چكيده به لاتين
Nowadays, the treatment of pharmaceutical wastewater is of utmost importance due to its significant negative impact on human health and the environment. Photocatalytic degradation processes and membrane filtration systems are known as the most effective methods for treating pharmaceutical wastewater. Recently, metal-organic frameworks (MOFs) have gained attention for their potential in fabricating photocatalysts and nanocomposite thin film membranes. In this thesis, the potential of a composite photocatalyst consisting of MIL-101 (Fe)-NH2/titanium dioxide/zero-valent iron nanoparticles/molybdenum disulfide quantum dots was investigated for the removal of fluoxetine hydrochloride (FLX) and paroxetine hydrochloride (PRX) from water. Thin film nanocomposite membranes based on MIL-101 (Fe) and MIL-101 (Fe)-NH2 were prepared by loading them in the aqueous and organic phases of interfacial polymerization solutions, and their performance was optimized for the removal of FLX and PRX from aqueous wastewater. The combined membrane-photocatalytic system was also studied for the removal of FLX, sertraline (STL), and PRX from aqueous solutions. The properties of the synthesized photocatalysts and membranes were characterized using various techniques such as scanning electron microscopy, X-ray diffraction spectroscopy, nitrogen adsorption and desorption isotherm, X-ray photoelectron spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, fluorescence spectroscopy, and electrochemical impedance spectroscopy. The results showed that in the presence of persulfate, the removal efficiency of FLX and PRX using the synthesized photocatalyst reached above 99% after only 20 min, with a concentration of 0.5 g/L photocatalyst, 2 mM sodium persulfate, and an initial concentration of 100 mg/L. The flux and removal percentage of FLX, STL, and PRX using the membrane loaded with 0.004 wt% of the MOFs were 51.3 L/m2.h and 98.92%, 50.4 L/m2.h and 98.65%, and 51.8 L/m2.h and 99.02%, respectively. These results demonstrate the potential of the combined nanofiltration-photocatalytic system using the photocatalyst and the thin film nanocomposite membrane based on the MOFs for the effective removal of pharmaceutical contaminants on an industrial scale.
