چكيده به لاتين
In recent decades, disposing of health and pharmaceutical products under the title of emerging pollutants into water sources has brought harmful effects to the environment, human health, and other living organisms. The presence of levofloxacin in water environments, as an example of antibiotics, can cause the creation of antibiotic-resistant bacteria and irreparable damage to humans. Therefore, it is necessary to be able to remove this drug from the aqueous medium. In this thesis, the removal of levofloxacin drug using CE@PAN/GO combined microfunnel is discussed. The cellulose filter paper in the prepared microfunnel form, with a pre-filtration step, filters big molecules and environmental disturbances to some extent. After that, nanofiber/polyacrylonitrile/graphene oxide spun on the filter paper, as the main adsorbent, removes levofloxacin from the aqueous medium using the surface absorption method. The characteristics of the prepared microfunnel were investigated and identified by field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Brunauer-Emmett-Teller test (BET), and zeta potential. Levofloxacin drug removal was studied according to various factors including pH, initial drug errors, and contact time. The results indicated that the highest yield was obtained with a pH of 8.4, an initial concentration of 3 μg/ml, a contact time of 4 hours, and an adsorbent amount of 2 mg/30 ml of levofloxacin solution. The absorption data are in good agreement with the Langmuir isothermal curve pattern. Kinetic data show that drug absorption follows a pseudo-second-order kinetic model. According to the results, the absorption capacity of the levofloxacin drug was 1880.5 mg/g and 41.8% of the drug was removed in aqueous solutions under optimal conditions. The drug was absorbed by the prepared microfunnel with π-π interactions and hydrophobic interactions. In addition, electrostatic interactions between graphene oxide and non-bonding electron pairs also contributed to the absorption process of levofloxacin molecules. The results showed that the combined CE@PAN/GO microfunnel is a suitable adsorbent for the removal of levofloxacin from aqueous solutions.
