Adsorption of ciprofloxacin on (Zn-Al) LDHs modified 3D reduced graphene oxide: Response surface methodology, adsorption equilibrium, kinetic and thermodynamic studies

doi:10.1016/j.cjche.2025.01.014

Abstract

Abstract: The indiscriminate use and disposal of ciprofloxacin (CIP) have led to its detection in water globally, which pose a huge risk to public health and water environment. Herein, (Zn-Al) LDHs modified 3D reduced graphene oxide nanocomposite ((Zn-Al) LDHs/3D-rGO) was synthesized through a feasible onepot hydrothermal method for CIP removal. The highly distributed (Zn-Al) LDHs flakes on the surface of 3D-rGO endow the resulted (Zn-Al) LDHs/3D-rGO with an excellent adsorption performance for CIP. The adsorption results showed that the adsorption process could be well interpreted by Temkin isothermal model and the pseudo second-order kinetics model. The maximal adsorption capacity of 20.01 mg·g^-1 for CIP could be achieved under the optimal conditions optimized by response surface methodology (RSM). The inhibitory effect of co-existing ions on CIP adsorption were also discussed. The probable adsorption mechanism might be ascribed to p p interactions, hydrogen bonding, electrostatic, and surface complexation. Regeneration tests showed that the obtained 3D porous material also possessed pronounced recyclability. The obtained (Zn-Al) LDHs/3D-rGO holds a great potential for removal of CIP from actual wastewater.

Key words: (Zn-Al) LDHs, 3D reduced graphene oxide, Adsorbent, Synthesis, Ciprofloxacin, Adsorption

摘要： The indiscriminate use and disposal of ciprofloxacin (CIP) have led to its detection in water globally, which pose a huge risk to public health and water environment. Herein, (Zn-Al) LDHs modified 3D reduced graphene oxide nanocomposite ((Zn-Al) LDHs/3D-rGO) was synthesized through a feasible onepot hydrothermal method for CIP removal. The highly distributed (Zn-Al) LDHs flakes on the surface of 3D-rGO endow the resulted (Zn-Al) LDHs/3D-rGO with an excellent adsorption performance for CIP. The adsorption results showed that the adsorption process could be well interpreted by Temkin isothermal model and the pseudo second-order kinetics model. The maximal adsorption capacity of 20.01 mg·g^-1 for CIP could be achieved under the optimal conditions optimized by response surface methodology (RSM). The inhibitory effect of co-existing ions on CIP adsorption were also discussed. The probable adsorption mechanism might be ascribed to p p interactions, hydrogen bonding, electrostatic, and surface complexation. Regeneration tests showed that the obtained 3D porous material also possessed pronounced recyclability. The obtained (Zn-Al) LDHs/3D-rGO holds a great potential for removal of CIP from actual wastewater.

关键词: (Zn-Al) LDHs, 3D reduced graphene oxide, Adsorbent, Synthesis, Ciprofloxacin, Adsorption

Chong Lu, Xingwei Han, Haojun Zou, Xue Gao, Sijia Wang. Adsorption of ciprofloxacin on (Zn-Al) LDHs modified 3D reduced graphene oxide: Response surface methodology, adsorption equilibrium, kinetic and thermodynamic studies[J]. Chinese Journal of Chemical Engineering, 2025, 83(7): 125-136.

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