Floatable cellulose acetate beads embedded with flower-like zwitterionic binary MOF/PDA for efficient removal of tetracycline

Removal of pharmaceutical wastes, especially antibiotics from aquatic systems is an imperative issue from both human-health and ecological perspectives. Herein, zwitterionic UiO-66/ZIF-8 binary MOF/ polydopamine@cellulose acetate composite (UiO-66/ZIF-8/PDA@CA) were fabricated in the form of floated beads for the adsorptive removal of tetracycline (TC). The formulated composite beads were char-acterized by FTIR, XRD, SEM, BET, Zeta potential and XPS analysis tools. Under optimum adsorption con-ditions, the UiO-66/ZIF-8/PDA@CA composite beads demonstrated large specific surface area, good adsorption performance with a relatively short equilibrium time (60 min) and ease separation. Furthermore, the adsorption data fit Temkin > Langmuir > Freundlich with a maximal adsorption capacity of 290.69 mg/g at 25 degrees C, while the adsorption kinetics were well-described by pseudo-second order kinet-ics. The thermodynamics studies refereed that the adsorption process was endothermic and spontaneous. Besides, the floated UiO-66/ZIF-8/PDA@CA beads displayed better adsorption property for eight reuse cycles with a maximal removal (%) reached 67%, reflecting its promising applicability as reusable adsor-bent for efficient removal of antibiotics from water bodies.(c) 2022 Elsevier Inc. All rights reserved.

Automated summary

In this study, a floated bead composite was fabricated for the efficient removal of tetracycline from water bodies. The composite beads exhibited a large specific surface area, good adsorption performance with a relatively short equilibrium time, and easy separation. Moreover, the composite beads showed promising applicability as a reusable adsorbent for the efficient removal of antibiotics.