تهيه زغال زيستي از برگ درخت اكاليپتوس و مطالعه عملكرد آن براي حذف انروفلوكساسين از پساب‌هاي دارويي

In this research, with the aim of efficiently removing the antibiotic enrofloxacin from aquatic environments, a biochar adsorbent based on eucalyptus leaf was synthesized an‎d its structural an‎d morphological properties were comprehensively investigated through FT-IR, FE-SEM, EDS, zeta potential, an‎d nitrogen adsorption-desorption tests. Based on the characterization results, the specific surface area of the adsorbent was determined to be 107.2 m2/g, the average pore size was 1.32 nm, an‎d its zeta potential at ph 4 was -6.1 mV, indicating a suitable spatial an‎d electrostatic substrate for contaminant trapping. In the next step, the effect of key parameters such as pH, contact time, initial concentration of enrofloxacin, adsorbent amount, an‎d temperature on the adsorption process was eva‎luated; The results showed that in an acidic environment (pH 4) an‎d a temperature of 30°C, the system equilibrium time was achieved in 60 minutes an‎d with the use of 1 gram of adsorbent, the highest removal efficiency of 97% of the real sample with a concentration of 300.13 mg/L was achieved. On the other han‎d, mathematical modeling proved that the adsorption kinetic data were in the best agreement with the pseudo-second-order model an‎d the isotherm data with the Langmuir model, an‎d accordingly, the maximum monolayer adsorption capacity under optimal conditions was calculated to be 12.39 mg/g. In addition, the study of the effect of interfering ions indicated a significant improvement in efficiency in the presence of carbonate ions due to the salting-out phenomenon, an‎d recovery tests with acid an‎d base showed that the chemical bonds formed were completely irreversible an‎d led to permanent an‎d safe stabilization of the pollutant. Finally, considering the fast kinetics, excellent performance in complex real wastewater matrices, an‎d economic efficiency, this biochar can be considered a green an‎d highly practical option for the definitive removal of enrofloxacin from water sources.

كيومرث زرگوش

اسماعيل حيدري , عليرضا نجفي چرمهيني