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Journal Articles

Zeolite-assisted radiolysis of aromatic chlorides mitigating influence of coexisting ions in water matrix

Kumagai, Yuta; Kimura, Atsushi*; Taguchi, Mitsumasa*; Watanabe, Masayuki

Radiation Physics and Chemistry, 191, p.109831_1 - 109831_8, 2022/02

https://doi.org/10.1016/j.radphyschem.2021.109831

Times Cited Count：0 Percentile：0.01(Chemistry, Physical)

In this study, we investigated and compared the effects of a high-silica zeolite (HMOR) on the radiation-induced degradation of three aromatic chlorides, 2-chlorophenol (2-ClPh), 2-chloroaniline (2-ClAn), and 2-chlorobenzoic acid (2-ClBA), in order to examine its potential to reduce the influence of ions in water matrix in the irradiation treatment of water-soluble organic compounds. In the presence of ions reactive to radicals, the degradation of 2-ClPh in water was inhibited, but the combined use of HMOR much improved the degradation yield. This improvement was attributed to high performance of HMOR in adsorption of 2-ClPh. Similarly, HMOR was effective for adsorption of 2-ClAn and facilitated the 2-ClAn degradation by irradiation. In contrast, HMOR was poor at adsorption of 2-ClBA and consistently the degradation of 2-ClBA in the water-HMOR mixture was inhibited by the radical scavenger. These results demonstrate that HMOR can mitigate the influence of radical scavengers in water.

Journal Articles

Treatment of pharmaceuticals/antibiotics in wastewater by combination of zeolite adsorbent with ionizing radiation

Taguchi, Mitsumasa*; Kumagai, Yuta; Kimura, Atsushi*

IAEA-TECDOC-1855, p.106 - 116, 2018/00

The technology for the decomposition of trace amounts of halogenated pharmaceuticals/antibiotics was developed in wastewater by use of the combination method of zeolite adsorbent and ionizing radiation. HMOR, a hydrophobic high-silica mordenite-type zeolite, was employed to concentrate 2-chlorophenol (2-ClPh) as a simple model of halogenated pharmaceuticals/antibiotics. HMOR adsorbed above 99% of 2-ClPh from dilute aqueous solutions. The yield of Cl $^{-}$ production in HMOR mixture corresponded to the aqueous solution containing 10 fold higher concentration of dissolved 2-ClPh. Clofibrate and triclosan, one of chlorinated pharmaceuticals/antibiotics, in real wastewater were treated by use of the combination method of HMOR and ionizing radiation. Production yield of Cl $^{-}$ by use of the adsorbent was about twice higher than that in aqueous solution, and HMOR was contributed for effective reduction of chlorinated pharmaceuticals/antibiotics in real wastewater.

Journal Articles

Silver extraction by -tetraoctyl-thiodiglycolamide

Sasaki, Yuji; Suzuki, Tomoya; Morita, Keisuke; Yoshizuka, Kazuharu*

Hydrometallurgy, 159, p.107 - 109, 2016/01

https://doi.org/10.1016/j.hydromet.2015.11.010

Times Cited Count：5 Percentile：27.09(Metallurgy & Metallurgical Engineering)

The novel tridentate extractant including soft donor has developed and examined. The extractant, tetraoctyl-thiodiglycolamide (S-DGA), is analogous structure to tetraoctyl-diglycolamide (TODGA), but with sulfur donor instead of ether oxygen of TODGA. S-DGA has unique property to extract silver from acidic solutions to n-dodecane with relatively high D values. We investigated the extraction behavior of Ag in various acids, HNO $_{3}$ , H $_{2}$ SO $_{4}$ , and HClO $_{4}$ .

Journal Articles

Yields of primary products from chloroethylenes in air under electron beam irradiation

Hakoda, Teruyuki; Hashimoto, Shoji*; Kojima, Takuji

Proceedings of 9th International Conference on Radiation Curing (RadTech Asia '03) (CD-ROM), 4 Pages, 2003/00

no abstracts in English

Journal Articles

Electron-beam decomposition of vaporized VOCs in air

Hirota, Koichi; Hakoda, Teruyuki; Arai, Hidehiko; Hashimoto, Shoji

Radiation Physics and Chemistry, 65(4-5), p.415 - 421, 2002/11

https://doi.org/10.1016/S0969-806X(02)00353-5

Times Cited Count：25 Percentile：81.32(Chemistry, Physical)

no abstracts in English

JAEA Reports

The Sorption database of radionuclides for cementitious materials

Kato, Hiroshige*; Mine, Tatsuya*; Mihara, Morihiro; Oi, Takao; Honda, Akira

JNC TN8400 2001-029, 63 Pages, 2002/01

JNC-TN8400-2001-029.pdf:1.81MB

Cementitious materials will be used for the TRU waste repository as a component of engineered barrier system. The distribution coefficients which represent the retardation of radionuclides migration for the cementitious materials would be one of the important parameter for the safety assessment. The much information of radionuclide sorption onto the cementitious materials has been accumulated through the study in the world. Therefore it is necessary to compile the information and Kd of the radionuclides reported in previous studies. In this report, the Kd of the important radionuclides, such as C, Ni, Se, Sr, Zr, Nb, Mo, Tc, Sn, I, Cs, Sm, Pb, Ra, Ac, Th, Pa, U, Np, Pu, Am, Cm, for the cementitious materials were compiled as the Sorption Database (SDB). For radionuclides to be sensitive to the redox potential, e.g. Se, Tc, Pa, U, Pu and Np, some Kds measured under the controlled atmosphere had been reported, and few Kds measured under the controlled redox potential had been reported. For Se, Mo, Sm, Cm and Ac, the distribution coefficients had not been reported, therefore distribution coefficients of Se and Mo for OPC (Ordinary Portland Cement) pastes were measured by batch sorption experiments and these data were added into the SDB.

JAEA Reports

Recent research activities and future subjects on stable- and radio-isotopes of chlorine in environment

Kushita, Kohei

JAERI-Review 2001-043, 95 Pages, 2001/12

JAERI-Review-2001-043.pdf:4.04MB

no abstracts in English

Journal Articles

Charge-separation process of the C $_{2}$ H $_{4}$ +Cl $_{2}$ reaction in water; Ab initio molecular orbital study using a cluster model

Kurosaki, Yuzuru

Journal of Physical Chemistry A, 105(49), p.11080 - 11087, 2001/12

https://doi.org/10.1021/jp012420w

Times Cited Count：3 Percentile：9.15(Chemistry, Physical)

no abstracts in English

JAEA Reports

Specifications for gas treatment apparatus

Teraoka, Yuden; Yoshigoe, Akitaka

JAERI-Tech 2001-005, 45 Pages, 2001/03

JAERI-Tech-2001-005.pdf:3.39MB

no abstracts in English

Journal Articles

Photochemical reaction intermediates of benzyl chloride in condensed phase

Hiratsuka, Hiroshi*; Okamoto, Takahiro*; Kuroda, Satoshi*; Okutsu, Tetsuo*; Maeoka, Hironori*; Taguchi, Mitsumasa; Yoshinaga, Tetsutaro*

Research on Chemical Intermediates, 27(1-2), p.137 - 153, 2001/02

https://doi.org/10.1163/156856701745032

Times Cited Count：9 Percentile：18.42(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

3-D analysis of tritium and chloride transport in sandy aquifer

Takeda, Seiji; Kimura, Hideo

KURRI-KR-53, p.14 - 17, 2000/09

no abstracts in English

Journal Articles

Ab initio molecular orbital study of the C $_{2}$ H $_{4}$ +Cl $_{2}$ C $_{2}$ H $_{4}$ Cl $_{2}$ reaction

Kurosaki, Yuzuru*

Journal of Molecular Structure; THEOCHEM, 503(3), p.231 - 240, 2000/05

no abstracts in English

Journal Articles

k $_{0}$ standardization approach in neutron-induced prompt -ray analysis at JAERI

Matsue, Hideaki; Yonezawa, Chushiro

Journal of Radioanalytical and Nuclear Chemistry, 245(1), p.189 - 194, 2000/04

https://doi.org/10.1023/A:1006799213794

Times Cited Count：21 Percentile：77.41(Chemistry, Analytical)

no abstracts in English

JAEA Reports

JOYO coolant sodium and cover gas purity control database (MK-II core)

; Nemoto, Masaaki; Saikawa, Takuya*; Sukegawa, Kazuya*

JNC TN9410 2000-008, 66 Pages, 2000/03

JNC-TN9410-2000-008.pdf:1.39MB

The experimental fast reactor "JOYO" served as the MK-II irradiation bed core for testing fuel and material for FBR development for 15 years from 1982 to 1997. During the MK-II operation, impurities concentrations in the sodium and the argon gas were determined by 67 samples of primary sodium, 81 samples of secondary sodium, 75 samples of primary argon gas, 89 samples of secondary argon gas (the overflow tank) and 89 samples of secondary argon gas (the dump tank). The sodium and the argon gas purity control data were accumulated from in thirty-one duty operations, thirteen special test operations and eight annual inspections. These purity control results and related plant data were compiled into database, which were recorded on CD-ROM for user convenience. Purity control data include concentration of oxygen, carbon, hydrogen, nitrogen, chlorine, iron, nickel and chromium in sodium, concentration of oxygen, hydrogen, nitrogen, carbon monoxide, carbon dioxide, methane and helium in argon gas with the reactor condition.

JAEA Reports

Study on migration behavior of radionuclides in engineered clay barrier (II)

*; *; *

JNC TJ8400 2000-018, 79 Pages, 2000/02

JNC-TJ8400-2000-018.pdf:2.09MB

As a basic research for geological disposal of high-level radioactive wastes, diffusion behavior of radionuclides and corrosion behavior of overpack materials in clay buffer materials (bentonite) were studied. In the study on the diffusion behavior of radionuclides, basal spacing and water content were determined for water saturated, compacted Na-montmorillonite that is major clay mineral of bentonite. The apparent diffusion coefficients of Na $^{+}$ , Sr $^{2+}$ , Cs $^{+}$ and Cl $^{-}$ ions and their activation energies were also determined at different dry densities of montmorillonite. For all kinds of ions, the activation energies were found to increase as the dry density increased. These findings suggest that the diffusion mechanism of ions in compacted montmorillonite changed with increasing dry density. As a reasonable explanation for the changes in the activation energy, we proposed a multiprocess diffusion model, in which predominant diffusion process is considered to change from pore water diffusion to interlayer diffusion via surface diffusion when the dry density increases. The Na-montmorillonite is expected to alter by the ion exchange with Ca $^{2+}$ ions, which could be introduced from groundwater and/or cementitious materials in a repository. The apparent diffusion coefficients of Na $^{+}$ and Cs $^{+}$ ions and their activation energies were studied for Na/Ca montmorillonite mixtures in order to know the effect of this kind of alteration on the diffusion behavior of ions. It was found that the alteration of montmorillonite affected diffusion coefficients and the activation energies for both kinds of cations. These effects cannot be explained only by the pore water diffusion. The multiprocess diffusion model proposed in this study is suggested as the most reasonable explanation for the effects. The oxidation behavior of pyrite in bentonite during drying process was studied for understanding corrosion behavior of overpack materials in bentonite. There ...