Radiation effect on ionic liquid [Hbet][Tf 2 N] for Nd 2 O 3 separation from simulated spent nuclear fuels
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Radiation effect on ionic liquid [Hbet][Tf2N] for Nd2O3 separation from simulated spent nuclear fuels Fang‑Li Fan1 · De‑Sheng Chen1,2 · Qing‑Gang Huang1 · Jie‑Ru Wang1,2,3 · Cun‑Min Tan1 · Xiao‑Lei Wu1 · Zhi Qin1,2 Received: 5 May 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Radiation-chemical stability of ionic liquid [Hbet][Tf2N] has been investigated under gamma irradiation for Nd2O3 separation from simulated spent nuclear fuels. It was found that Nd2O3 dissolution decreases with increasing absorbed dose of [Hbet] [Tf2N]. However, the dissolution ability of irradiated [Hbet][Tf2N] to Nd2O3 can be regenerated after washing with water. The radiolytic products of [ Hbet][Tf2N] were identified by EMI–MS, and [ Hbet]+ group occurred a little radiolysis during irradiation. The UV–Visible spectra shown an increase in absorption around 275 nm probably due to the radiolysis of [ Hbet] [Tf2N]. FTIR spectra shown little variation around 1730 cm−1 under high radiation dose. Keywords Ionic liquid · Radiation stability · Spent nuclear fuel · Dissolution separation
Introduction Ionic liquids (ILs), which have been widely promoted as “green solvents,” are attracting much attention for applications in the spent nuclear fuel reprocessing due to their unique properties, such as low volatility, flammability, greater radiation stability and wider electrochemical windows and so on [1–7]. Brønsted acidic ionic liquids are emerging as most promising alternatives, as they have useful characteristics of both solid acids and mineral liquid acids [8, 9]. They also can be designed to replace traditional mineral liquid acids such as sulfuric acid and hydrochloric acid in chemical processes. In addition, they are highly tunable, soluble in a wide range of organic solvents, and often reusable. [Hbet][Tf2N] as a common Brønsted acidic ionic liquid has a functionalized carboxylic group in its cationic part, which has the ability to coordinate with metal ions * Fang‑Li Fan [email protected] * Zhi Qin [email protected] 1
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
2
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, China
3
School of Nuclear Science and Technology, Lanzhou University, Lanzhou, China
[10–12]. [Hbet][Tf2N] has been used to dissolve rare-earth oxides from various media [13–16] and separate some metal ions [17–20]. Recently, carboxyl-functionalized ionic liquid [Hbet][Tf2N] was used firstly to separate the neutron poisons, lanthanide oxide as well as some fission products from simulated spent nuclear fuel by the selective dissolution [21]. However, the radiation stabilities of ionic liquids are crucial in evaluating their potential application in the spent nuclear fuel reprocessing [22, 23]. If ionic liquids are to be successful in their application for highly radioactive materials, there will be a requirement for them to be robust high radiation dose. Many works have investigated the radiation stability of diffe
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