Wu Tong, Wang Zhe, Lu Yuexiang, Liu Shuang, Li Hongpeng, Ye Gang, Chen Jing
Institute of Nuclear and New Energy Technology (INET) Collaborative Innovation Center of Advanced Nuclear Energy Technology Tsinghua University Beijing 100084 P. R. China.
The MOE Key Laboratory of Resource and Environmental System Optimization School of Environment and Chemical Engineering North China Electric Power University Beijing 102206 P. R. China.
Adv Sci (Weinh). 2021 Feb 18;8(7):2002717. doi: 10.1002/advs.202002717. eCollection 2021 Apr.
Graphene oxide (GO) membranes with unique nanolayer structure have demonstrated excellent separation capability based on their size-selective effect, but there are few reports on achieving ion-ion separation, because it is difficult to inhibit the swelling effect of GO nano sheets as well as to precisely control the interlayer spacing to a specific value between the sizes of different metal ions. Here, selective separation of uranium from acidic radioactive waste containing multication is achieved through a precise dual-adjustment strategy on . It is found that GO swelling is greatly restricted in highly acidic solution due to protonation effect. Then the interlayer spacing is further precisely reduced to below the diameter of uranyl ion by increasing the oxidation degree of GO. Sieving uranyl ions from other nuclide ions is successfully realized in pH =3-3 mol L nitric acid solutions.
具有独特纳米层结构的氧化石墨烯（GO）膜基于其尺寸选择效应展现出了优异的分离能力，但关于实现离子-离子分离的报道却很少，因为抑制氧化石墨烯纳米片的溶胀效应以及将层间距精确控制在不同金属离子尺寸之间的特定值很困难。在此，通过对……的精确双重调节策略实现了从含多种阳离子的酸性放射性废料中选择性分离铀。研究发现，由于质子化效应，氧化石墨烯在高酸性溶液中的溶胀受到极大限制。然后，通过提高氧化石墨烯的氧化程度，将层间距进一步精确减小至低于铀酰离子的直径。在pH = 3 - 3 mol/L硝酸溶液中成功实现了从其他核素离子中筛分铀酰离子。
