High-efficient tetracycline removal triggered by Fe-based metal organic framework and sequential reutilization of spent adsorbent

Abstract

Adsorption, as an economical and effective strategy, has been widely used for treating antibiotics pollution. However, the rational disposal and limited reutilization of spent adsorbents restricts the practical application. Herein, metal organic framework (MIL-101(Fe)) was fabricated and used to remove antibiotics from aqueous environment. Specifically, the removal rate and adsorption capacity towards TC, a model pollutant, reached 95.54 % ± 1.4 % and 231.04 ± 3.29 mg/g for M-105, respectively. The adsorption mechanism could be ascribed to electrostatic attraction, π-π interaction and hydrogen bonding, pore filling and complexation identified with experimental results and spectroscopic analysis. The spent adsorbent was further annealed to Fe/Fe₃C/carbon composite, which possessed high-efficient microwave absorption performance due to good dielectric property. This work identifies MIL-101(Fe), obtained with a simple fabrication method, could be employed as a high-efficient adsorbent in TC removal and offers a novel strategy for reusing spent adsorbent in microwave absorption field.