تهيه زغال زيستي فعال شده با اسيد از پوسته دانه كاج و كاربرد آن به‌عنوان جاذب براي حذف سفكسيم از محلول‌هاي آبي

In this research, an acid-activated biochar adsorbent synthesized based on the pine seed coat. It was applied for the removal of cefixime from aqueous solutions containing cefixime 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 304.21 m2.g-1. In addition, the average pore size for this adsorbent was 1.45 nm. Next, the effect of various parameters on cefixime adsorption, including pH, contact time, initial concentration of cefixime molecules in aqueous solution, an‎d temperature, was investigated. The synthesized adsorbent for the removal of cefixime molecules at pH 2 showed the highest removal efficiency of 97% from the real solution using 0.5 g of the synthesized adsorbent. In the cefixime removal process, an equilibrium time of 30 minutes was observed for the synthesized adsorbent. Also, the adsorption kinetic data were in the best agreement with the pseudo-second-order kinetic model an‎d its adsorption isotherm data with the Langmuir isotherm model. The maximum adsorption capacity of cefixime under optimal conditions based on the Langmuir model was 3.22 mg.g-1. The adsorbent recovery parameter was investigated an‎d by the fourth use, when using sodium hydroxide solution, the removal efficiency increased to above 80; however, when using hydrochloric acid solution, the removal percentage did not change much. The proposed adsorbent has the potential to be used as a practical adsorbent for the removal of cefixime, considering its biocompatibility an‎d economic advantages.

كيومرث زرگوش

اسماعيل حيدري , كاظم كرمي