مهدي اخگري

Antibiotics and toxic heavy metals are being used commonly in bacterial infection treatment and enormous industries respectively. In the present study, a new ‘Green’ environment-friendly Papain grafted magnetic Fe3O4-g-SiO2 core-shell Nano-Sorbent has been synthesized as an active material for effective removal of Levofloxacin and lead cation Pb(II) from aqueous solution. The characterization tools like SEM, EDS, XRD, TGA, and FT-IR spectroscopy clearly implied the successful formation of the nanoscale magnetic particle with Papain coated layer. The batch experiment was performed by altering the key parameters including adsorbent dosage, initial concentration of adsorbate, pH, and contact time. The effectiveness of the synthesized product was eva‎luated by adsorption capacity and removal efficiency. The adsorbent exhibits a superior adsorption capacity of 2445 mg.g-1 for antibiotics (Levofloxacin) and 830 mg.g-1 for lead cations. These results are significantly greater than the previously reported adsorbents. To elucidate the adsorption mechanism, the acquired data were fitted to kinetic and isotherm models. In comparison to the other models, the experimental data for both adsorbates were better fit by the pseudo-second-order model with R2 ≃ 0.999 and the Langmuir isotherm with R2 ≃ 0.999. These results demonstrate that the removal mechanism of Pb(II) ions and Levofloxacin are controlled by the monolayer chemisorption onto the surface of Fe3O4@SiO2@CPTMS@Papain. Moreover, the calculated value for adsorption capacity from kinetic and isotherm studies shows a strong correlation with experimental results. The electrostatic force of attraction, hydrogen bonding, physical adsorption, chelation, and π-π interaction play a major role for the removal of Levofloxacin and Pb(II) ion from aqueous solutions, The adsorbent exhibits reasonable chemical stability and reusability over five cycles.

نانوذرات مغناطيسي , پاپايين , جذب , لووفلوكساسين , فلز سرب , آنتي باكتريال

magnetic nanoparticles , papain , adsorption , lead , levofloxacin

Mahdi akhgari

Dr hossein ghafuri