Facile Synthesis of Oriented Zr–MOF Membrane under Complete Room-Temperature Condition with Superb Selectivity for Carbon Capture
Jiahui Yan, Yanwei Sun, Taotao Ji, Yi Liu, Yi Liu, Nan Zhang, Bingbing Sun, Shengyan Meng, Hang Yin, Mingming Wu, Haoquan Hu, Yi Liu, Yi Liu
Abstract
Owing to their tailorable structure deficiencies and intrinsic framework robustness, Zr–MOF membranes hold great promise in energy-efficient separation of diverse industrially important gas mixture, while their complete room-temperature (RT) production is extremely advantageous for large-scale application. Herein, we reported a facile complete RT protocol for preparing (111)-oriented UiO-66 membranes with CPO 111/002 of 7.4 on ZrO 2 buffer layer-modified porous α-Al 2 O 3 substrate with a Zr( n -OPr) 4 source. Experimental results indicated that carrying out the reaction at RT resulted in higher missing-linker numbers in the UiO-66 framework (1.5 per Zr 6 formula unit) and therefore higher CO 2 /N 2 adsorption selectivity, attributing to higher affinity interaction between CO 2 and defective sites in Zr 6 -oxo cluster nodes. Benefiting from high linker deficiencies and low inter-crystalline defects, the ideal selectivity of CO 2 /N 2 (36.5) on the prepared membrane was superior to the majority of polycrystalline MOF membranes measured under comparable conditions; moreover, unlike other hydrophilic membranes, our membrane manifested steady CO 2 /N 2 separation performance under moisture conditions. The above reproducible protocol provides an appealing solution for alleviating residual concerns hindering the large-scale production of high-performance Zr–MOF membranes.