Wu Hao, Osawa Naoki, Kubota Masahiko, Kim Seong-Yun
School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
Anal Sci. 2024 Dec;40(12):2287-2293. doi: 10.1007/s44211-024-00666-9. Epub 2024 Sep 20.
In this study, a novel covalent organic framework-modified silica-gel composite (Si-COF) was synthesized for the adsorption of palladium [Pd(II)], zirconium [Zr(IV)], and molybdenum [Mo(VI)] from nitric acid solutions and its adsorption behaviors were systemically investigated under the effects of contact time, nitric acid concentration, solution temperature and others. The pseudo-second-order kinetic model governed the adsorption of these metal ions onto the Si-COF composite, and the Langmuir isotherm model well-matched with the experimental data, with maximum adsorption capacities of 0.588, 0.221, and 0.417 mmol/g for Pd(II), Zr(IV) and Mo(VI), respectively. The adsorption of these metal ions was clarified to originate from the interaction with the abundant nitrogenous groups on the Si-COF composite by the X-ray photoelectron spectroscopy (XPS) method.
在本研究中，合成了一种新型的共价有机框架修饰硅胶复合材料（Si-COF），用于从硝酸溶液中吸附钯[Pd(II)]、锆[Zr(IV)]和钼[Mo(VI)]，并在接触时间、硝酸浓度、溶液温度等影响因素下系统地研究了其吸附行为。准二级动力学模型控制着这些金属离子在Si-COF复合材料上的吸附，Langmuir等温线模型与实验数据拟合良好，Pd(II)、Zr(IV)和Mo(VI)的最大吸附容量分别为0.588、0.221和0.417 mmol/g。通过X射线光电子能谱（XPS）方法阐明了这些金属离子的吸附源于与Si-COF复合材料上丰富含氮基团的相互作用。
