Yang Aili, Wang Zhijun, Zhu Yukuan
Institute of Materials, China Academy of Engineering Physics, Jiangyou Sichuan, 621907, China.
Sci Rep. 2020 Nov 6;10(1):19271. doi: 10.1038/s41598-020-76173-4.
A novel composite MOF@cotton fibre (HCF) was prepared and characterized by FTIR, SEM, XPS and TGA. The effect of various parameters on the adsorption efficiency, such as the solution pH, contact time, initial U(VI) concentration and temperature, was studied. The maximal sorption capacity (Q) is 241.28 mg g at pH 3.0 for U(VI) according to the Langmuir isotherm adsorption model, and the kinetic and thermodynamic data reveal a relatively fast entropy-driven process (ΔH = 13.47 kJ mol and ΔS = 75.47 J K mol). The removal efficiency of U(VI) by HCF is comparable with that of pure cotton fibre and as-prepared MOF (noted as HST). However, the HST composite with cotton fibre significantly improved the treatment process of U(VI) from aqueous solutions in view of higher removal efficiency, lower cost and faster solid-liquid separation. Recycling experiments showed that HCF can be used up to five times with less than 10% efficiency loss.
制备了一种新型复合金属有机框架@棉纤维（HCF），并通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）和热重分析（TGA）对其进行了表征。研究了溶液pH值、接触时间、初始U(VI)浓度和温度等各种参数对吸附效率的影响。根据朗缪尔等温吸附模型，在pH 3.0时，U(VI)的最大吸附容量（Q）为241.28 mg/g，动力学和热力学数据表明这是一个相对较快的熵驱动过程（ΔH = 13.47 kJ/mol，ΔS = 75.47 J/(K·mol)）。HCF对U(VI)的去除效率与纯棉纤维和制备的金属有机框架（记为HST）相当。然而，考虑到更高的去除效率、更低的成本和更快的固液分离，HST与棉纤维的复合材料显著改善了从水溶液中处理U(VI)的过程。循环实验表明，HCF可重复使用多达五次，效率损失小于10%。
