Investigation of temperature effect on composite membrane synthesis with the growth of nanoparticles of zeolitic imidazolate framework-8 via chemical vapor deposition

Subject Areas :

Hossein Hassannia Golsefid ¹ , Omid Alizadeh ² , Fatereh Dorosti ³

1 - Ph.D Student of Department of Chemistry and Chemical Engineering, Rasht Branch, Islamic Azad University, Rasht, Iran.
2 - Assistant Prof. of Department of Chemistry and Chemical Engineering, Rasht Branch, Islamic Azad University, Rasht, Iran.
3 - Assistant Prof. of Department of Chemistry and Chemical Engineering, Rasht Branch, Islamic Azad University, Rasht, Iran.

Received: 2021-08-10 Accepted : 2021-11-18 Published : 2022-11-22

Keywords: Co, Chemical vapor deposition, polyetherimide, zeolitic imidazolate framework-8,

Abstract :

In this research, polyetherimide (PEI) membranes were made via dry/wet phase inversion with non-solvent water. The effect of the temperature of the casting surface on membrane morphology and CO2 separation from CH4 were studied. Zeolitic imidazolate framework-8 crystals (ZIF-8) were deposited on the PEI membrane with highest selectivity by the chemical vapor deposition (CVD) method to obtain the composite membranes (CM) via a reaction between a complex of zinc and 2-methyl imidazole. The effects of CVD temperature on the fabrication of ZIF-8, CM morphology, and CO2 separation from CH4 were surveyed. The results indicated that an increase in the film casting temperature enhanced CO2 permeation and created a finger-like membrane. Also, this temperature rising reduced the selective layer thickness and surface pores diameters of the PEI membranes. Physical and chemical characteristics of polymeric and the CM were determined using characterization methods. FESEM images and XRD pattern confirmed that ZIF-8 was grown sufficiently on the selective layer of PEI membranes at 50 °C. The fabricated CM, which their selective layer (ZIF-8) was made using atmospheric CVD method at 40, 50, and 70 °C, has higher selectivities of about 21 to 78 percent in comparison with PEI membrane. Selectivity and permeability of the CM fabricated at 100 °C were dramatically reduced. By increasing the temperature to 130 °C, the membrane structure was destructed.

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