双金属同构金属-有机框架材料CAU-21-Al/M的合成、氮气吸附及复合膜性能

Synthesis,N;Adsorption and Mixed-matrix Membrane Performance of Bimetal Isostructural CAU-21

通过掺杂金属的方式实现了双金属同构金属-有机框架材料的制备,采用X射线粉末衍射(PXRD)确定了多种金属在双金属CAU-21材料中的最大掺杂量,使用扫描电子显微镜(SEM)观察了掺杂金属对材料形貌的影响.热重分析(TGA)结果表明,CAU-21系列材料均具有较好的热稳定性.氮气气体吸附测试及以CAU-21-Al/M为填料的混合基质膜对N;气的渗透实验结果与掺杂金属离子尺寸大小呈相反的关系,证实了双金属可实现对孔道结构及气体吸附性能的调控.

The preparation of bimetal isostructural metal-organic frameworks(MOFs)was achieved by doping metals,and the maximum metal doping amounts of CAU-21-Al/M that can maintain the original crystal configuration were obtained from powder X-ray diffraction(PXRD)patterns.Scanning electron microscopy(SEM)was used to observed the influence of doping metals on the morphology of materials,and thermogravimetric analysis(TGA)showed that CAU-21-Al/M(M=Fe,Ga,In,Gd)all had good thermal stability.The results of nitrogen gas adsorptions and the gas permeation experiments of mixed-matrix membranes with CAU-21-Al/M as fillers are inversely related to the size of doped metal ions,verifing that dopping metal can effectively control the pore structure of MOFs.