Facile preparation of NiFe2O4/biochar composite adsorbent for efficient adsorption removal of antibiotics in water
Huagen Liang, Chenxi Zhu, Anhu Wang, Fu Chen
Abstract
Abstract The removal of antibiotics by adsorption was considered to be a cheap and efficient treatment method. Herein, magnetic NiFe 2 O 4 /biochar (NFO/BC) composites were prepared by hydrothermal growth of nickel ferrite nanoparticles on sawdust derived biochar. It was found that NFO/BC composites had developed pore structure, rich oxygen-containing functional groups, and strong magnetism. The maximum adsorption capacity of the prepared magnetic composite for tetracycline (TC) was 420.41 mg g −1 . The results of adsorption thermodynamics and adsorption kinetics showed that the adsorption process is a spontaneous process, which conforms to Langmuir model and pseudo second-order kinetic model. The influence experiment of pH and ionic strength confirmed that electrostatic interaction and hydrogen bonding are the key factors affecting the adsorption process. Additionally, pore filling and π-π interaction also existed in the adsorption process of tetracycline. This recyclable magnetic composite provides a feasible research idea for the efficient removal of antibiotics from water. Graphical Abstract