نوع مقاله : پژوهشی
نویسندگان
اصفهان، دانشگاه اصفهان، دانشکده فنی و مهندسی، گروه مهندسی شیمی، کد پستی 8174673441
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Hypothesis:
Oil wastewater pollution and the presence of water in oil create significant environmental challenges and affect oil transportation processes, including damage to aquatic ecosystems and corrosion of transfer equipment. Therefore, in this study, polyacrylonitrile membranes with the addition of dopamine (to increase hydrophilicity) and nanostructures ZIF-8 and ZIF-67 (for controlled hydrophobicity) were fabricated, and their performance in separating water/oil emulsions was evaluated.
Methods:
In this study, dual-layer nanocomposite membranes consisting of a polyacrylonitrile substrate and an active polyamide layer were prepared. The active polyamide layer was created using the interfacial polymerization method on the substrate, and for modification, dopamine and nanostructures ZIF-8 and ZIF-67 were used. Fabricated membranes were characterized by ATR-FTIR, SEM, AFM, contact angle, and porosity, while their filtration performance was assessed based on flux, selectivity, and filtration resistance.
Findings:
The results show that polyamide coating and the addition of dopamine, due to the hydrophilic nature of NH and OH groups, reduced the organic phase flux. On the other hand, the addition of hydrophobic nanostructures ZIF-8 and ZIF-67 enhanced the organic phase flux by increasing surface roughness and lipophilicity. Furthermore, the flux recovery in the M (0,0) membrane was less than 20%, while with polyamide coating and the addition of dopamine, the flux recovery in the PAN/PA (DA,0) membrane increased to 55%. The flux recovery of the hydrophobic PAN/PA (DA, Z267) membrane reached an acceptable value of 96%. Additionally, the water selectivity in the PAN/PA (0, 0) and PAN/PA (DA, 0) membranes was calculated to be 51 and 56, respectively, while for the pristine membrane it was 2.22. These nanostructures also increased the selectivity of the organic phase due to the presence of hydrophobic 2-methylimidazole groups, and dopamine enhanced this effect, increasing the value from 4.9 for the raw to 175 for the PAN/PA (DA, Z267) membrane.
کلیدواژهها [English]
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