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Journal Articles

Chromium(VI) adsorption-reduction using a fibrous amidoxime-grafted adsorbent

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:5 Percentile:59.1(Engineering, Chemical)

Journal Articles

Non-invasive imaging of radiocesium dynamics in a living animal using a positron-emitting $$^{127}$$Cs tracer

Suzui, 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:0 Percentile:0.01(Multidisciplinary Sciences)

Journal Articles

Microscopic analyses on Zr adsorbed IDA chelating resin by PIXE and EXAFS

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:1 Percentile:21.02(Instruments & Instrumentation)

Journal Articles

Quantitative analysis of Zr adsorbed on IDA chelating resin using Micro-PIXE

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

Journal Articles

Analysis on adsorbent for spent solvent treatment by micro-PIXE and EXAFS

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(01&02), 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.

Journal Articles

Development of a water purifier for radioactive cesium removal from contaminated natural water by radiation-induced graft polymerization

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:14 Percentile:87.42(Chemistry, Physical)

Journal Articles

Evaluation of a cesium adsorbent grafted with ammonium 12-molybdophosphate

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:10 Percentile:74.67(Chemistry, Physical)

Journal Articles

Development of grafted adsorbents for Cs removal from natural water source

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

Journal Articles

Evaluation of antibacterial effect by using a fibrous grafted material loaded Ag ligand

Shibata, Takuya; Seko, Noriaki; Kasai, Noboru; Hoshina, Hiroyuki; Ueki, Yuji

International Journal of Organic Chemistry, 5(2), p.100 - 107, 2015/06

Journal Articles

Development of an adsorbent for Cs removal synthesized by radiation-induced graft polymerization

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

Journal Articles

The Volume reduction method of radioactively-contaminated plant waste through extraction and removal of radioactive cesium

Saiki, Seiichi; Shibata, Takuya; Hoshina, Hiroyuki; Ueki, Yuji; Kasai, Noboru; Seko, Noriaki

Nihon Ion Kokan Gakkai-Shi, 25(4), p.170 - 175, 2014/11

Journal Articles

Evaluation of the scandium affinity under the iron coexistence using radiation grafted adsorbents

Hayashi, Natsuki*; Hoshina, Hiroyuki; Amada, Haruyo; Yamanobe, Takeshi*; Seko, Noriaki

Nihon Ion Kokan Gakkai-Shi, 25(4), p.105 - 108, 2014/11

Journal Articles

Recovery of scandium from hot spring water with graft adsorbent containing phosphoric groups

Hoshina, Hiroyuki; Kasai, Noboru; Amada, Haruyo; Takahashi, Makikatsu*; Tanaka, Kazuya*; Seko, Noriaki

Nihon Ion Kokan Gakkai-Shi, 25(4), p.248 - 251, 2014/11

Journal Articles

A New eco-friendly synthesis method for arsenic adsorbent

Amada, Haruyo; Takahashi, Makikatsu*; Hoshina, Hiroyuki; Seko, Noriaki

Nihon Ion Kokan Gakkai-Shi, 25(4), p.109 - 113, 2014/11

Journal Articles

Synthesis of highly-selective fibrous adsorbent by introducing 2-ethylhexyl hydrogen-2-ethylhexylphosphonate for scandium adsorption

Hoshina, Hiroyuki; Ueki, Yuji; Saiki, Seiichi; Seko, Noriaki

International Journal of Organic Chemistry, 4(3), p.195 - 200, 2014/09

Journal Articles

Optimization of grafted fibrous polymer as a solid basic catalyst for biodiesel fuel production

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$$^{circ}$$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.

JAEA Reports

Pilot-scale synthesis for radioactive cesium adsorbents by radiation graft polymerization and their field tests

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.

Journal Articles

A Novel avenue to gold nanostructured microtubes using functionalized fiber as the ligand, the reductant, and the template

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:46.15(Nanoscience & Nanotechnology)

Journal Articles

Adsorbent for arsenic(V) removal synthesized by radiation-induced graft polymerization onto nonwoven cotton fabric

Hoshina, Hiroyuki; Takahashi, Makikatsu*; Kasai, Noboru; Seko, Noriaki

International Journal of Organic Chemistry, 2(3), p.173 - 177, 2012/09

Journal Articles

Hybrid grafted ion exchanger for decontamination of radioactive cesium in Fukushima Prefecture and other contaminated areas

Iwanade, Akio; Kasai, Noboru; Hoshina, Hiroyuki; Ueki, Yuji; Saiki, Seiichi; Seko, Noriaki

Journal of Radioanalytical and Nuclear Chemistry, 293(2), p.703 - 709, 2012/08

 Times Cited Count:30 Percentile:91.53(Chemistry, Analytical)

We have developed a material that can be used to remove cesium (Cs) in Fukushima Prefecture and other contaminated areas. The developed material was prepared by radiation-induced graft polymerization of ammonium 12-molybdophosphate (AMP) and acrylonitrile (AN) onto nonwoven polyethylene fabric. In the batch study, the adsorbent was able to remove 90%, 87% and 64% of Cs from pure water, acidic water and seawater, respectively. In the column study, adsorbent packed in a column with a diameter of 7 mm and a height of 5 cm was able to remove nearly the entire amount of dissolved Cs. The solution (1 ppm Cs at pH 7) was pumped into the column at a space velocity of 300 h$$^{-1}$$, in which the Cs adsorption capacity at the breakthrough point reached 54 g-Cs/kg-adsorbent. Adsorbent packed into a cartridge with a diameter of 4 cm and a height of 3.8 cm was used in a field test on removing dissolved radioactive Cs in Iitate-mura, and this test was conducted successfully.

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