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Katakai, Akio; Tamada, Masao; Nagamoto, Hiroyuki*; Miyagawa, Hiroshi*
Nihon Ion Kokan Gakkai-Shi, 16(2), p.122 - 126, 2005/05
A chelating fiber containing an amidoxime group as a chelate-forming group was prepared by radiation-induced cograft polymerization of acrylonitrile and methacrylic acid and subsequent conversion of the produced cyano group into the amidoxime group. The effect of repeated use of monomers for radiation-induced graft copolymerization on the composition of the graft chain and its adsorption capacity for metal ions was determined. The degree of cografting decreased by as low as 10% at the fourth cycle of cografting, compared with an initial degree of cografting of 170%, because the amount of homopolymer formed in cografting was negligibly small at 0.15 g/L of the monomer solution. The repeated use of monomers did not affect the amidoxime group density and the adsorption capacities of zinc and cadmium ions, resulting in the cost reduction of the preparation of the chelating fiber.
Tamada, Masao
Enerugi Rebyu, 22(4), p.24 - 26, 2002/03
The Black Current conveys 5.2 million tons of uranium toward the offing of Japan, though uranium concentration is only 3.3 ppb in seawater. Recovery of 0.2% of this resources can supply the uranium for all atomic power plants in Japan. Graft polymerization is a promising technique to prepare adsorbent having high selectivity to uranium in seawater and enough durability in severe sea conditions. To evaluate the activity of the adsorbents the equipment for the recovery of rare metals from seawater was set at the 7 km offing of Mutsu-Sekine, Aomori prefecture on September, 1999. In three years (1999 - 2001) 9 mooring experiments of adsorbents were carried out and 1 kg uranium as yellow cake was recovered. This experiment suggested that hydrophilic monomer and trunk polymer should be improved to realized the higher activity for uranium recovery from seawater.
; Katakai, Akio; ;
Sep.Sci.Technol., 21(3), p.299 - 313, 1986/00
Times Cited Count：72 Percentile：95.24(Chemistry, Multidisciplinary)no abstracts in English
; Katakai, Akio; ;
Sep.Sci.Technol., 21(6-7), p.563 - 574, 1986/00
Times Cited Count：73 Percentile：95.37(Chemistry, Multidisciplinary)no abstracts in English
; ; Katakai, Akio;
J.Appl.Polym.Sci., 30, p.2967 - 2977, 1985/00
Times Cited Count：104 Percentile：96.81(Polymer Science)no abstracts in English
; Katakai, Akio; ;
Sep.Sci.Technol., 20(2-3), p.163 - 178, 1985/00
Times Cited Count：80 Percentile：96.1(Chemistry, Multidisciplinary)no abstracts in English
