Transformation mechanisms between solid material and ion in solutions by radiolysis and sonolysis

固体材料与溶液中离子通过辐射分解和声波分解的转化机制

• 批准号: 18560800
• 负责人: SEKINE Tsutomu
• 金额: $ 2.4万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560800/
• 关键词: radiation; ultrasonics; redox reactions; nanoparticles; technetium; 二酸化テクネチウム; 過テクネチウム酸; ラジカル反応

Radiolytic and sonolytic redox reactions of technetium that was one of long-lived fission products formed in the nuclear materials were investigated. An aqueous solution of pertechnetate (Tc(VII)O_4) that was the most stable chemical species under oxidative conditions was irradiated with bremsstrahlung produced by an electron linear accelerator, and the formation of nanoparticles of technetium(IV) oxide hydrate (Tc(IV)O_2・nH_2O ) was confirmed. This reaction was triggered by a bimolecular reaction of Tc(VII)and hydrated electrons produced by radiolysis of water molecules. The mechanisms of the reducing processes involving disproportionation reactions of Tc(VI) and Tc(V) were clarified.Aqueous pertechnetate (Tc(VII)O_4) solutions and Tc(IV)O_2-nH_2O colloids solutions ([Tc] = 0.1 mM)were sonicated (200 kHz, 200 W) in a glass cell with flat bottom under Ar or He atmosphere at 20℃. No reduction of TcO_4 was observed in this study. However, it was observed that TcO_2・nH_2O colloids dispersed in an aqueous solution were completely dissolved by ultrasonic treatment within 30 min under Ar atmosphere, and TcO_4 was eventually produced. The production of TcO_4 was considerably suppressed in the presence of t-butyl alcohol (an effective scavenger of OH radicals), indicating that Tc(IV) was oxidized by OH radicals (produced by dissociation of water molecules) in hot cavitation bubbles created by ultrasound. The formation rate of TcO_4 under. He atmosphere was slower than that under Ar atmosphere. This can be attributed to a difference of the effective maximum temperature in the collapsing bubbles. Because thermal conductivity of He is much higher than Ar, thermal transport effectively occurs from the bubbles to the surrounding liquid. Thus, temperature of cavitation bubbles filled with He should be lower than those filled with Ar, resulting in the slower OH formation rate.

研究了锝的辐射分解和声解氧化还原反应，锝是核材料中形成的长寿命裂变产物之一。用电子直线加速器产生的轫致辐射照射氧化条件下最稳定的化学物质高锝酸盐（Tc(VII)O_4）的水溶液，确认了氧化锝（IV）水合物（Tc(IV)O_2·nH_2O）纳米颗粒的形成。该反应是由 Tc(VII) 和水分子辐射分解产生的水合电子的双分子反应引发的。阐明了涉及Tc(VI)和Tc(V)歧化反应的还原过程的机理。将高锝酸(Tc(VII)O_4)水溶液和Tc(IV)O_2-nH_2O胶体溶液([Tc] = 0.1 mM)在平底玻璃池中在Ar或He气氛下进行超声处理(200 kHz, 200 W)。 20℃。本研究中未观察到 TcO_4 减少。然而，观察到分散在水溶液中的TcO_2·nH_2O胶体在Ar气氛下通过超声波处理在30分钟内完全溶解，并最终生成TcO_4。在叔丁醇（OH自由基的有效清除剂）存在下，TcO_4的产生被显着抑制，这表明Tc(IV)被超声产生的热空化气泡中的OH自由基（由水分子解离产生）氧化。 TcO_4的生成速率下。 He气氛比Ar气氛下慢。这可以归因于破裂气泡中有效最高温度的差异。由于 He 的热导率远高于 Ar，因此可以有效地从气泡到周围的液体进行热传递。因此，填充 He 的空化泡温度应低于填充 Ar 的空化泡，导致 OH 形成速率较慢。

项目成果

放射線及び超音波によるテクネチウムの酸化還元反応

辐射和超声波发生锝的氧化还原反应

• 发表时间: 2007
• 作者: H.;Furukawa;プラズマ核融合学会;Makoto Otsuki;関根 勉;Tsutomu SEKINE;関根 勉;Tsutomu SEKINE;関根 勉;関根 勉
• 通讯作者: 関根 勉

Oxidative Dissolution of Tc(IV)O_<2-n>H_2O Colloids by Sonolysis

Sonolysis 氧化溶解 Tc(IV)O_<2-n>H_2O 胶体

• 发表时间: 2007
• 作者: H.;Furukawa;プラズマ核融合学会;Makoto Otsuki;関根 勉;Tsutomu SEKINE;関根 勉;Tsutomu SEKINE;関根 勉
• 通讯作者: 関根 勉

Functional interactions between BLM and XRCC3 in the cell.

• DOI: 10.1083/jcb.200702183
• 发表时间: 2007-10-08
• 期刊: The Journal of cell biology
• 作者: Otsuki M;Seki M;Inoue E;Yoshimura A;Kato G;Yamanouchi S;Kawabe Y;Tada S;Shinohara A;Komura J;Ono T;Takeda S;Ishii Y;Enomoto T
• 通讯作者: Enomoto T

Formation and dissolution of T_<c>(IV)O_<2・n>H_<2>O colloids by radiolysis and sonolysis

辐射分解和超声分解T_<c>(IV)O_<2・n>H_<2>O胶体的形成和溶解

• 发表时间: 2007
• 作者: H.;Furukawa;プラズマ核融合学会;Makoto Otsuki;関根 勉;Tsutomu SEKINE
• 通讯作者: Tsutomu SEKINE

放射線及び超音波によるテクネチウムの酸化還元反応-酸化テクネチウム(IV)ナノ粒子の生成と溶解

辐射和超声诱导锝的氧化还原反应 - 氧化锝（IV）纳米颗粒的生成和溶解

• 发表时间: 2007
• 作者: H.;Furukawa;プラズマ核融合学会;Makoto Otsuki;関根 勉
• 通讯作者: 関根 勉