Affiliation: | 1. Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
Viet Nam National University, Ho Chi Minh City, Vietnam
Department of Natural Sciences Teacher Education, Dong Thap University, Cao Lanh City, Dong Thap, Vietnam
Contribution: Conceptualization (lead), Data curation (lead), Formal analysis (lead), Methodology (lead), Writing - original draft (equal), Writing - review & editing (equal);2. Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
Viet Nam National University, Ho Chi Minh City, Vietnam
Contribution: Conceptualization (equal), Methodology (equal);3. Department of Natural Sciences Teacher Education, Dong Thap University, Cao Lanh City, Dong Thap, Vietnam
Contribution: Conceptualization (equal), Methodology (equal);4. IT and Lab Center, Dong Thap University, Cao Lanh City, Dong Thap, Vietnam
Contribution: Conceptualization (equal), Methodology (equal);5. Research Affairs Office, Dong Thap University, Cao Lanh City, Dong Thap, Vietnam
Contribution: Conceptualization (equal), Methodology (equal);6. Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
Viet Nam National University, Ho Chi Minh City, Vietnam
Contribution: Conceptualization (lead), Methodology (lead), Supervision (supporting);7. Centre for Herbal Pharmacology and Environmental Sustainability, Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Chennai, Tamil Nadu, India;8. Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam |
Abstract: | In this study, the semi-aromatic polyamide membranes were synthesized by the interfacial polymerization between piperazine (PIP) monomers in the water phase and Benzene-1,3,5-tricarbonyl chloride in the organic phase. To further modify the semi-aromatic pervaporation membrane, the two amino acids, glycine, and l -lysine, were mixed with PIP monomers for interfacial polymerization. The morphology and physicochemical properties of the synthesized membranes were analyzed using Fourier transform infrared (FTIR), field emission scanning electron microscope (FE-SEM), atomic force microscope (AFM), and contact angle measurements. The results show that the semi-aromatic polyamide membranes modified by the two amino acids possess a higher hydrophilic surface and lower thickness compared to the unmodified membrane. Additionally, the permeation flux of the semi-aromatic polyamide membranes was improved by 18.6% and 38.5% as modified with glycine and l -lysine, respectively, at the operating temperature of 70°C when the rejection of both NaCl and arsenic are higher than 99.8%. Furthermore, the operating temperature significantly influenced the permeation flux, while the salt rejections were insignificantly affected. The permeation flux increases by 3.2- and 4.0-folds for glycine and lysine-modified membranes, respectively, when elevating the feed temperature from 40°C to 70°C. The highest permeation flux of 29.5 kg m?2 h?1 with a 5 wt% NaCl rejection of 99.8% was obtained at 70°C by using 0.3 wt% l -lysine modified polyamide (PA) membrane. For elimination of 1.5 mg L?1 As solution at the feed temperature of 70°C, such l -lysine modified PA membrane exhibited the permeation flux of 30.5 kg m?2 h?1 and As rejection of 99.6%, respectively. This work provides a cost-saving, facile, and eco-friendly preparation method for effectively improving the permeation flux while not sacrificing the high rejection of salts of the modified membranes. |