤の調製およびそのウラン吸着性  [in Japanese] Preparation of Spherically Formed Fibers Containing Amidoxime Groups and Their Ability to Adsorb Uranium in Seawater  [in Japanese]

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Abstract

海流, 波力等の自然エネルギーを直接利用する海水ウラン採取システムに用いる吸着剤として球状アミドキシム型繊維 (球状AO-繊維) 吸着剤を開発した. 球状AO-繊維の製造条件および球状AO-繊維の調製条件とその物理化学的性質およびウラン吸着性との関係について検討し, つぎの結果を得た.<BR>1) 固液比, アスペクト比, 攪拌速度を制御することにより, 高収率でかつ再現性よく8~13mmの球径をもつ球状AO-繊維を調製できる.<BR>2) 球状AO-繊維の含水量および見かけ密度は攪拌時間でおもに決まる.<BR>3) 球状AO-繊維はアルカリ処理による解繊率を1%以下に抑えるため, T<SUB>AO</SUB>が長くなるとT<SUB>A1</SUB>を短くする必要がある.<BR>4) 球状AO-繊維のウラン吸着速度はT<SUB>s</SUB>とともに減少するが, T<SUB>AO</SUB>=8h, T<SUB>s</SUB>=5h, およびT<SUB>A1</SUB>=8hで得た球状AO-繊維は同条件 (T<SUB>AO</SUB>=8h, T<SUB>A1</SUB>=8h) で得た未成形のAO-繊維とほぼ同等のウラン吸着速度 (21日間で0.72mg/g) を示す.<BR>5) 球状AO-繊維に吸着したウランは低濃度の塩酸で短時間で効率よく脱着できる.

By stirring polyacrylonitrile fibers with a length of 5mm and a diameter of 5 deniers in a methanolic solution of hydroxylamine, spheres having amidoxime groups (AO-spheres) have successfully been formed. The resulting spheres have well-controlled diameters (0.8-1.3cm) and apparent densities (0.1-0.2g/cm<SUP>3</SUP>). The yield of AO-spheres depends on the stirring speed, the ratio of the fiber weight to the solution volume, and the fiber length. The water content and apparent density of AO-spheres are affected predominantly by the stirring time (T<SUB>s</SUB>). The shape stability of AO-spheres in 1M NaOH-5% NaCl correlates with the treatment time with 1M hydroxylamine (T<SUB>AO</SUB>); the treatment time with the alkaline solution (T<SUB>A1</SUB>) for the loss of fibers less than 1wt% is less than 24h for AO-spheres obtained with T<SUB>AO</SUB>=2h, less than 16h for those with T<SUB>AO</SUB>=4h,and less than 8h for those with T<SUB>AO</SUB>=8h. Adsorption rates of uranium on AO-spheres from seawater exhibit constant maximums for T<SUB>s</SUB><5h and decrease with an increase in T<SUB>s</SUB>>5h, due tothe greater difficulty of uranium diffusion into AO-spheres prepared under T<SUB>s</SUB>>5h. The AO-spheres obtained under the condition of T<SUB>s</SUB>=5h, T<SUB>AO</SUB>=8h, and T<SUB>A1</SUB>=8h show the adsorptivity toward uranium in seawater of 0.72mg/g after 21days, which is almost equal to that with nonformed AO-fibers. Uranium on AO-spheres is readily eluted with 1M HCl

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 50(1), 3-12, 1996-01-31

    The Society of Sea Water Science, Japan

References:  10

  • <no title>

    加藤俊作

    日化誌 1982, 1449

    Cited by (2)

  • <no title>

    加藤俊作

    日化誌 1982, 1455

    Cited by (2)

  • <no title>

    信川寿

    日本造船学会論文集 165, 281, 1989

    Cited by (7)

  • <no title>

    信川寿

    日本造船学会論文集 168, 321, 1990

    Cited by (6)

  • <no title>

    信川寿

    日本造船学会論文集 172, 519, 1992

    Cited by (6)

  • <no title>

    SAKANE K.

    Int. Meet. on Recovery of Uranium from Seawater 129, 1983

    Cited by (4)

  • <no title>

    高木憲夫

    海水誌 42, 279, 1989

    Cited by (6)

  • <no title>

    TAKAGI N.

    Proc. ICIE 549, 1991

    Cited by (3)

  • <no title>

    坂根幸治

    海水学会第34年会講演要旨集 7, 1983

    Cited by (1)

  • <no title>

    高木憲夫

    海水誌 36, 374, 1983

    Cited by (3)

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008279861
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03694550
  • NDL Article ID
    3924623
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山) // ZP8(科学技術--化学・化学工業--無機化学・無機化学工業)
  • NDL Call No.
    Z15-47
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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