In order to protect environment and save uranium resources, it was necessary to find a highly efficient adsorbent for uranium recovery from wastewater. In this work, we used a freeze-drying-calcination method to synthesize HAP aerogel to effectively remove uranium. Compared with commercially available nano-hydroxyapatite, HAP aerogel presented better adsorption performance. This was because the as-prepared HAP aerogel presented continuous porous structure, which could provide more active sites for the adsorption to uranium. The uranium removal efficiency of HAP aerogel arrived 99.4% within 10 min and the maximum adsorption capacity was up to 2087.6 mg g⁻¹ at pH = 4.0 and 298 K. In addition, the immobilization of uranium on HAP aerogel was chemisorption, which was probably due to adsorption, dissolution-precipitation and ions exchange. These results indicated that the as-prepared HAP aerogel could be widely used as a high efficiency and potential adsorbent for the treatment of uranium-containing wastewater in the future.

为保护环境，节约铀资源，需要寻找一种高效吸附剂从废水中回收铀。在这项工作中，我们使用冷冻干燥-煅烧的方法合成 HAP 气凝胶，以有效去除铀。与市售的纳米羟基磷灰石相比，HAP气凝胶具有更好的吸附性能。这是因为制备的HAP气凝胶呈现出连续的多孔结构，可以为铀的吸附提供更多的活性位点。HAP气凝胶的铀去除效率在10 min内达到99.4%，最大吸附量可达2087.6 mg g ^-1在 pH = 4.0 和 298 K 时。此外，铀在 HAP 气凝胶上的固定是化学吸附，这可能是由于吸附、溶解-沉淀和离子交换。这些结果表明，所制备的HAP气凝胶在未来可广泛用作处理含铀废水的高效和潜在吸附剂。