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Cs in river waterEnomoto, Kazuyuki*; Hoshina, Hiroyuki*; Kasai, Noboru*; Kurita, Keisuke; Ueki, Yuji*; Nagao, Yuto*; Yin, Y.-G.*; Suzui, Nobuo*; Kawachi, Naoki*; Seko, Noriaki*
Chemical Engineering Journal, 460, p.141696_1 - 141696_9, 2023/03
Times Cited Count：1 Percentile：49.6(Engineering, Environmental)This study develops a method that combines a radiation-grafting fibrous Cs-adsorbent filter of ammonium molybdophosphate (AMP) and a Ce:Gd
Al
GaO
scintillator based 
-ray detector for in situ measurements of the activity concentrations of Cs in a continuous water flow.
Hayashi, Natsuki*; Matsumura, Daiju; Hoshina, Hiroyuki*; Ueki, Yuji*; Tsuji, Takuya; Chen, J.*; Seko, Noriaki*
Separation and Purification Technology, 277, p.119536_1 - 119536_8, 2021/12
Times Cited Count：14 Percentile：62.75(Engineering, Chemical)Seko, Noriaki*; Hoshina, Hiroyuki*; Kasai, Noboru*; Shibata, Takuya; Saiki, Seiichi*; Ueki, Yuji*
Radiation Physics and Chemistry, 143, p.33 - 37, 2018/02
Times Cited Count：16 Percentile：85.18(Chemistry, Physical)Shibata, Takuya; Seko, Noriaki; Amada, Haruyo; Kasai, Noboru; Saiki, Seiichi; Hoshina, Hiroyuki; Ueki, Yuji
Radiation Physics and Chemistry, 119, p.247 - 252, 2016/02
Times Cited Count：12 Percentile：74.83(Chemistry, Physical)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
Shibata, Takuya; Seko, Noriaki; Kasai, Noboru; Hoshina, Hiroyuki; Ueki, Yuji
International Journal of Organic Chemistry, 5(2), p.100 - 107, 2015/06
Shibata, Takuya; Seko, Noriaki; Amada, Haruyo; Kasai, Noboru; Saiki, Seiichi; Hoshina, Hiroyuki; Ueki, Yuji
Nihon Ion Kokan Gakkai-Shi, 26(1), p.9 - 14, 2015/01
Saiki, Seiichi; Shibata, Takuya; Hoshina, Hiroyuki; Ueki, Yuji; Kasai, Noboru; Seko, Noriaki
Nihon Ion Kokan Gakkai-Shi, 25(4), p.170 - 175, 2014/11
Ueki, Yuji; Saiki, Seiichi; Seko, Noriaki
Nihon Ion Kokan Gakkai-Shi, 25(4), p.99 - 104, 2014/11
Hoshina, Hiroyuki; Ueki, Yuji; Saiki, Seiichi; Seko, Noriaki
International Journal of Organic Chemistry, 4(3), p.195 - 200, 2014/09
Ueki, Yuji; Saiki, Seiichi; Shibata, Takuya; Hoshina, Hiroyuki; Kasai, Noboru; Seko, Noriaki
International Journal of Organic Chemistry, 4(2), p.91 - 105, 2014/06
Grafted fibrous polymer with quaternary amine groups could function as a highly-efficient catalyst for biodiesel fuel (BDF) production. In this study, the optimization of grafted fibrous polymer (catalyst) and transesterification conditions for the effective BDF production was attempted through a batch-wise transesterification of triglyceride (TG) with ethanol (EtOH) in the presence of a cosolvent. Trimethylamine was the optimal quaternary amine group for the grafted fibrous catalyst. The optimal degree of grafting of the grafted fibrous catalyst was 170%. The optimal transesterification conditions were as follows: The molar quantity of quaternary amine groups, transesterification temperature, molar ratio of TG and EtOH, and primary alkyl alcohol were 0.8 mmol, 80
C, 1:200, and 1-pentanol, respectively. The grafted fibrous catalyst could be applied to BDF production using natural oils. Furthermore, the grafted fibrous catalyst could be used repeatedly after regeneration involving three sequential processes, i.e., organic acid, alkali, and alcohol treatments, without any significant loss of catalytic activity.
Ueki, Yuji; Seko, Noriaki
JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 53, 2014/03
no abstracts in English
Saito, Hiroaki*; Mizote, Norihito*; Ueki, Yuji; Seko, Noriaki
JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 57, 2014/03
no abstracts in English
Kasai, Noboru; Iwanade, Akio; Ueki, Yuji; Saiki, Seiichi; Hoshina, Hiroyuki; Seko, Noriaki
JAEA-Technology 2013-046, 25 Pages, 2014/02
JAEA-Technology-2013-046.pdf:9.63MB
To remove their radioactive species which have long radioactive half-life from the circumstances as rapidly as possible, we developed novel radioactive cesium adsorbents containing ammonium 12-molybdophosphate, which had adsorption selectivity for cesium ion, by radiation grafting method. The bench-scale equipment 150 times as large volume as laboratory scale was established for graft polymerization. The radioactive cesium adsorbents 1,000 times as large as laboratory scale were successfully synthesized with the bench-scale equipment. Moreover, the adsorption performance with radioactive cesium in environmental water was evaluated at field tests in Fukushima Prefecture. As a result, the adsorbents could successfully remove radioactive cesium dissolved in environmental water below the detection limit of radioactivity concentration.
Ueki, Yuji
Hoshasen To Sangyo, (135), p.10 - 14, 2013/12
no abstracts in English
Madrid, J. F.*; Ueki, Yuji; Seko, Noriaki
Radiation Physics and Chemistry, 90, p.104 - 110, 2013/09
Times Cited Count：27 Percentile：89.14(Chemistry, Physical)A metal ion adsorbent was developed from a nonwoven fabric trunk material composed of both natural and synthetic polymers. A pre-irradiation technique was used for emulsion grafting of glycidyl methacrylate (GMA) onto an electron beam irradiated abaca/polyester nonwoven fabric (APNWF). The dependence of degree of grafting (Dg), calculated from the weight of APNWF before and after grafting, on absorbed dose, reaction time and monomer concentration were evaluated. After 50 kGy irradiation with 2 MeV electron beam and subsequent 3 h reaction with an emulsion consisting of 5% GMA and 0.5% polyoxyethylene sorbitan monolaurate (Tween 20) surfactant in deionized water at 40 C, a grafted APNWF with a Dg greater than 150% was obtained. The GMA-grafted APNWF was further modified by reaction with ethylenediamine (EDA) in isopropyl alcohol at 60 C to introduce amine functional groups. After a 3 h reaction with 50% EDA, an amine group density of 2.7 mmole/gram adsorbent was achieved based from elemental analysis. Batch adsorption experiments were performed using Cu
and Ni ions in aqueous solutions with initial pH of 5 at 30 C. Results show that the adsorption capacity of the grafted adsorbent for Cu is four times higher than Ni ions.
Mohamed, N. H.*; Tamada, Masao; Ueki, Yuji; Seko, Noriaki
Journal of Applied Polymer Science, 127(4), p.2891 - 2895, 2013/02
Times Cited Count：13 Percentile：37.82(Polymer Science)Changes in residual lignin of kenaf bast fiber with acidic chlorite using various parameters were conducted to produce partial delignified fiber for radiation graft copolymerization. The effect of delignification temperature, operating time as well as chlorite doses on the residual lignin of the fibers has been reported. Results obtained indicated that the optimal delignification was achieved at 80C for 6h with 0.5% chlorite. The reduction in density, size and tensile strength were attributed to the increase of removal of lignin from the fiber. Radiation induced emulsion graft copolymerization of 4-chloromethyl styrene (CMS) on partial delignified kenaf with residual lignin 
2% resulted in higher degree of grafting of about 143% as compared to the undelignified fiber, which showed the absence of grafting degree.
Ueki, Yuji; Dafader, N. C.*; Seko, Noriaki; Tamada, Masao
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 41, 2013/01
no abstracts in English
Saito, Hiroaki*; Mizote, Norihito*; Ueki, Yuji; Seko, Noriaki
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 45, 2013/01
no abstracts in English
Katakai, Akio*; Yotsumoto, Toshiro*; Takahashi, Akio*; Ueki, Yuji; Seko, Noriaki
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 43, 2013/01
no abstracts in English
