添加剂辅助的溶剂热合成多孔配位聚合物MOF-14及其形貌和尺寸调控  

Additive-assisted solvothermal synthesis and properties of porous coordination polymer MOF-14 crystals with controlled morphology and size

作　　者：刘庆[1] 杨吉民[1] 靳黎娜[1] 孙为银[1] 

机构地区：[1]南京大学化学化工学院配位化学研究所配位化学国家重点实验室,南京210023

出　　处：《科学通报》2016年第16期1774-1780,共7页Chinese Science Bulletin

基　　金：国家自然科学基金(21331002;21573106);江苏高校优势学科建设工程项目资助

摘　　要：利用添加剂辅助溶剂热法制备出了形貌和尺寸可控的多孔配位聚合物MOF-14,采用场发射扫描电子显微镜(FESEM)、X射线粉末衍射(XRD)和气体吸附等手段进行了表征.结果表明,分别以醋酸和醋酸钠作为添加剂,可以有效地调控MOF-14产物的形貌和尺寸.气体吸附测试结果表明,所有的MOF-14产物均表现出较大的比表面积和良好的CO_2捕集能力,并对CO_2/N_2具有显著的吸附选择性.同时,MOF-14产物的气体吸附性能受其形貌和尺寸的影响.此外,以醋酸钠为添加剂制备得到的MOF-14产物除了微孔以外还具有介孔,为制备具有介孔的多孔配位聚合物提供依据.Meta-organic frameworks（MOFs） or porous coordination polymers（PCPs）,which can be constructed by assembly of organic linkers with metal ions or metal clusters,are an important type of crystalline microporous materials and have attracted considerable attention in the past two decades due to their tailored pore structures,high surface areas and interesting properties such as gas adsorption,storage and separation,catalysis,molecular or ionic sensing as well as drug release. Nowadays remarkable research efforts have focused on bulk MOFs,however,for some applications the crystal size and morphology are also very important. In comparison with bulk materials,nanostructured MOFs may exhibit unique shape- and size-dependent properties,and also have superior properties than the bulk MOFs. However,due to the variety of MOFs structures and the poor understanding of the growth processes of MOFs,the controllable synthesis of nanostructured MOFs still remains a challenge. Therefore,developing efficient synthetic strategies for the tailored fabrication of well-defined nanostructured MOFs materials is highly desirable. In this paper,MOF-14 [Cu_3（BTB）_2]（H_3BTB=4,4′,4″-benzene-1,3,5-triyl-tribenzoic acid） micro/nanocrystals with controllable morphology and size were successfully obtained by additive-assisted solvothermal method. The as-obtained products were characterized by powder X-ray diffraction（PXRD）,field emission scanning electron microscopy（FESEM）,and gas adsorption measurements. Acetic acid and sodium acetate were employed in the reaction system as additives,and found to play an important role in determining the crystal morphology and size. With the amount of acetic acid increased,an evolution of particle morphology from cube,truncated rhombic dodecahedron,to rhombic dodecahedron was observed. Meanwhile,the particle size increased gradually. With the amount of sodium acetate increased,the particle morphology of MOF-14 crystals changed from cube to sphere,and the particle size decreased gradually

关 键 词：MOF-14 添加剂 可控合成 气体吸附 介孔 

分 类 号：O634[理学—高分子化学]