Pei Lei, Zhao Xudong, Liu Baosheng, Li Zhengjie, Wei Yinghui
College of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China.
Engineering Research Center for Magnesium Alloy of Shanxi Province, Taiyuan University of Science and Technology, Taiyuan 030024, China.
ACS Appl Mater Interfaces. 2021 Oct 6;13(39):46763-46771. doi: 10.1021/acsami.1c14302. Epub 2021 Sep 25.
The adsorption and recovery of dysprosium ions (Dy) from industrial wastewater are necessary but still challenging. Herein, we constructed a series of defect-containing metal-organic frameworks (MOFs) [UiO-66-(COOH)] using sodium benzoate (BCNa) as a modulator. Upon the formation of defects, the porosity and surface charge properties of the MOFs were improved, leading to a higher utilization ratio of active groups and higher adsorption capacities for Dy. The synthesized UiO-66-(COOH)-B10 with an optimal addition of BCNa exhibited a superior adsorption capacity of 150.6 mg g. Fast adsorption occurred at ∼5 min, and equilibrium was reached at ∼60 min. Higher pH and temperature were found to be beneficial for boosting Dy adsorption, and selective adsorption over other metal ions was achieved in a multicomponent solution. Further, FTIR spectroscopy and XPS investigations indicate that free carboxyl contributes to the capture of Dy. Thus, this work provides a promising strategy to enhance the utilization ratio of active groups and further adsorption performance.
从工业废水中吸附和回收镝离子（Dy）很有必要，但仍具有挑战性。在此，我们使用苯甲酸钠（BCNa）作为调节剂构建了一系列含缺陷的金属有机框架材料（MOFs）[UiO-66-(COOH)]。在形成缺陷后，MOFs的孔隙率和表面电荷性质得到改善，导致活性基团的利用率更高，对Dy的吸附容量也更高。添加最佳量BCNa合成的UiO-66-(COOH)-B10表现出150.6 mg g的优异吸附容量。在约5分钟时快速吸附，约60分钟时达到平衡。发现较高的pH值和温度有利于促进Dy的吸附，并且在多组分溶液中实现了对其他金属离子的选择性吸附。此外，傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）研究表明，游离羧基有助于捕获Dy。因此，这项工作为提高活性基团的利用率和进一步提升吸附性能提供了一种有前景的策略。
