سيما كاظمي

In this research, four novel mixed matrix membranes (MMMs) based on metal-organic frameworks (MOFs) an‎d various polymers were designed an‎d eva‎luated for the removal of pharmaceutical an‎d agricultural pollutants from contaminated wastewater. In the first project, a membrane composed of UiO-66-NH₂ an‎d cellulose acetate was investigated for the removal of three commonly used pharmaceuticals: metronidazole, tetracycline, an‎d rifampin. The membrane demonstrated effective adsorption of the first two drugs with removal efficiencies of 88.74% an‎d 74.91%, respectively. However, the adsorption efficiency for rifampin was significantly lower (28.3%), attributed to its bulky molecular structure an‎d limited diffusion through the membrane pores. In the second project, ZIF-67 was grown in situ on polyacrylonitrile (PAN) chains, resulting in a high-performance nanofibrous membrane for the adsorption of acetaminophen (89.9%) an‎d ibuprofen (96%). The in situ growth technique led to uniform nanoparticle dispersion, reduced fiber diameter, an‎d enhanced active surface area, demonstrating the superiority of this method over conventional nanoparticle blending approaches. The third project involved the fabrication of an electrospun membrane composed of NH₂-MIL-101(Cr) an‎d PAN for the removal of the herbicide trifluralin. This membrane achieved a rapid adsorption efficiency of 95.08% within 15 minutes. Experimental data were well-fitted by the Freundlich an‎d pseudo-second-order kinetic models, an‎d the membrane exhibited good stability over multiple regeneration cycles. Finally, a membrane consisting of NH₂-MIL-101(Cr) an‎d cellulose acetate was immobilized on a cotton fabric substrate an‎d used for the removal of gabapentin an‎d sumatriptan. The system achieved removal efficiencies of approximately 94% an‎d 83%, respectively, in under 15 minutes. The rapid an‎d efficient performance was modeled using pseudo-second-order kinetics an‎d Langmuir isotherm, indicating monolayer chemisorption. Overall, this thesis highlights innovative membrane designs an‎d demonstrates the effective an‎d sustainable application of MOF-polymer composites for the treatment of pharmaceutical an‎d agricultural wastewater, offering a promising outlook for the development of green an‎d regenerable water purification technologies.

غشا , چارچوب هاي فلز-آلي , جذب , آنتي بيوتيك , تصفيه آب

Membrane , Metal Organic Frameworks , Adsorption , Antibiotics , Water purification

Sima Kazemi

Dr. Azadeh Tadjarodi