langmuir isotherm

layered double

cd ii

adsorption capacity

maximum adsorption

pb ii

adsorption process

initial concentration

Journal of Hazardous Materials

Efficient removal of antibiotics from aqueous solution is of fundamental importance due to the increasingly severe antibiotic-related pollution. Herein, a high-performance Fe-ZIF-8-500 adsorbent was synthesized by Fe-doping strategy and subsequent activation with high-temperature. In order to evaluate the feasibility of Fe-ZIF-8-500 as an adsorbent for tetracycline (TC) removal, the adsorption properties of Fe-ZIF-8-500 were systematically explored. The results showed that the Fe-ZIF-8-500 exhibited ultrahigh adsorption capacity for TC with a record-high value of 867 mg g -1 . Additionally, the adsorption kinetics and isotherms for TC onto the Fe-ZIF-8-500 can be well-fitted by the pseudo-second-order kinetics model and the Freundlich model, respectively. The ultrahigh adsorption capacity of Fe-ZIF-8-500 can be explained by the synergistic effect of multi-affinities, i.e., surface complexation, electrostatic attraction, π-π interaction and hydrogen bonding. After being used for four cycles the adsorption capacity of Fe-ZIF-8-500 remains a high level, demonstrating its outstanding reusability. The ultrahigh adsorption capacity, excellent reusability, satisfactory water stability and easy-preparation nature of Fe-ZIF-8-500 highlight its bright prospect for removing tetracycline pollutant from wastewater. • Fe-ZIF-8 is prepared by doping Fe in the synthesis of the ZIF-8. • The heat treatment provides an efficient tool for improving the TC adsorption performance of the Fe-ZIF-8. • The Fe-ZIF-500 demonstrated satisfactory reusability and regenerability. • The Fe-ZIF-500 exhibited an ultrahigh adsorption capacity which is remarkably higher than the pristine ZIF-8.

High-performance Fe-doped ZIF-8 adsorbent for capturing tetracycline from aqueous solution