Secondary growth synthesis of MOF-5 membranes by dip-coating nano-sized MOF-5 seeds

Abstract

Abstract:

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-Al₂O₃substrate 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 crack-free 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.

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α-Al₂O₃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500～800 nm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

ZHAO Zhenxia, LI Zhong, Jerry Y.S.LIN. Secondary growth synthesis of MOF-5 membranes by dip-coating nano-sized MOF-5 seeds[J]. CIESC Journal, 2011, 62(2): 507-514.

赵祯霞, 李忠, 林跃生. 预置纳米MOF-5晶种二次生长法合成MOF-5膜 [J]. 化工学报, 2011, 62(2): 507-514.

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Secondary growth synthesis of MOF-5 membranes by dip-coating nano-sized MOF-5 seeds

预置纳米MOF-5晶种二次生长法合成MOF-5膜

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