UO2^2+在水杨醛功能化UiO-66-NH2上的吸附  

Sorption of UO2^2+on Salicylaldehyde-functionalized UiO-66-NH2

作　　者：李博林 代爽 罗婷[1] 王海军[1] 李新政[1,2] 曹其如 刘东彬 张杰 Li Bolin;Dai Shuang;Luo Ting;Wang Haijun;Li Xinzheng;Cao Qiru;Liu Dongbin;Zhang Jie(Nuclear Power Institute of China,Chengdu 610005;Sichuan Engineering Laboratory for Nuclear Facilities Decommissioning and Radwaste Management,Chengdu 610041,China)

机构地区：[1]中国核动力研究设计院,四川成都610005 [2]四川省核设施退役及放射性废物治理工程实验室,四川成都610041

出　　处：《广东化工》2020年第12期261-265,共5页Guangdong Chemical Industry

摘　　要：通过溶剂热法合成了水杨醛功能化修饰的金属有机骨架化合物UiO-66-Sal,采用傅里叶红外谱图(FT-IR)、X射线粉末衍射(XRD)、13C固体核磁(13C CP-MAS NUM)、比表面分析(N2B.E.T)和元素分析等手段对所合成的样品进行了表征。采用静态批式法对比研究了UO2^2+在未功能化的UiO-66-NH2和水杨醛功能化UiO-66-Sal上的吸附行为。结果表明,水杨醛功能化基团的引入仅使UiO-66-NH2的表面积和孔体积有所减小,其孔结构并未被破坏,但对UO2^2+的吸附能力显著增强;室温下,水杨醛功能化UiO-66-Sal对UO2^2+的吸附能力优于未功能化的UiO-66-NH2,其最大吸附容量为2.01×10^-4 mol/g;UO2^2+在UiO-66-NH2和UiO-66-Sal上的吸附均较为迅速,150 min达到吸附平衡,均符合准二级吸附动力学模型;吸附过程几乎不受离子强度的影响但受pH的影响较为显著,吸附为吸热过程;在一系列干扰离子存在下,水杨醛功能化的UiO-66-Sal对UO2^2+具有良好的吸附选择性。The Salicylaldehyde-functionalized Metal Organic Frameworks UiO-66-NH2 was prepared by a solvent heat method,and characterized by Fourier Transform Infrared Spectroscopy(FT-IR),X-ray Diffraction(XRD),Solid state nuclear magnetic(13C CP-MAS NUM)spectra,Brunner−Emmet−Teller(BET)measurements,and elemental analysis.The sorption of UO2^2+on UiO-66-NH2 and salicylaldehyde-functionalized UiO-66-NH2 was investigated by a batch method.The results indicated that the pore structure of salicylaldehyde-functionalized UiO-66-Sal was the same as UiO-66-NH2,but the pore volume and BET surface area decreased.Compared to UiO-66-NH2,the sorption ability of salicylaldehyde-functionalized UiO-66-Sal for UO2^2+was obviously increased.UiO-66-Sal had the highest adsorption capacity of 2.01×10^-4 mol/g for UO2^2+,the sorption process was endothermic and followed a pseudo-second-order type sorption kinetics for all materials.In addition,UO2^2+adsorption depended strongly on pH,but the effect of ionic strength was weak.Salicylaldehyde-functionalized UiO-66-Sal exhibited high selectivity and a better sorption ability for UO2^2+over a series of competing metal ions.

关 键 词：UiO-66-NH2 UO2^2+ 水杨醛 吸附 

分 类 号：O6[理学—化学]