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Saito, Kyoichi*; Asai, Shiho
Bunseki Kagaku, 66(11), p.771 - 782, 2017/11
Times Cited Count：1 Percentile：3.41(Chemistry, Analytical)Recovery and purification of rare metals, which are essential ingredients for highly functional materials, generally comes with operational difficulty. In this study, we have developed polymer adsorbents specially designed for highly-efficient adsorption of rare metal ions and exhibited their practical adsorption performances. Radiation-induced graft polymerization, one of the effective modification techniques for polymers, was employed for preparing the proposed adsorbents. Among such adsorbents, a 6-nylon fiber with nucleic-acid base, adenine, on the surface of the fiber demonstrated specific adsorption of ruthenium and palladium ions. In addition, a 6-nylon fiber with an extractant HDEHP (bis (2-ethylhexyl) phophoric acid) that has high affinity for lanthanides, achieved higher separation speed than a commercially available HDEHP-impregnated resin.
Seko, Noriaki
Denki Hyoron, 100(12), p.47 - 51, 2015/12
no abstracts in English
Seko, Noriaki; Shibata, Takuya; Kasai, Noboru; Ueki, Yuji; Saiki, Seiichi; Hoshina, Hiroyuki
Hoshasen To Sangyo, (138), p.9 - 12, 2015/06
no abstracts in English
Saiki, Seiichi; Shibata, Takuya; Hoshina, Hiroyuki; Ueki, Yuji; Kasai, Noboru; Seko, Noriaki
Nihon Ion Kokan Gakkai-Shi, 25(4), p.170 - 175, 2014/11
Hayashi, Natsuki*; Hoshina, Hiroyuki; Amada, Haruyo; Yamanobe, Takeshi*; Seko, Noriaki
Nihon Ion Kokan Gakkai-Shi, 25(4), p.105 - 108, 2014/11
Seko, Noriaki; Tamada, Masao; Yoshii, Fumio
Nuclear Instruments and Methods in Physics Research B, 236(1-4), p.21 - 29, 2005/07
Times Cited Count：104 Percentile：98.76(Instruments & Instrumentation)Removal of toxic metals from streaming water and ground water is important task to preserve environment. Radiation processings of grafting and crosslinking can synthesis adsorbent having high performances. Graft adsorbent can be synthesized by using the conventional polymer like polyethylene having variety shapes such as membrane, cloth, and fiber. Especially, the obtained fibrous adsorbent has 100 times higher rate of adsorption than that of commercialized resin. Novel fibrous adsorption for arsenic was synthesized by direct grafting of phosphoric monomer and following zirconium-loading. Fibrous adsorbents of amidoxime and iminodiacetate were applied to the removal of cadmium from the scallop waste. Furthermore, the amidoxime adsorbent is useful to recover rare metal such as uranium and vanadium in seawater. Crosslinked natural polymers like chitin-chitosan in the paste-like state are applicable for the metal adsorbent. This adsorbent can be biodegraded after usage.
Yamaki, Tetsuya; Asano, Masaharu; Yoshida, Masaru
Gekkan Eko Indasutori, 10(6), p.5 - 11, 2005/06
no abstracts in English
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.
Seko, Noriaki; Kasai, Noboru; Tamada, Masao; Hasegawa, Shin; Katakai, Akio; Sugo, Takanobu*
JAERI-Tech 2004-076, 78 Pages, 2005/01
JAERI-Tech-2004-076.pdf:17.11MB
In September 1999, we have soaked 200 kg of fibrous amidoxime adsorbents, synthesized by radiation-induced graft polymerization, into seawater to evaluate their performance. Fractional elution facility was set effectively to elute the rare metals on adsorbents in Mutsu-Establishment. This facility consists of two parts of pre-washing and elution. The present report dealt with planning, manufacture and setting of fractional facility. Marine organism and slime on adsorbent cassette (290
290160 mm) were washed out and every 72 cassettes were set in elution unit (12101210H1460 mm) with nonwoven materials as a packing to avoid elution loss. In the elution process alkaline and alkaline earth metals were eluted with low concentration hydrochloric acid (0.01M) and rare metals were eluted with high concentration (0.5M) after the packing of elution unit into fractional elution facility.
Seko, Noriaki; Takeda, Hayato*; Kasai, Noboru; Tamada, Masao; Hasegawa, Shin; Katakai, Akio; Sugo, Takanobu*
JAERI-Tech 2004-075, 51 Pages, 2005/01
Fibrous adsorbent which is synthesized by radiation induced graft polymerization on the trunk polymers such as polymer nonwoven fabrics and woven cloths exhibits an excellent selective adsorption against heavy metal ions and toxic gases at extremely low concentrations. Two equipments were installed to synthesize the metal-ion and gas adsorbents by means of the radiation-induced graft polymerization in the liquid phase and the dipping, respectively. In the reaction chamber of the liquid phase reactor, the oxygen decreased to 100ppm. The inside temperature raised to 80
C. These characteristics satisfied the specification. The fabric transport can regulate the rate in the range from 1 to 10m/min. The reactor for the dip grafting could reduce the inside oxygen to 100ppm and inside temperature could reach to 80 C. The grafting of GMA was carried out as a characteristic test. The degree of grafting was controlled in the range from 40 to 70%.
Yamaki, Tetsuya; Asano, Masaharu; Yoshida, Masaru
Kogyo Zairyo, 53(1), p.63 - 67, 2005/01
no abstracts in English
Yamaki, Tetsuya; Yoshida, Masaru
Nenryo Denchi, 4(3), p.73 - 78, 2005/01
no abstracts in English
Jo, Akinori*; Okada, Kenji*; Tamada, Masao; Kume, Tamikazu; Sugo, Takanobu; Tazaki, Masato*
Chemistry for the Protection of the Environment 4; Environmental Science Research, Vol. 59, p.49 - 62, 2005/00
Bifunctional cation exchange fibers were synthesized by co-grafting of chloromethylstylene and styrene. on polyethylene-coated polypropylene fibers. The grafted fibers were fictionalized by Arbuzov reaction, suffonation, and acid hydrolysis. Batchwise evaluation of metal ion selectivity clarified that the bifunctional fiber exhibited cooperative recognition of metal ions by both functional groups. The bifunctional fiber took up Pb(II) more rapidly than the monofunctional phosphoric acid fiber and commercial resin adsorbent. Column-mode experiment revealed that flow rate was independent of break through profiles of Pb(II) up to flow rate of 900 h
in space velocity.
Asano, Masaharu; Yoshida, Masaru
Kogyo Zairyo, 52(12), p.65 - 69, 2004/12
no abstracts in English
Seko, Noriaki; Tamada, Masao; Kasai, Noboru; Yoshii, Fumio; Shimizu, Takao*
Kaiyo Kaihatsu Rombunshu, 20, p.611 - 616, 2004/06
Development of the recovery technology of uranium of storing all over seawater can stable supply of mineral resources over the future. The amidoxime adsorbents used by nonwoven fiber of the shape of cloth produced by the radiation graft polymerization technique. It became clear that their adsorbents of the high form of contact efficiency with seawater are important. Therefore, the braid adsorbents by which contact efficiency with seawater is improved were devised. Moreover, by the mooring system using braid adsorbents, since it counted upon lightweight-ization, i.e., rationalization of the marine structure which occupies the great portion of total cost, in this research, while developing the producing method, performance evaluation was performed, and the production method and the applicability of a recovery system were examined.
Tamada, Masao
Genshiryoku Hyakka Jiten ATOMICA (Internet), 15 Pages, 2004/04
no abstracts in English
Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Morita, Yosuke; Suwa, Takeshi; Chen, J.*; Tsubokawa, Norio*; Kobayashi, Kazuhiro*; Kubota, Hitoshi*; Yoshida, Masaru
Radiation Physics and Chemistry, 67(3-4), p.403 - 407, 2003/08
Times Cited Count：76 Percentile：97.02(Chemistry, Physical)no abstracts in English
Seko, Noriaki; Tamada, Masao; Sugo, Takanobu
Kaiyo Kaihatsu Nyusu, 31(1), p.8 - 11, 2003/04
no abstracts in English
Yamaki, Tetsuya; Asano, Masaharu; Yoshida, Masaru
Kogyo Zairyo, 51(4), p.39 - 42, 2003/04
no abstracts in English
Shiraishi, Tomoyuki*; Tamada, Masao; Saito, Kyoichi*; Sugo, Takanobu
Radiation Physics and Chemistry, 66(1), p.43 - 47, 2003/01
Times Cited Count：50 Percentile：93.91(Chemistry, Physical)no abstracts in English
