Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China.
J Hazard Mater. 2022 Aug 5;435:129022. doi: 10.1016/j.jhazmat.2022.129022. Epub 2022 Apr 27.
A major environmental concern related to nuclear energy is wastewater contaminated with uranium, thus necessitating the development of pollutant-reducing materials with efficiency and effectiveness. Herein, highly selective mesoporous silicas functionalized with amine-bridged diacetamide ligands SBA-15-ABDMA were prepared. Different spectroscopy techniques were used to probe the chemical environment and reactivity of the chelating ligands before and after sorption. The results showed that the functionalized SBA-15-ABDMA had a strong affinity for uranium at low pH (pH = 3) with desirable sorption capacity (68.82 mg/g) and good reusability (> 5). It showed excellent separation performance with a high distribution coefficient (K > 10 mL/g) and separation factors SF > 1000 at a pH of 3.5 in the presence of lanthanide nuclides, alkaline earth metal and transition metal ions. In particular, SiOspheres-ABDMA was used as a column material, which achieved excellent recovery of U(VI) (> 98%) and good reusability for samples of simulated mining and nuclear industries wastewater. XPS and crystallography studies clearly illustrated the tridentate coordination mode of U(VI)/PEABDMA and the mechanism and origin behind the high selectivity for U.
核能相关的一个主要环境问题是被铀污染的废水，因此需要开发高效、有效的减污材料。在此，制备了具有胺桥联二乙酰胺配体 SBA-15-ABDMA 的高选择性介孔硅。使用不同的光谱技术在吸附前后探测螯合配体的化学环境和反应性。结果表明，功能化的 SBA-15-ABDMA 在低 pH（pH = 3）下对铀具有很强的亲和力，具有理想的吸附容量（68.82 mg/g）和良好的可重复使用性（> 5）。在存在镧系元素核素、碱土金属和过渡金属离子的情况下，在 pH 为 3.5 时，它表现出优异的分离性能，具有高分配系数（K > 10 mL/g）和分离因子 SF > 1000。特别是，SiOspheres-ABDMA 被用作柱材料，实现了对模拟采矿和核工业废水中 U(VI)的高回收率（> 98%）和良好的可重复使用性。XPS 和晶体学研究清楚地说明了 U(VI)/PEABDMA 的三齿配位模式以及对 U 高选择性的机制和来源。
