Fabrication of a Kagomé‐type MOF Membrane by Seeded Growth on Amino‐functionalized Porous Al₂O₃ Substrate

Abstract

In this study, we report an efficient fabrication method for the membrane of a metal‐organic framework (MOF) (Kgm−OEt) which is one kind of kagomé‐type MOF with a two‐dimensional (2D) sheet structure having one‐dimensional (1D) channels suitable for separation of H2 from other larger gases. The Kgm−OEt seed layer was created on an Al2O3 substrate using layer‐by‐layer (LBL) growth, then a membrane was fabricated by secondary growth. The membrane on a 3‐aminopropyltriethoxysilane (APTEs)‐treated substrate obtained in this method was continuous and defect‐free with the crystal orientation suitable for gas transportation, while the membrane grown on an unmodified substrate was loosely packed with unfavorable crystal orientation.

Review of Synthesis and Separation Application of Metal-Organic Framework-Based Mixed-Matrix Membranes

“…After secondary growth, the Kgm-OEt membrane could be obtained. During this process, membranes grown on the APETs-treated substrates were continuous and defect-free and had an orientation suitable for gas transmission [18]. Some researchers attempted to perform secondary growth at low temperatures.…”

“…Commonly used methods of preparation of MOF membranes include the in situ growth method [17], secondary growth method [18], and electrochemical methods [19]. Each method has its unique advantages: for example, the in situ growth method can obtain high-quality single crystals and the preparation method is simple; the secondary growth method can control the final orientation of the membrane and obtain a dense membrane; and the electrochemical method requires a lower synthesis temperature (Figure 1) [20][21][22][23][24][25].…”

Metal–organic frameworks on versatile substrates

“…Porous alumina hollow bers are selected as substrates to fabricate MOFs with their costefficiency, heat resistance, non-toxicity, and good chemical stability. [230][231][232][233][234][235][236][237][238][239][240][241][242][243][244][245][246] ZrCl 4 and H 2 BDC were rst dissolved in deionized water and DMF at a molar ratio of metal salt/ligand/H 2 O/ DMF of 1 : 1 : 1 : 500 and kept at 120 °C for three days. Aer that, a UiO-66 lm was obtained on substrate Al 2 O 3 as depicted in Fig.…”