State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, PR China.
State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, PR China; Division of Target Science and Fabrication, Research Center of Laser Fusion, China Academy of Engineering Physics, P. O. Box 919-987, Mianyang 621900, PR China.
J Hazard Mater. 2022 Feb 5;423(Pt B):127184. doi: 10.1016/j.jhazmat.2021.127184. Epub 2021 Sep 10.
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 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.
为了保护环境和节约铀资源，有必要寻找一种从废水中回收铀的高效吸附剂。在这项工作中，我们使用冷冻干燥-煅烧法合成了 HAP 气凝胶，以有效地去除铀。与市售的纳米羟基磷灰石相比，HAP 气凝胶表现出更好的吸附性能。这是因为所制备的 HAP 气凝胶具有连续的多孔结构，可为铀的吸附提供更多的活性位点。在 pH = 4.0 和 298 K 下，HAP 气凝胶在 10 min 内的铀去除效率达到 99.4%，最大吸附容量高达 2087.6 mg g。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、有潜力的吸附剂。
