Amira Mohd Nasib
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Preferred name
Amira Mohd Nasib
Official Name
Amira, Mohd Nasib
Alternative Name
Nasib, Amira Mohd
Nasib, A. M.
Nasib, Amira
Main Affiliation
Scopus Author ID
57194113561
Researcher ID
FRP-5803-2022

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Polyvinylidene Fluoride-co-Polytetrafluoroethylene (PVDF-co-PTFE)/Deep Eutectic Solvent (DES) impregnated membrane for carbon dioxide separtion

2019 , Amira Mohd Nasib

Deep Eutectic Solvent (DES) is a new type of organic slovent that have been considered as an attractive liquid medium to be incorporated in liquid membrane (LM) due to high solubility of carbon dioxide (CO₂). However, DES is still considered as a new and fresh liquid, hence the performance of supported-DES-membrane has not been reported yet. Hence, this study aims to synthesize and characterize polyniylidene fluoride-co-polytetrafluoroethylene (PVDF-co-PTFE) membrane, followed by preparation of supported-DES-membrane and evaluating the prepared LM for carbon dioxide/nitrogen (CO2/N2) separation. Asymmetric PVDF-co-PTFE membrane was prepared via phase inversion method using non-solvent induced phase separation (NIPS). The selection of suitable solvent and polymer concentration were studied first for membrane support preparation. Polymer solution prepared by using N,N-dimethylacetamide (DMAc) showed the lowest viscosity (7800 cP) and hence, produce a membrane with a larger size (115.0 μm) and high quantity of finger-like macrovoids with highest porosity (57.6%) compared with other solvents. Meanwhile, increasing of polymer concentration resulted in lower porosity due to decreasing of macrovoids pore size shown by scanning electron microscope (SEM) micrograph. Furthermore, DES was prepared by the mixing of choline chloride (ChCI) and ethylene glycol (EG), then impregnated into the membrane matrix via vacuum method. In order to increase DES loading,selection and addition of pore additives as well as manipulating the coagulant bath medium were carried out. The CO₂ separation performance of LM was tested using gas permeation at variation of pressure and flow rate. The membrane characterizations as well as gas permeation test results showed that supported-DES-membrane fabricated by using 6 wt.% polyethylene glycol (PEG), 20wt.% polymer and 74 wt.% DMAc in a polymer solution and having a mixture of 25 wt. % of ethanol and 75 wt. % distilled water as a coagulant bath shows the highest porosity with a combination of finger and sponge-like microstructure. From energy dispersive X-ray spectrometer (EDX) and SEM analysis, the respected membrane was able to hold DES at the highest percentage. The optimum CO₂ permeability recorded in this study was 4.41 x 10`6 barrer with CO₂/N2 selectivity at 8.28. Gas separation performance using DES as a solvent in LM demonstrated 99% better as compared to conventional ionic liquid, but a bit lower in terms of CO₂/N2 selectivity. Hence, the promising result obtained in this study demonstrates the potential of DES for gas separation, especially in CO₂ separation.

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Preparation of supported-deep eutectic solvent membranes: Effects of bath medium composition on the structure and performance of supported-deep eutectic solvent membrane for CO2/N2 gas separation

2020-05-01 , Amira Mohd Nasib , Mohd Irfan Hatim Mohamed Dzahir , Nora Jullok , Mohamad Syahmie Mohamad Rasidi

Polyvinylidene fluoride-co-polytetrafluoroethylene, PVDF-co-PTFE polymer was used as a membrane support. The asymmetric membranes were formed by immersion of casted membrane film into the coagulation bath. This work manipulated the coagulant bath medium by mixing ethanol with distilled water at different weight percentages (0, 25 and 50 wt. % of ethanol). The structures of fabricated membranes were observed to have different morphologies. Higher ethanol content altered the membrane structure from finger-like to sponge-like structure, and hence differed in membrane porosity. Vacuum-based technique was chosen to impregnate the deep eutectic solvent (DES) into the pores of membrane support. DES was prepared by mixing choline chloride (ChCl) and ethylene glycol at a ratio of 1:3. Scanning electron microscopy (SEM) was used to study the membrane morphology changes while in order to determine the immobilization of DES, energy dispersive X-ray (EDX) analysis was used. The porosity of fabricated PVDF-co-PTFE membrane was determined by means of gravimetric method. Lastly, the membrane separation performance using CO2 and N2 gasses were used to determine the capability of the supported-DES-membrane. The results demonstrated the highest immobilization of DES in supported membrane pores was achieved when combination of 25 wt. % of ethanol and 75 wt. % distilled water was used as a coagulant bath medium. The respective membrane has 74.5% porosity with the most excellent performance of CO2 separation at 25.5 x 103 GPU with CO2/N2 selectivity of 2.89.

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