| With the worldwide increasing demand of energy and reduction of fossil fuelreserves, new energy and technologies are required urgently. The difficulty thatresearchers are facing right now is how to develop new materials with low-energyconsumption and environmental friendliness. Combining the advantages (excellentthermal and chemical stability, unique porous structure) of inorganic materials andmembrane materials (high efficiency and energy conservation), inorganic porousmembranes are currently playing a major role in the field of water treatment, energyand environment. We can expect the broad prospects of them for the development inthe future.Porous materials with ordered one-dimensional channels are very attractive hostsfor design, synthesis and application of various host–guest systems. To ensure the fullutilization of these exceptional properties, the macroscopic ordering of the hostmaterials is of crucial importance as well as the microscopic organization of theguests. In this work, we mainly focus on c-oriented AFI-type zeolite film, which ispromising for its high degree of unity of macro and micro ordering. This promisinghost can be used for diverse practical applications by selecting specific functionalguests. We chose an azo dye (DPPA) as a guest to load into the AFI opened channelsby post-synthetic insertion. Owing to the suitable molecular shape and size, the guest molecules are well confined in the channels. For the first time, this dye-loaded AFIfilm was designed to explore its utility as a sensor for detection of heavy metal ions.This method is quite simple and efficient especially for detection of zinc ions.The introduction of electrospinning technique in synthesis of supportedmicroporous membranes and films opens bright prospects for mass production andrealizing practical applications. This novel and promising strategy has wide suitablerange for various substrates with the possibility of large-area processing. We canprecisely control the thickness of the seed layer and obtain a continuous and uniformseed coating on the support surface. We successfully synthesized several kinds ofmicroporous materials into defect-free and well-intergrown membranes and film ondifferent supports by this method, such as zeolite NaA and pure-silica-zeolite Betamembrane on porous Al2O3tube, zeolite NaY membrane on stainless steel net, zeoliteimidazolate framework-8(ZIF-8) and a metal-organic framework Eu(BTC)(H2O)·DMF (JUC-32) film on porous silica disc. X-ray diffraction (XRD), scanningelectron microscopy (SEM) were used as characterization means and the resultsverified the effectiveness of this new approach in fabrication of membranes and films.Single gas permeance of H2, N2, CH4, CO2and binary mixtures experiments forH2-CO2, H2-CH4, H2-N2were carried out on ZIF-8membrane. The results indicatedthat the ZIF-8membrane prepared through this new approach had better H2selectivityand gas permeability.Cyclohexanone and cyclohexanol are products of selective oxidation ofcyclohexane. They are important industrial intermediates and difficult to be separateddue to their close boiling points. In this work, well-intergrown ZIF-78membrane wassuccessfully synthesized on the porous silica substrate by secondary growth methodand applied for separation of cyclohexanone/cyclohexanol mixture for the first time.Meanwhile, a facile method for seeding procedure was developed by utilizing theamorphous ZIF-78precursors to provide better-distributed nucleation sites. Both XRD and SEM results confirmed the good quality of the membrane. Thepervaporation separation of cyclohexanone/cyclohexanol mixture was carried out atroom temperature with permselectivity of1:2and total flux around8.7×10-2kgm-2h-1. |
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