Zhou Lei, Xu Meiyun, Yin Jia, Shui Runjie, Yang Sen, Hua Daoben
State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X) & College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Suzhou 215123, China.
ACS Appl Mater Interfaces. 2021 Feb 10;13(5):6322-6330. doi: 10.1021/acsami.0c21207. Epub 2021 Jan 28.
Separation of uranium and cesium from low-level radioactive effluents (LLRE) is of great significance for sustainable development of the nuclear industry and for the environment. However, high salinity and massive coexisting ions of LLRE are giant challenges for the separation. To address the challenges, we report a strategy for efficient and simultaneous separation of uranium and cesium from a high-salt environment by dual ion-imprinted mesoporous silica based on multiple interactions. The as-prepared adsorbents can reach equilibrium for uranium and cesium within 1 h with a maximum capacity of 221.7 mg U g and 34.5 mg Cs g. The sorption mechanism demonstrates that the highly active phenolic hydroxyl groups of imprinted cavities can extract uranium and cesium effectively through multiple interactions, including coulomb attraction, redox, ion exchange, and complexation. The synergism of multiple interactions and imprinted cavity endows the sorbent with good selectivity for uranium and cesium over other cations and with excellent salt tolerance. This work demonstrates a new strategy of selective extraction of nuclides by multifunction adsorbent through multiple interactions.
从低放废液（LLRE）中分离铀和铯对于核工业的可持续发展以及环境保护具有重要意义。然而，低放废液的高盐度和大量共存离子给分离带来了巨大挑战。为应对这些挑战，我们报道了一种基于多重相互作用的双离子印迹介孔二氧化硅策略，用于在高盐环境中高效同时分离铀和铯。所制备的吸附剂对铀和铯在1小时内即可达到平衡，最大吸附容量分别为221.7 mg U/g和34.5 mg Cs/g。吸附机理表明，印迹孔穴中高活性的酚羟基可通过库仑吸引、氧化还原、离子交换和络合等多重相互作用有效地萃取铀和铯。多重相互作用与印迹孔穴的协同作用赋予吸附剂对铀和铯相对于其他阳离子具有良好的选择性以及出色的耐盐性。这项工作展示了一种通过多功能吸附剂利用多重相互作用选择性萃取核素的新策略。
