PIM-1 membranes containing POSS - graphene oxide for CO2 separation

https://doi.org/10.1016/j.seppur.2022.121447Get rights and content
Under a Creative Commons license
open access

Highlights

  • PIM-1 mixed matrix membranes (MMMs) were fabricated using POSS functionalized GO as the filler.

  • The prepared membranes were tested for CO2/N2 and CO2/CH4 separation.

  • CO2 permeability of the best performing membrane was 69% higher than the neat PIM-1.

  • Using GO-POSS is an efficient strategy to slow down physical aging.

Abstract

PIM-1 mixed matrix membranes (MMMs) were fabricated with polyhedral oligomeric silsesquioxane (POSS) and graphene oxide (GO) functionalized with POSS (GO-POSS), and tested for CO2/N2 (single gas) and CO2/CH4 (1:1, v:v gas mixture). The CO2 permeability of the best performing fresh MMM (containing 0.05 wt% GO-POSS) was ∼ 12000 Barrer, which is 69% higher than that of the neat PIM-1 membrane, with about the same selectivity (CO2/CH4 selectivity ∼ 12 and CO2/N2 selectivity ∼ 20). In both cases, the gas separation data surpass the 2008 Robeson upper bound. In addition to the initial CO2 permeability enhancement, the use of GO-POSS is an efficient strategy to slow down physical aging. The MMM at a filler loading of 0.75 wt% showed less than half of the reduction in CO2 permeability than the neat PIM-1 membrane 160 days after preparation (26% for the MMM vs 58% for the purely polymeric one).

Keywords

Graphene Oxide
POSS, PIM-1 membrane
Mixed matrix membrane
CO2 separation

Data availability

Data will be made available on request.

Cited by (0)