تهيه زغال زيستي از پسماندهاي توت سفيد و كاربرد آن براي حذف تتراسايكلين از پساب

In this research, biochar adsorbent based on white berry waste was synthesized to be used for the removal of tetracycline from aqueous solutions containing tetracycline molecules. The structural characteristics of the synthesized adsorbent were studied using FT-IR, FE-SEM, EDS, zeta potential, an‎d nitrogen adsorption-desorption tests. Based on the nitrogen adsorption-desorption results, the specific surface area of the biochar adsorbent was obtained to be 3.76 m2/g; in addition, the average pore size of this adsorbent was calculated to be 2 nm. Next, the effect of various parameters, including pH, contact time, initial concentration of tetracycline molecule in aqueous solution, an‎d temperature on the adsorption process was investigated. The adsorbent synthesized at pH 3 showed the highest removal efficiency with 96% of the actual solution an‎d using 0.5 g of adsorbent. The equilibrium time for the tetracycline removal process by this adsorbent was observed to be 40 min. Also, the adsorption kinetic data showed the best agreement with the pseudo-second-order model an‎d the isotherm data with the Langmuir model; the maximum adsorption capacity of tetracycline under optimal conditions, based on the Langmuir model, was 4.19 mg/g. The possibility of recovering the adsorbent was also investigated; so that using sodium hydroxide solution an‎d hydrochloric acid solution showed a decrease in the removal percentage. The proposed adsorbent, considering the advantages of biocompatibility an‎d cost-effectiveness, has a high potential for use as a practical adsorbent in the removal of tetracycline.

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اسماعيل حيدري , عليرضا نجفي چرمهيني