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Search Results: Records 1-20 displayed on this page of 155

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Journal Articles

Sorption mechanism of europium(III) onto metakaolin-based geopolymers

Yildirim, A. C.*; Mei, H.*; Toda, Kanako*; Aoyagi, Noboru; Saito, Takumi*

Applied Clay Science, 274, p.107853_1 - 107853_9, 2025/09

https://doi.org/10.1016/j.clay.2025.107853
 Times Cited Count：0 Percentile：0.00(Chemistry, Physical)

Journal Articles

Bimodal pore size evolution of metakaolin-based geopolymers at the initial stage of curing; A Small-angle neutron scattering study

Toda, Kanako*; Motokawa, Ryuhei; Saito, Takumi*

Journal of Physical Chemistry C, 11 Pages, 2025/08

https://doi.org/10.1021/acs.jpcc.5c02876
 Times Cited Count：0 Percentile：0.00

Journal Articles

U(VI) adsorption on mudstone in the presence of carbonate; Batch experiments, modeling, cryo-TRLFS and PARAFAC analysis

Mei, H.; Aoyagi, Noboru; Saito, Takumi*; Tanaka, Kazuya; Sugiura, Yuki; Tachi, Yukio

Applied Clay Science, 276, p.107944_1 - 107944_8, 2025/07

https://doi.org/10.1016/j.clay.2025.107944
 Times Cited Count：0 Percentile：0.00

Journal Articles

Diffusion of Cs$$^{+}$$, I$$^{-}$$ and HDO onto pre-Neogene sedimentary rocks

Hou, L.*; Fukatsu, Yuta; Okamoto, Shunichi*; Toda, Kanako*; Nakata, Kotaro*; Nohara, Shintaro*; Ishidera, Takamitsu; Saito, Takumi*

Journal of Nuclear Science and Technology, 14 Pages, 2025/00

https://doi.org/10.1080/00223131.2025.2528482
 Times Cited Count：1 Percentile：81.49(Nuclear Science & Technology)

Journal Articles

Sorption of Cs$$^{+}$$ and Eu$$^{3+}$$ onto coherent and melange-type pre-neogene sedimentary rocks

Hou, L.*; Toda, Kanako*; Mei, H.; Aoyagi, Noboru; Saito, Takumi*

Journal of Nuclear Science and Technology, 61(11), p.1488 - 1498, 2024/11

https://doi.org/10.1080/00223131.2024.2356767
 Times Cited Count：4 Percentile：84.44(Nuclear Science & Technology)

Journal Articles

Trivalent lanthanide sorption onto illite in the presence of carbonate; A Study combining thermodynamic sorption modeling, time-resolved laser fluorescence spectroscopy, and parallel factor analysis

Sugiura, Yuki; Ishidera, Takamitsu; Aoyagi, Noboru; Mei, H.; Saito, Takumi*; Tachi, Yukio

Applied Clay Science, 258, p.107476_1 - 107476_10, 2024/09

https://doi.org/10.1016/j.clay.2024.107476
 Times Cited Count：2 Percentile：53.07(Chemistry, Physical)

Journal Articles

Application of diffusive gradients in thin films (DGT) for the dynamic speciation of radioactive cesium in Fukushima Prefecture, Japan

Tanaka, Takuro*; Fukuoka, Masafumi*; Toda, Kanako*; Nakanishi, Takahiro; Terashima, Motoki; Fujiwara, Kenso; Niwano, Yuma*; Kato, Hiroaki*; Kobayashi, Natsuko*; Tanoi, Keitaro*; et al.

ACS ES&T Water (Internet), 4(8), p.3579 - 3586, 2024/08

https://doi.org/10.1021/acsestwater.4c00453

Journal Articles

Comprehensive extraction study using $$N,N$$-dioctylthiodiglycolamic acid; Effect of S donor on metal extraction

Shimojo, Kojiro; Fujiwara, Iori*; Saito, Takumi*; Oshima, Tatsuya*

Analytical Sciences, 40(8), p.1429 - 1436, 2024/08

https://doi.org/10.1007/s44211-024-00577-9
 Times Cited Count：0 Percentile：0.00(Chemistry, Analytical)

Extraction ability of $$N,N$$-dioctylthiodiglycolamic acid (T-DODGAA), a soft-base sulfur donor ligand with an amide group and a carboxylic acid connected by a thioether chain, for 56 metal ions have been comprehensively investigated and compared with that of N,N-dioctyldiglycolamic acid (DODGAA) with an etheric oxygen atom, a hard-base donor. The p$$K_{a}$$ of the thiodiglycolamic acid framework was determined to be 3.71 $$pm$$ 0.06 in water (0.1 M LiCl, 25$$^{circ}$$C ) by potentiometric titration, indicating that T-DODGAA is a slightly weaker acid than DODGAA (p$$K_{a}$$ = 3.54 $$pm$$ 0.03). T-DODGAA can quantitatively extract various metal ions from the 56 metal ions through a proton-exchange reaction. T-DODGAA provided higher extraction performance than DODGAA for Hf(IV), Cr(III), Fe(III), Ni(II), Cu(II), Pd(II), Ag(I), Au(III), Hg(II), Al(III), and Ga(III), especially for soft metal ions. Furthermore, to demonstrate the practical feasibility of T-DODGAA for hydrometallurgy and metal recycling, we performed selective separation tests of rare metal ions such as Sc(III), Ni(II), Co(II), Pd(II), Au(III), In(III), and Ga(II) in metal-mixed extraction systems.

Journal Articles

Globular pattern formation of hierarchical ceria nanoarchitectures

Aoyagi, Noboru; Motokawa, Ryuhei; Okumura, Masahiko; Ueda, Yuki; Saito, Takumi*; Nishitsuji, Shotaro*; Taguchi, Tomitsugu*; Yomogida, Takumi; Sazaki, Gen*; Ikeda, Atsushi

Communications Chemistry (Internet), 7, p.128_1 - 128_13, 2024/06

https://doi.org/10.1038/s42004-024-01199-y
 Times Cited Count：1 Percentile：19.01(Chemistry, Multidisciplinary)

Journal Articles

"Invisible" radioactive cesium atoms revealed; Pollucite inclusion in cesium-rich microparticles (CsMPs) from the Fukushima Daiichi Nuclear Power Plant

Miyazaki, Kanako*; Takehara, Masato*; Minomo, Kenta*; Horie, Kenji*; Takehara, Mami*; Yamasaki, Shinya*; Saito, Takumi*; Onuki, Toshihiko*; Takano, Masahide; Shiotsu, Hiroyuki; et al.

Journal of Hazardous Materials, 470(15), p.134104_1 - 134104_11, 2024/05

https://doi.org/10.1016/j.jhazmat.2024.134104
 Times Cited Count：2 Percentile：36.23(Engineering, Environmental)

Journal Articles

U(VI) sorption on illite in the presence of carbonate studied by cryogenic time-resolved laser fluorescence spectroscopy and parallel factor analysis

Mei, H.; Aoyagi, Noboru; Saito, Takumi*; Tanaka, Kazuya; Sugiura, Yuki; Tachi, Yukio

Applied Geochemistry, 162, p.105926_1 - 105926_8, 2024/02

https://doi.org/10.1016/j.apgeochem.2024.105926
 Times Cited Count：3 Percentile：63.59(Geochemistry & Geophysics)

Journal Articles

Origin of dissolved organic matter in deep groundwater of marine deposits and its implication for metal binding

Saito, Takumi*; Nishi, Shusaku*; Amano, Yuki; Beppu, Hikari*; Miyakawa, Kazuya

ACS ES&T Water (Internet), 3(12), p.4103 - 4112, 2023/12

https://doi.org/10.1021/acsestwater.3c00505

Journal Articles

Heterogeneous aggregation of humic acids studied by small-angle neutron and X-ray scattering

Saito, Takumi*; Motokawa, Ryuhei; Okubo, Takahiro*; Miura, Daisuke*; Kumada, Takayuki

Environmental Science & Technology, 57(26), p.9802 - 9810, 2023/07

https://doi.org/10.1021/acs.est.3c02028
 Times Cited Count：2 Percentile：15.33(Engineering, Environmental)

Journal Articles

Hydration states of europium(III) adsorbed on silicas with nano-sized pores

Murota, Kento*; Aoyagi, Noboru; Mei, H.; Saito, Takumi*

Applied Geochemistry, 152, p.105620_1 - 105620_11, 2023/05

https://doi.org/10.1016/j.apgeochem.2023.105620
 Times Cited Count：5 Percentile：55.22(Geochemistry & Geophysics)

Journal Articles

Lanthanide and actinide ion complexes containing organic ligands investigated by surface-enhanced infrared absorption spectroscopy

Hirata, Sakiko*; Kusaka, Ryoji; Meiji, Shogo*; Tamekuni, Seita*; Okudera, Kosuke*; Hamada, Shoken*; Sakamoto, Chihiro*; Honda, Takumi*; Matsushita, Kosuke*; Muramatsu, Satoru*; et al.

Inorganic Chemistry, 62(1), p.474 - 486, 2023/01

https://doi.org/10.1021/acs.inorgchem.2c03618
 Times Cited Count：3 Percentile：24.84(Chemistry, Inorganic & Nuclear)

Journal Articles

High-temperature gaseous reaction of cesium with siliceous thermal insulation; The Potential implication to the provenance of enigmatic Fukushima cesium-bearing material

Rizaal, M.; Nakajima, Kunihisa; Saito, Takumi*; Osaka, Masahiko; Okamoto, Koji*

ACS Omega (Internet), 7(33), p.29326 - 29336, 2022/08

https://doi.org/10.1021/acsomega.2c03525
 Times Cited Count：5 Percentile：31.20(Chemistry, Multidisciplinary)

Journal Articles

Current status of Geological disposal by "all-Japan" activities, 6; Post-closure safety assessment (2)

Tachi, Yukio; Saito, Takumi*; Kirishima, Akira*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 64(5), p.290 - 295, 2022/05

https://doi.org/10.3327/jaesjb.64.5_290

no abstracts in English

Journal Articles

Volatilization of B$$_{4}$$C control rods in Fukushima Daiichi nuclear reactors during meltdown; B-Li isotopic signatures in cesium-rich microparticles

Fueda, Kazuki*; Takami, Ryu*; Minomo, Kenta*; Morooka, Kazuya*; Horie, Kenji*; Takehara, Mami*; Yamasaki, Shinya*; Saito, Takumi*; Shiotsu, Hiroyuki; Onuki, Toshihiko*; et al.

Journal of Hazardous Materials, 428, p.128214_1 - 128214_10, 2022/04

https://doi.org/10.1016/j.jhazmat.2022.128214
 Times Cited Count：13 Percentile：64.68(Engineering, Environmental)

Journal Articles

Dispersive XAFS Study on the Laser-Induced Reduction of a Rh$$^{3+}$$ ion complex; Presence of a Rh$$^{+}$$ Intermediate in Direct Photoreduction

Saeki, Morihisa*; Matsumura, Daiju; Nakanishi, Ryuzo*; Yomogida, Takumi; Tsuji, Takuya; Saito, Hiroyuki*; Oba, Hironori*

Journal of Physical Chemistry C, 126(12), p.5607 - 5616, 2022/03

https://doi.org/10.1021/acs.jpcc.1c10160
 Times Cited Count：2 Percentile：10.67(Chemistry, Physical)

The reaction mechanism of the direct photoreduction of a Rh$$^{3+}$$ ion complex to a Rh$$^{0}$$ species induced by pulsed ultraviolet laser irradiation was studied using dispersive X-ray absorption fine structure (DXAFS) spectroscopy. The time-resolved X-ray absorption near edge structure (XANES) showed the absence of isosbestic points and suggested that more than two Rh$$^{n+}$$ species contribute toward the direct photoreduction of Rh$$^{3+}$$. Analysis of the time-resolved XANES data by singular value deposition showed that the direct photoreduction involves three Rh$$^{n+}$$ species. Multivariate curve resolution by alternating least-squares analysis (MCR-ALS) of the time-resolved XANES data gave pure spectra and concentration profiles of the three Rh$$^{n+}$$ species. The Rh$$^{n+}$$ species were assigned to Rh$$^{3+}$$, Rh$$^{+}$$, and Rh$$^{0}$$ species based on the features of the pure XANES spectra. The concentration profiles suggested that the direct photoreduction proceeds in the order of Rh$$^{3+}$$ $$rightarrow$$ Rh$$^{+}$$ $$rightarrow$$ Rh$$^{0}$$. A reaction mechanism, which was proposed involving photoreductions of Rh$$^{3+}$$ and Rh$$^{+}$$, photoinduced autocatalytic reductions of Rh$$^{3+}$$ and Rh$$^{+}$$, and photooxidation of Rh$$^{+}$$, well reproduced the concentration profiles of three Rh$$^{n+}$$ species.

Journal Articles

Uranium (VI) sorption on illite under varying carbonate concentrations; Batch experiments, modeling, and cryogenic time-resolved laser fluorescence spectroscopy study

Mei, H.; Aoyagi, Noboru; Saito, Takumi*; Kozai, Naofumi; Sugiura, Yuki; Tachi, Yukio

Applied Geochemistry, 136, p.105178_1 - 105178_8, 2022/01

https://doi.org/10.1016/j.apgeochem.2021.105178
 Times Cited Count：22 Percentile：88.95(Geochemistry & Geophysics)

155 (Records 1-20 displayed on this page)