Removal of tetracycline from aqueous solution using Fe‑doped zeolite

Tetracycline is one of the most widely used antibiotics that causes contamination of aqueous environments and has raised serious concern during the past few years. In this work, adsorption of tetracycline on a modifed zeolite was studied through a batch system. Synthetic zeolite 13X was modifed using Fe(III). The results show that the removal efciency of tetracycline by modifed zeolite has considerably increased. Diferent experiments were carried out in order to analyze the efect of parameters such as pH, initial concentration of tetracycline, time, etc. The results indicate that tetracycline adsorption on the zeolite strongly depends on the pH of the solution due to amphoteric functional groups of tetracycline and maximum adsorption capacity of tetracycline by modifed zeolite with a pH of approximately 6. The Langmuir isotherm shows good agreement with the experimental data suggesting monolayer adsorption. Maximum adsorption capacity of the modifed zeolite reached at the experiments is almost 200 mg/g. XRD, XRF and FTIR results confrm the existence of the Fe phase in the zeolite texture. Amide groups of TC were responsible for the complexation with Fe3+. Also, tetracycline removal was studied in a continuous column to simulate an industrial waste water process.