School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China.
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Nov;30(53):114569-114581. doi: 10.1007/s11356-023-30321-1. Epub 2023 Oct 20.
A novel and efficient mesoporous nano-absorbent for U(VI) removal was developed through an environment-friendly route by inducing the biomimetic mineralization of hydroxyapatite (HAP) on the bioinspired surface of polydopamine-graphene oxide (PDA-GO). PDA-GO/HAP exhibited the greatly rapid and efficient U(VI) removal within 2 min, and much higher U(VI) adsorption capacity of 433.07 mg·g than that of GO and PDA-GO. The enhanced adsorption capacity was mainly attributed to the synergistic effect of O-H, -C=N-, and PO functional groups and the incorporation of uranyl ions by the formation of a new phase (chernikovite, H(UO)(PO)·8HO). The adsorption process of U(VI) fitted well with pseudo-second-order kinetic and Langmuir isotherm model. Moreover, PDA-GO/HAP showed a high U(VI) adsorption capacity in a broad range of pH values and owned good thermal stability. PDA-GO/HAP with various excellent properties made it a greatly promising adsorbent for extracting uranium. Our work developed a good strategy for constructing fast and efficient uranium-adsorptive biomimetic materials.
通过在仿生多巴胺-氧化石墨烯（PDA-GO）表面诱导羟基磷灰石（HAP）的仿生矿化，开发出一种新颖高效的介孔纳米 U(VI) 吸附剂。PDA-GO/HAP 在 2 分钟内实现了 U(VI) 的快速高效去除，U(VI) 的吸附容量高达 433.07mg·g，远高于 GO 和 PDA-GO。增强的吸附容量主要归因于 O-H、-C=N-和 PO 官能团的协同作用以及新相（砷铀云母，H(UO)(PO)·8HO）中铀酰离子的掺入。U(VI) 的吸附过程很好地符合拟二级动力学和 Langmuir 等温线模型。此外，PDA-GO/HAP 在较宽的 pH 值范围内具有较高的 U(VI) 吸附容量，且具有良好的热稳定性。PDA-GO/HAP 具有多种优异性能，使其成为一种很有前途的铀吸附仿生材料。我们的工作为构建快速高效的铀吸附仿生材料提供了一种很好的策略。
