Thin-Film Composite Membrane Prepared by Interfacial Polymerization on the Integrated ZIF-L Nanosheets Interface for Pervaporation Dehydration

Abstract

Thin-film composite (TFC) membranes are attracting wide attention because their ultrathin selective layer usually corresponds to the higher membrane flux for pervaporation. However, the direct preparation of the TFC membranes on ceramic substrates confronted with the great difficulties because the larger pores on ceramic substrate surfaces are detrimental to the formation of an intact polyamide (PA) selective layer produced by interfacial polymerization (IP) reaction. Here, the integrated ZIF-L nanosheets were proposed to be used as an assistance interlayer for the first time to eliminate the existence of the pores of the ceramic support, and provides a better basis for the formation of an intact PA selective layer by IP reaction between TMC and ethylenediamine (EDA). The experimental data obtained in pervaporation (PV) show that the increased flux from 1.1 to 2.9 kg/m 2 h corresponds to the decreased separation factor from 396 to 110 when the feed concentration of ethanol decreases from 95 wt % to 80 wt % at 50 °C. In addition, the membrane flux increases from 0.8 to 2.5 kg/m 2 h with a change of the separation factor from 683 to 111 when the operational temperature varies from 30 to 60 °C. These results demonstrate the great potential of the fabricated TFC membranes in practical application for PV dehydration of organic solutions.

Metal/covalent–organic framework based thin film nanocomposite membranes for advanced separations

“…The TFC membrane used for pervaporation was shown to effectively remove water from ethanol. Zhang et al 239 utilized vacuum-assisted filtration technology to select micrometer-sized ZIF-L nanosheets and construct an intermediate layer between the PA layer and the inorganic support. This interlayer served two functions: (i) compensating for defects generated by the macro-porous substrate; (ii) providing a suitable platform for the subsequent IP reaction.…”

Facile Synthesis of Organic Template-Free Chabazite Zeolite-Coated Kaolin Ceramic Membrane for Continuous Separation of Cerium from Aqueous Solutions

“…24 An α-alumina membrane was used as a support to prepare a defect-free CHA zeolite-coated ceramic composite membrane for gas separation applications. 15,22 CHA zeolite seeds were successfully coated on an α-alumina support using vacuum-assisted infiltration followed by hydrothermal treatment by Kim et al (2021) in order to prepare a composite membrane for pervaporation applications. 25 Among the various methods of producing CHA-type zeolites, the direct crystallization technique has gained immense popularity among researchers.…”

“…Generally, the CHA zeolite is coated on an α-alumina support and these membranes are often used for gas separation applications. , Maghsoudi and Soltanieh (2014) prepared a composite membrane by coating a CHA-type zeolite on an α-alumina support at a synthesis temperature of 150 °C for 40 h, which was further tested for the separation of CO 2 and H 2 S from CH 4 . An α-alumina membrane was used as a support to prepare a defect-free CHA zeolite-coated ceramic composite membrane for gas separation applications. , CHA zeolite seeds were successfully coated on an α-alumina support using vacuum-assisted infiltration followed by hydrothermal treatment by Kim et al (2021) in order to prepare a composite membrane for pervaporation applications …”