School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China.
College of Mechanical and Electrical Engineering, Qingdao University, Qingdao, 266071, Shandong, China.
J Environ Manage. 2024 Jan 1;349:119347. doi: 10.1016/j.jenvman.2023.119347. Epub 2023 Oct 27.
U(VI)-containing acidic wastewater produced from uranium mining sites is an environmental hazard. Highly efficient capture of U(VI) from such wastewater is of great significance. In this study, a mesoporous core-shell material (i.e. γ-FeO@meso-SiO) with magnetically and vertically oriented channels was rationally designed through a surfactant-templating method. Batch experiment results showed that the material had an efficiency level of >99.7% in removing U(VI) and a saturated adsorption capacity of approximately 41.40 mg/g, with its adsorption reaching equilibrium in 15 min. The U(VI) adsorption efficiency of the material remained above 90% in a solution with competing ions and in acidic radioactive wastewater, indicating its ability to selectively adsorb U(VI). The material exhibited high adsorption efficiency and desorption efficiency in five cycles of desorption and regeneration experiments. According to the results, the mechanism through which γ-FeO@meso-SiO adsorbs U(VI) was dominated by chemical complexation and electrostatic attraction between these two substances. Therefore, γ-FeO@meso-SiO is not only beneficial to control the environmental migration of uranium, but also has good selective adsorption and repeated regeneration performance when used to recover U(VI) from weakly acidic wastewater in uranium mining.
含铀酸性废水是铀矿开采过程中产生的一种环境危害物，高效去除废水中的铀（VI）具有重要意义。本研究通过表面活性剂模板法，合理设计了一种具有磁性和垂直取向通道的介孔核壳材料（γ-FeO@meso-SiO）。批实验结果表明，该材料去除铀（VI）的效率大于 99.7%，饱和吸附容量约为 41.40mg/g，吸附 15min 即可达到平衡。在有竞争离子和酸性放射性废水中，该材料对铀（VI）的吸附效率仍保持在 90%以上，表明其具有选择性吸附铀（VI）的能力。在 5 次解吸和再生实验中，该材料表现出较高的吸附效率和解吸效率。根据实验结果，γ-FeO@meso-SiO 吸附铀（VI）的机制主要是这两种物质之间的化学络合和静电吸引。因此，γ-FeO@meso-SiO 不仅有利于控制铀的环境迁移，而且在用于从铀矿开采的弱酸性废水中回收铀（VI）时，还具有良好的选择性吸附和重复再生性能。
