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 d 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 d. 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⁻¹ nitric acid solutions.

中文翻译：

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用于酸性放射性废物中可调离子筛分的氧化石墨烯膜

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表现出优异的分离能力，但由于难以抑制GO纳米片的溶胀效应，因此实现离子-离子分离的报道很少从而精确地将层间距d控制在不同金属离子尺寸之间的特定值。在这里，通过对d的精确双重调整策略实现了从含有多阳离子的酸性放射性废物中选择性分离铀。研究发现，由于质子化效应，GO在强酸性溶液中的溶胀受到很大限制。然后通过增加GO的氧化程度，将层间距进一步精确地减小到铀酰离子的直径以下。^{在pH =3–3 mol L -1}硝酸溶液中成功实现了铀酰离子与其他核素离子的筛分。