Optimization Removal of the Ceftriaxone Drug from Aqueous Media with Novel Zero‐Valent Iron Supported on Doped Strontium Hexaferrite Nanoparticles by Response Surface Methodology
Shadan Amiri, Mahmoud Reza Sohrabi, Fereshteh Motiee
Abstract
Abstract The present study, a novel and efficient adsorbent nano zero‐valent iron stabilized on strontium hexaferrite (nZVI/SrFe 12 O 19 ) was synthesized for removal of ceftriaxone antibiotic from aqueous solution. Its characteristics were analyzed by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), scanning electron microscopy (SEM), and energy‐dispersive X‐ray spectroscopy (EDX). Response Surface Methodology (RSM) based on Box‐Behnken Design (BBD) were used to achieve the optimal experimental conditions. The effects of parameters such as pH (5‐9), initial concentration of ceftriaxone (5–15 mg L −1 ), and adsorbent dosage (0.05–0.15 g L −1 ) on removal efficiency were investigated. A mathematical model was studied to predict the removal performance. The significance and adequacy of the model were surveyed using analysis of variance (ANOVA). The results showed that second‐order polynomial model is suitable for the prediction removal of ceftriaxone. The highest removal value of mentioned drug were obtained 98 % at adsorbent dosage of 0.15 g L −1 , pH=5, and the pollutant concentration of 10 mg L − 1 . Finally, the isotherms and kinetic studies were evaluated. The Langmuir with R 2 =0.9981 and pseudo‐second‐order with R 2 =0.9996 were the best isotherm and kinetic, respectively. The thermodynamic parameters such as ΔH 0 , ΔS 0 , and ΔG 0 were calculated and it was indicated that adsorption process was exothermic and spontaneous.