Comparison of Post-Treatment Methods on the Performance of Hollow Fiber Membranes Containing Metal Organic Framework in Gases Separation

Abstract

In the current work, thermal treatment, PDMS coating, and combined thermal treatment with PDMS coating methods were applied over NH2-MIL-53­(Al)/cellulose acetate (CA) hollow fiber mixed matrix membranes (HFMMM) for CO2/CH4 and CO2/N2 separation. The results showed that upon thermal treatment at 170 °C, CO2/CH4 and CO2/N2 gas pair selectivities of HFMMM were improved from 9.1 to 9.9 and 7.7 to 8.4, respectively. On the other hand, CO2/CH4 and CO2/N2 gas pair selectivities of HFMMMs were improved from 9.1 to 14.1 and 7.7 to 12.0, respectively, after thermal treatment at 220 °C. Substantial increment in gas pair selectivities of the thermally treated fibers was mainly due to polymer densification, which condensed the voids between polymer and particles. Subsequently, PDMS-coated HFMMMs exhibited gas pair selectivities of 17.0 and 16.2, respectively, which were higher compared to the untreated and thermally treated HFMMM. Highest improvement of CO2/CH4 and CO2/N2 gas pair selectivities were found for combined post-treated HFMMM with selectivities values of 26.6 and 24.9, respectively. This result was due to the combined effect of polymer densification and penetration of PDMS solution in the CA matrix which contributed to the suppression of nonselective voids. Hence, this work suggests that combined thermal treatment with PDMS coating method could be feasible and efficient for the improvement of performance of HFMMMs in gases separation.

UiO‐66‐NH2 particle size effects on gas separation performance of cellulose acetate composite membranes

“…energy dispersive spectrum mapping of U-100@CA cross-section of N (e) and Zr (f) elements [Color figure can be viewed at wileyonlinelibrary.com] UiO-66-NH 2 are well inherited by composite membrane. 17 In FT-IR spectra (Figure 2d), the absorbance signals for CA carbonyl group (1737 cm À1 for C O stretching vibration) are notable. This band becomes weakened in composite membrane, which might be caused by the crosslink between MOF and CA matrix.…”

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

“…Porous nanofillers such as ZIF-8 [ 197 , 502 , 503 , 504 ], ZIF-71 [ 430 ], Materials of Institute Lavoisier (MIL)-53 [ 505 , 506 ], MIL-125-NH 2 [ 415 ], UiO-66-NH 2 [ 507 , 508 , 509 ], GO [ 171 , 172 ], graphene nanoplatelets [ 91 ], MWCNTs [ 416 ], zeolite-templated carbon [ 510 ], Engelhard titanosilicate-4 (ETS-4) [ 183 , 417 ], carboxylated TiO 2 (c-TiO 2 ) [ 412 , 413 ], amino-functionalized acid activated bentonite clay (Abn-NH) [ 414 ], montmorillonite [ 181 ], and β-cyclodextrin (β-CD) [ 418 , 419 ] are recently reported to fabricate composite hollow fiber membrane for gas and vapor separation. They are incorporated into polymeric hollow fiber membranes either via direct spinning or during fabrication of thin film composite membranes.…”

Separation of CO2 from Small Gas Molecules Using Deca-Dodecasil 3 Rhombohedral (DDR3) Membrane Synthesized via Ultrasonically Assisted Hydrothermal Growth Method

“…H 2 , CO 2 , and CH 4 permeances of 6:50 × 10 −7 mol/m 2-sPa, 6:30 × 10 −7 mol/m 2 sPa, and 1:0 × 10 −7 mol/m 2 sPa were reported, respectively. On the other hand, CO 2 /N 2 and CO 2 /CH 4 selectivities of 45 and 220 were attained [15,16].…”