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Development of high performance amine functionalized zeolitic imidazolate framework ( ZIF ‐8)/cellulose triacetate mixed matrix membranes for CO 2 / CH 4 separation
Author(s) -
Raza Ayesha,
Farrukh Sarah,
Hussain Arshad,
Khan Imran Ullah,
Noor Tayyaba,
Othman Mohd Hafiz Dzarfan,
Yousaf Muhammad Fahad
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5448
Subject(s) - cellulose triacetate , membrane , chemical engineering , zeolitic imidazolate framework , gas separation , barrer , imidazolate , materials science , crystallinity , cellulose , chemistry , polymer chemistry , organic chemistry , metal organic framework , adsorption , biochemistry , engineering
Summary High cost and complex fabrication process of inorganic membranes and lower position of pristine polymeric membranes in the Robeson upper bound curve urged the researchers to develop mixed matrix membranes (MMMs). Cellulose acetate being most commercially used polymer, dominates the market of CO 2 separation mainly because of low cost and environmental friendly resource. In the present study, MMMs consists of amine functionalized zeolitic imidazolate framework (NH 2 ‐ZIF‐8) and cellulose triacetate were fabricated for the first time. NH 2 ‐ZIF‐8 was used as a filler because the pore size of ZIF‐8 is between the kinetic diameter of separating gases (CO 2 and CH 4 ). Moreover, NH 2 group attached on the surface of ZIF‐8 has affinity with condensable gases like CO 2 . Morphology, crystallinity, tensile strength and functional groups of fabricated membranes were investigated using different analytical techniques. Results revealed that the increase of feed pressure has increased CO 2 permeability and decreased permselectivity. However, improvements in gas separation performance were observed with the addition of nanofiller. Best position in Robeson's upper bound curve at 4 bar was obtained with 10 wt% loading with CO 2 permeability and CO 2 /CH 4 permselectivity of 218 barrer and 13.84, respectively. The improvement in the gas separation performance with loading is attributed to the increased diffusion coefficients as well as solubility coefficients, which was increased to 33% and 3.8%, respectively.