| Project/Area Number |
10558076
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Nuclear engineering
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| Research Institution | Chiba University |
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Principal Investigator |
SAITO Kyoichi Dept. of Materials Technol. Associate Professor, 工学部, 助教授 (90158915)
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| Co-Investigator(Kenkyū-buntansha) |
KUSHIDA Masato Dept. of Materials Technol. Assistant Researcher, 工学部, 助手 (70177989)
SUGITA Kazuyuki Dept. of Materials Technol. Professor, 工学部, 教授 (70009273)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥11,500,000 (Direct Cost: ¥11,500,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥9,200,000 (Direct Cost: ¥9,200,000)
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| Keywords | Seawater / Uranium / Vanadium / Adsorbents / Hydrophilic / Adsorption Rate / Floating-Contact Mode / Ocean Site |
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| Research Abstract |
Uranium is dissolved in seawater at a concentration of about 3 mg/m3 in the ionic form of uranyl tricarbonate ion. Atomic power plants continuously require uranium resources ; therefore, the 4.5 billion tons of total uranium in seawater will be essential for atomic power utilization. The amidoxime group has been selected as a promising group for uranium recovery from seawater ; the amidoxime group adsorbes uranyl species specifically from seawater, and the adsorbed uranyl ions are easily eluted with hydrochloric acid. To improve the adsorption rate of uranium, hydrophilic amidoxime fibers were prepared by cografting of methacrylic acid with acrylonitrile onto polypropylene or polyethylene fibers and subsequent conversion of the produced cyano group to an amidoxime group by reaction with hydroxylamine. The amount of uranium adsorbed in seawater was determined by means of a floating-contact mode. One hour of amidoximation provided an adsorbed amount of 1.7 g-U per kg of adsorbent after 60 days of contact. The amount of vanadium adsorbed was twice that of uranium.
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