Abstract

ABSTRACT A novel adsorbent, amine-functionalized porous silica-coated iron oxide nanoparticles (Fe3O4@SiO2-NH2) was prepared for the removal of cefixime (CFX) and ceftriaxone (CFT) from water. The adsorbent was then characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy, transmission electron microscopy, particle size, surface area and pore size analysis. The particle size, surface area and pore size of amine functionalized silica coated iron oxide are 110 nm, 1073 m2/g and 40 Å, respectively. The effect of adsorbent dose, concentration, time duration, temperature and pH were evaluated. At optimum conditions, the removal efficiency of CFX and CFT was found to be 94.53% and 88.3%, respectively. The adsorption data of CFX and CFT onto Fe3O4@SiO2-NH2 were fully fitted with the Freundlich isotherm and followed pseudo-2nd order kinetic model. The adsorbent has strong interaction with CFX and CFT through hydrogen bonding. The adsorbent was regenerated and reused 30 times, and it was found that the removal efficiency of the adsorbent dropped only by 10%. Owing to high removal efficiency and easy preparation method, Fe3O4@SiO2-NH2 could be used as an efficient nano-adsorbent for the removal of antibiotics and other emerging contaminants from wastewater.

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