Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
小川 晃弘*; 勝木 健太*; 新井 剛*; 宮崎 康典; 渡部 創; 佐野 雄一; 竹内 正行
Journal of Nuclear Science and Technology, 63(9), p.1015 - 1022, 2026/09
被引用回数：1 パーセンタイル：84.64(Nuclear Science & Technology)本研究は、高レベル放射性廃液(HLLW)からマイナーアクチノイド(MA(III))を分離する抽出クロマトグラフィーで発生する廃棄物量を低減するため、使用済吸着材の再利用性を評価した。再生方法として、(i)有機溶媒による抽出剤の脱離および(ii)吸着担体への再含浸を検討した。その候補溶媒にn-ドデカンと1-オクタノールをそれぞれ用いた。抽出剤の脱離性能や再含浸後の吸着・溶離性能の評価に加え、脱離後の回収溶液を真空蒸留に供し、抽出剤と溶媒の分離回収を試みた。その結果、溶媒処理によって吸着材から抽出剤を除去できること、ならびに再含浸によって吸着材の吸着および溶離性能が回復することを確認した。さらに、n-ドデカンを用いた場合、脱離後の回収溶液から溶媒と抽出剤を効率的に分離できることを明らかにした。
荒井 陽一; 後藤 泰裕; 渡部 創; 吾郷 友宏*; 新井 剛*; 勝木 健太*; 福元 博基*; 保科 宏行*; 瀬古 典明*
Progress in Nuclear Science and Technology (Internet), 8, p.329 - 332, 2025/09
Radioactive liquid waste containing nuclear fuel materials and chemical reagents is stored in nuclear facilities. To eliminate the radioactivity of the radioactive liquid waste, we developed RFIDA, a new perfluoroalkyl (RF)-based ligand with a basic structure of iminodiacetic acid (IDA). In this study, an adsorption test was conducted by impregnating RFIDA into porous silica with a polymer was conducted to confirm that the synthesized RFIDA adsorbs cations. The results confirmed that RFIDA exhibits the ability to adsorb or elute uranium depending on the nitric acid concentration.
荒井 陽一; 渡部 創; 渡部 雅之; 新井 剛*; 勝木 健太*; 吾郷 友宏*; 藤川 寿治*; 武田 啓佑*; 福元 博基*; 保科 宏行*; et al.
Nuclear Instruments and Methods in Physics Research B, 554, p.165448_1 - 165448_10, 2024/09
被引用回数：0 パーセンタイル：0.00(Instruments & Instrumentation)Radioactive aqueous and organic liquid wastes contaminated by U and radioactive materials have been generated through solvent extraction experiments on nuclear fuel materials. Although incineration and denitrification / conversion processes are promising for treatment of such liquid wastes, installation of large equipment is essential. Treatment of liquid wastes generated from the reprocessing experiments is one of important tasks of Systematic Treatments of RAdioactive liquid wastes for Decommissioning (STRAD) project, and the recovery technologies of nuclear materials from the spent solvent has been developed. However, recovery of trace amounts of nuclear fuel material from aqueous solutions with wide pH range is still a challenging task. In our previous study, the porous silica particles with a high specific surface area bearing the iminodiacetic acid (IDA) functional group were revealed to be applicable to recover cations. Although the IDA group introduced adsorbents showed an excellent adsorption reaction from the aqueous solution, further improvement related to the adsorption amount is indispensable for application to the radioactive liquid treatment. In this study, fluorous ligands with IDA group were newly synthesized, and its complexation behavior with cations was investigated in order to understand the adsorption mechanism.
荒井 陽一; 長谷川 健太; 渡部 創; 渡部 雅之; 箕輪 一希*; 松浦 治明*; 羽倉 尚人*; 勝木 健太*; 新井 剛*; 小西 康裕*
Journal of Radioanalytical and Nuclear Chemistry, 333(7), p.3585 - 3593, 2024/07
被引用回数：1 パーセンタイル：11.16(Chemistry, Analytical)Radioactive aqueous and organic liquid wastes contaminated by U are generated by solvent extraction of nuclear fuel materials in experiments of reprocessing technologies. Although incineration and denitrification/conversion processes are promising for treating such liquid waste, the installation of large equipment is essential. To give appropriate treatment procedures for radioactive liquid waste generated in nuclear facilities, STRAD (Systematic Treatments of RAdioactive liquid wastes for Decommissioning) project was started by Japan Atomic Energy Agency (JAEA) with several organizations. We are focusing on baker's yeasts for their excellent metal ions adsorption characteristics, easy handling and low prices. In order to optimize adsorption performance and operation procedures as the liquid waste treatment technology, adsorption performance of U has to be precisely investigated. In this study, adsorption performance of U and anion from nitric acid solution was investigated by batch-wise adsorption experiments.
勝木 健太*; 石澤 健太*; 新井 剛*; 渡部 創; 佐野 雄一; 竹内 正行
no journal, ,
高レベル放射性廃液からのMA(III)分離回収技術の確立を目指し、TEHDGA含浸吸着材を用いたカラム分離スキームの検討を行った。本研究より、TEHDGA含浸吸着材において、コンディショニング液の硝酸濃度を2.8Mとすることでより効率的な分離スキームを構築できることが示唆された。
市原 大嗣*; 勝木 健太*; 新井 剛*; 渡部 創; 佐野 雄一; 竹内 正行
no journal, ,
抽出クロマトグラフィ法において、MA(III)・Ln(III)共回収工程のMA製品に含まれるMo(VI)及びSb(III)の選択的分離除去技術の確立を指向し、メタスズ酸(H
SnO
)の基礎吸着性能を評価した。本研究の成果よりメタスズ酸は、硝酸濃度0.1MにおいてMo(VI)及びSb(III)の分離が可能であることが示された。
二田 郁子; 勝木 健太; 相田 玲奈; 田中 康介; 古瀬 貴広
no journal, ,
Silicon drift detectors (SDD) are widely used in energy-dispersive X-ray analysis owing to their high resolution and high detection efficiency in detecting low-energy photons. In addition, because the detector is cooled using a Peltier element, it enables a compact device configuration. Utilizing these features, we developed a compact analytical device for electron capture decay radionuclides such as Ca-41 and Mo-93 via their characteristic X-ray emission. The analytical system was first demonstrated with Ca-41 and evaluated its applicability to the analysis of radioactive waste from the Fukushima Daiichi Nuclear Power Station (1FNPS).
