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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：71.76(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：8 Percentile：53.38(Engineering, Chemical)
Cs tracerSuzui, Nobuo*; Shibata, Takuya; Yin, Y.-G.*; Funaki, Yoshihito*; Kurita, Keisuke; Hoshina, Hiroyuki*; Yamaguchi, Mitsutaka*; Fujimaki, Shu*; Seko, Noriaki*; Watabe, Hiroshi*; et al.
Scientific Reports (Internet), 10, p.16155_1 - 16155_9, 2020/10
Times Cited Count：2 Percentile：27.76(Multidisciplinary Sciences)Arai, Yoichi; Watanabe, So; Ono, Shimpei; Nomura, Kazunori; Nakamura, Fumiya*; Arai, Tsuyoshi*; Seko, Noriaki*; Hoshina, Hiroyuki*; Hagura, Naoto*; Kubota, Toshio*
Nuclear Instruments and Methods in Physics Research B, 477, p.54 - 59, 2020/08
Times Cited Count：2 Percentile：29.04(Instruments & Instrumentation)Arai, Yoichi; Watanabe, So; Ono, Shimpei; Nomura, Kazunori; Nakamura, Fumiya*; Arai, Tsuyoshi*; Seko, Noriaki*; Hoshina, Hiroyuki*; Kubota, Toshio*
QST-M-23; QST Takasaki Annual Report 2018, P. 59, 2020/03
Arai, Yoichi; Watanabe, So; Ono, Shimpei; Nakamura, Masahiro; Shibata, Atsuhiro; Nakamura, Fumiya*; Arai, Tsuyoshi*; Seko, Noriaki*; Hoshina, Hiroyuki*; Hagura, Naoto*; et al.
International Journal of PIXE, 29(1&2), p.17 - 31, 2019/00
The spent PUREX solvent containing U and Pu is generated from the reprocessing process of spent nuclear fuel. The nuclear material removal is important for the safe storage or disposal of the spent solvent. Our previous study revealed that the adsorbent with the iminodiacetic acid (IDA) functional group is one of the most promising materials for designing the nuclear material recovery process. Accordingly, an IDA-type adsorbent was synthesized by using graft polymerization technology or a chemical reaction to improve the adsorption rate and capacity. The synthesized IDA-type adsorbent was characterized by micro particle-induced X-ray emission (PIXE) and extended X-ray absorption fine structure (EXAFS) analyses. The micro-PIXE analysis revealed that Zr was adsorbed on the whole synthesized adsorbents and quantified the microamount of adsorbed Zr. Moreover, EXAFS suggested that Zr in the aqueous solution and solvent can be trapped by the IDA group with different mechanisms.
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：15 Percentile：85.6(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：11 Percentile：73.32(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
Hayashi, Natsuki*; Hoshina, Hiroyuki; Amada, Haruyo; Yamanobe, Takeshi*; Seko, Noriaki
Nihon Ion Kokan Gakkai-Shi, 25(4), p.105 - 108, 2014/11
Hoshina, Hiroyuki; Kasai, Noboru; Amada, Haruyo; Takahashi, Makikatsu*; Tanaka, Kazuya*; Seko, Noriaki
Nihon Ion Kokan Gakkai-Shi, 25(4), p.248 - 251, 2014/11
Amada, Haruyo; Takahashi, Makikatsu*; Hoshina, Hiroyuki; Seko, Noriaki
Nihon Ion Kokan Gakkai-Shi, 25(4), p.109 - 113, 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.
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.
Ma, H.*; Chi, H.*; Wu, J.*; Wang, M.*; Li, J.*; Hoshina, Hiroyuki; Saiki, Seiichi; Seko, Noriaki
ACS Applied Materials & Interfaces, 5(17), p.8761 - 8765, 2013/09
Times Cited Count：14 Percentile：43.96(Nanoscience & Nanotechnology)Hoshina, Hiroyuki; Takahashi, Makikatsu*; Kasai, Noboru; Seko, Noriaki
International Journal of Organic Chemistry, 2(3), p.173 - 177, 2012/09
