RETRACTED: Gas separation improvement of <scp>PES</scp> / <scp>PSF</scp> / <scp>PVP</scp> blend mixed matrix membranes inclusive of amorphous <scp>MOFs</scp> by <scp> O <sub>2</sub> </scp> plasma treatment
Simin Asadabadi, Elahe Ahmadi Feijani, Leila Ahmadian‐Alam
Abstract
Abstract In this study, crystalline UiO‐66 and NH 2 ‐UiO‐66 metal organic frameworks (MOFs) were prepared by typical solvothermal method and then were transformed into amorphous phase by using ball milling process. The prepared MOFs were incorporated into tertiary polymer blend matrix including polyethersulfone/polysulfone/polyvinylpyrrollidone (PES/PSF/PVP:40/40/20 wt%) to examine gas separation performance of constructed mixed matrix membranes (MMMs). The synthesized MMMs were analyzed by FT‐IR, SEM, TGA, XRD, AFM, and DSC methods and also by pure gas permeation test for CO 2 and CH 4 gases. Afterwards, the surface of amorphous MOF‐contained MMMs was influenced by O 2 plasma to thrive polar groups of membranes surface. The best gas separation result owned to amorphous NH 2 ‐UiO‐66 comprised MMM treated by O 2 plasma for 3 min at 600 W with CO 2 permeability and CO 2 /CH 4 selectivity of 10.96 Barrer and 97.91, respectively. The mentioned MMM showed CO 2 permeability and CO 2 /CH 4 selectivity of 8.69 Barrer and 75.56 before plasma treatment which were 170 and 50% higher than those of pristine PES/PSF/PVP blend membrane.