中文摘要：

以Zn（O2CCH3）2为锌源采用溶剂热法合成了纳米级金属有机骨架MOF-5晶体,并以此为晶种预置在多孔-αAl2O3载体的表面以形成连续的晶种层,再利用二次生长法制备出超薄且连续的MOF-5晶体膜。实验结果表明：以Zn（O2CCH3）2为锌源所制得的MOF-5晶体能保持了MOF-5的立方体形貌且具有较高的结晶度和比表面积,晶体的颗粒大小均一,尺寸集中在500～800nm范围内,仅以Zn（NO3）2为锌源制得的MOF-5晶体粒径的1/100;以这种纳米级MOF-5为晶种所制得的晶种层的厚度较薄（～4μm）且具有较好的分散性和连续性;经过二次生长后可以得到连续生长的晶体膜。该晶体膜的XRD的特征衍射峰与MOF-5晶粒的特征衍射峰完全相符,这说明膜层上的MOF-5晶体是以无定形方式生长的;SEM照片显示所得的MOF-5晶体膜上的晶体粒径较小且大小均一、晶粒间连接紧密且无明显裂痕,晶膜层生长连续而无明显的裂痕;本文所制得的MOF-5晶体膜层非常薄,厚约为6μm,是目前公开报道的最薄MOFs膜。

英文摘要：

Continuous,crake-free and ultrathin metal organic framework（MOF-5）membranes were prepared on α-Al2O3 supports by the secondary growth method.By changing zinc source from Zn（NO3）2 to Zn（O2CCH3）2,the novel nano-sized MOF-5 crystals could be synthesized in a solvo-thermal process.SEM,XRD and N2 adsorption measurements indicated that the morphology and framework structure of the MOF-5 crystal synthesized by using Zn（O2CCH3）2 matched well with the published SEM image and XRD pattern for the MOF-5,but its crystal size was reduced by two orders of magnitude from ~50 μm—100 μm to ~500 nm—800 nm with a larger surface area.By seeding the nano-sized MOF-5 crystals,a continuous and uniform seeding layer on the porous α-Al2O3 substrate was formed.The SEM micrographs indicated a high density,uniform and adequate coverage of MOF-5 crystals prevailing on α-Al2O3 substrate with the thickness of 4 μm.After secondary growth,an ultrathin,continuous and crackfree MOF-5 membrane was obtained.XRD pattern for the MOF-5 membranes showed the randomly oriented structure of the MOF-5 crystals.XRD data showed that the obtained MOF-5 membrane was densely-packed with randomly oriented MOF-5 crystals.SEM image showed well inter-grown continuous MOF-5 membrane.The membrane thickness was only about 6 μm with invisible inter-crystalline gaps,which was much thinner than the previously reported literatures.