ABSTRACT When water contacts with porous materials, water and chemical species dissolved in the water transfer into the inside of the porous materials. Here, to study the transfer of uranyl and europium ions on a dry silica gel plate, we dropped a small amount of aqueous solution (~0.5 μL) dissolving the two ions on a dry silica gel plate, and the distributions of the two ions spread on the silica gel plate were observed by photoluminescence microspectroscopy. Photoluminescence images of uranyl and europium ions clearly show that when uranyl ion coexists in the solution, europium ion transfers in a larger area compared to uranyl ion. It can be interpreted that the larger-area distribution of europium ion is caused because uranyl ion is preferentially adsorbed to silica gel and the uranyl adsorption disturbs the adsorption of europium ion. The coexistence of uranyl ion may influence the mobility of other ion species.

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光致发光显微光谱的应用：铀酰和铕离子在干硅胶板上转移的研究

摘要 当水与多孔材料接触时，水和溶解在水中的化学物质会转移到多孔材料内部。在这里，为了研究铀酰和铕离子在干硅胶板上的转移，我们在干硅胶板上滴了少量水溶液（~0.5 μL）溶解这两种离子，这两种离子的分布分布硅胶板上的光致发光显微光谱观察。铀酰和铕离子的光致发光图像清楚地表明，当溶液中同时存在铀酰离子时，与铀酰离子相比，铕离子在更大的区域内转移。可以解释为铕离子的较大面积分布是因为铀酰离子优先吸附在硅胶上，铀酰吸附干扰了铕离子的吸附。