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Step-by-Step Seeding Procedure for Preparing HKUST-1 Membrane on Porous α-Alumina Support

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journal contribution
posted on 19.04.2011, 00:00 by Jiangpu Nan, Xueliang Dong, Wenjin Wang, Wanqin Jin, Nanping Xu
Metal−organic framework (MOF) membranes have attracted considerable attention because of their striking advantages in small-molecule separation. The preparation of an integrated MOF membrane is still a major challenge. Depositing a uniform seed layer on a support for secondary growth is a main route to obtaining an integrated MOF membrane. A novel seeding method to prepare HKUST-1 (known as Cu3(btc)2) membranes on porous α-alumina supports is reported. The in situ production of the seed layer was realized in step-by-step fashion via the coordination of H3btc and Cu2+ on an α-alumina support. The formation process of the seed layer was observed by ultraviolet−visible absorption spectroscopy and atomic force microscopy. An integrated HKUST-1 membrane could be synthesized by the secondary hydrothermal growth on the seeded support. The gas permeation performance of the membrane was evaluated.