The selective and efficient cesium recovery from natural brines resources is a significant and challenging issue. Here we reported a green method for the facile construction of mesoporous Prussian blue analogs (PB) through an ionic liquid-assisted strategy and used for cesium recovery from salt lake brines and geothermal water. The unique nanostructures endowed this mesoporous PB with the improved cesium adsorption capacity (548.7 mg/g), which was 1.5-times as that of conventional PB (362.8 mg/g), placing it at the top level of cesium adsorbents. The adsorption experiments in salt lake brines and geothermal water were conducted and the adsorption efficiency of Cs⁺ exceeded 90%, while those for other co-existing cations were <4.2%, demonstrating its favorable selectivity in cesium recovery from multicomponent aqueous solutions. The benign adsorption performance and adsorption-desorption stability make it a potential candidate for the sustainable recovery of cesium from different kinds of Cs-containing water resources.

从天然卤水资源中选择性高效地回收铯是一个重要且具有挑战性的问题。在这里，我们报道了一种通过离子液体辅助策略轻松构建介孔普鲁士蓝类似物 (PB) 的绿色方法，并用于从盐湖卤水和地热水中回收铯。独特的纳米结构赋予了这种介孔PB更高的铯吸附容量（548.7 mg/g），是传统PB（362.8 mg/g）的1.5倍，处于铯吸附剂的最高水平。进行了盐湖卤水和地热水中的吸附实验以及Cs ^{+的吸附效率}超过 90%，而其他共存阳离子的低于 4.2%，表明其在从多组分水溶液中回收铯方面具有良好的选择性。良好的吸附性能和吸附-解吸稳定性使其成为从不同种类的含Cs水资源中可持续回收铯的潜在候选者。