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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:1 Percentile:38.14(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:5 Percentile:23.48(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

Nippon 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

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

Journal Articles

Adsorption properties of styrenesulfonate-grafted fibrous metal adsorbent

Ueki, Yuji; Saiki, Seiichi; Seko, Noriaki

Nippon Ion Kokan Gakkai-Shi, 25(4), p.99 - 104, 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.

Journal Articles

Homogeneous transesterification kinetics of triglyceride to biodiesel using grafted fibrous catalyst

Ueki, Yuji; Seko, Noriaki

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 53, 2014/03

no abstracts in English

Journal Articles

The Influence on the vulcanized rubber physical properties by radiation grafting

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

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

Development of catalyst for biodiesel fuel production by radiation-grafting

Ueki, Yuji

Hoshasen To Sangyo, (135), p.10 - 14, 2013/12

no abstracts in English

Journal Articles

Abaca/polyester nonwoven fabric functionalization for metal ion adsorbent synthesis via electron beam-induced emulsion grafting

Madrid, J. F.*; Ueki, Yuji; Seko, Noriaki

Radiation Physics and Chemistry, 90, p.104 - 110, 2013/09

 Times Cited Count:10 Percentile:22.62(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 $$^{circ}$$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 $$^{circ}$$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$$^{2+}$$ and Ni$$^{2+}$$ ions in aqueous solutions with initial pH of 5 at 30 $$^{circ}$$C. Results show that the adsorption capacity of the grafted adsorbent for Cu$$^{2+}$$ is four times higher than Ni$$^{2+}$$ ions.

Journal Articles

Effect of partial delignification of kenaf bast fibers for radiation graft copolymerization

Mohamed, N. H.*; Tamada, Masao; Ueki, Yuji; Seko, Noriaki

Journal of Applied Polymer Science, 127(4), p.2891 - 2895, 2013/02

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 80$$^{circ}$$C 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.

Journal Articles

Pb(II) adsorption performance of fibrous graft adsorbent having phosphate groups

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

Journal Articles

Surface modification of vulcanized rubber by radiation grafting

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

Journal Articles

Boron removal and recovery using adsorbent prepared by radiation grafting

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

Journal Articles

Emulsion graft polymerization of 4-chloromethylstyrene on kenaf fiber by pre-irradiation method

Mohamed, N. H.*; Tamada, Masao; Ueki, Yuji; Seko, Noriaki

Radiation Physics and Chemistry, 82, p.63 - 68, 2013/01

 Times Cited Count:6 Percentile:46.51(Chemistry, Physical)

no abstracts in English

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:21 Percentile:8.06(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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