Modeling of\nthe Adsorption of Tigecycline from Water\non CoFe<sub>2</sub>O<sub>4</sub>‑Graphene Nanocomposites

A CoFe<sub>2</sub>O<sub>4</sub>(11.04%)-graphene (5.45%)\nnanocomposite\nwas synthesized and characterized by spectroscopic techniques. This\nnanocomposite was used to eliminate tigecycline antibiotics from the\nwater. The adsorbent showed 160.0 mg/g adsorption capacity of tigecycline\nantibiotic at 175 mg/L tigecycline, 0.75 g/L dose, 100 min of contact\ntime, and a temperature of 25 °C. One-, two-, and three-parameter\nmodels were applied, i.e., Henry, Langmuir, Freundlich, D–R,\nTemkin, Flory–Huggins, Halsey, Jovanovich, Redlich–Peterson,\nand Sips models. According to statistical data, Langmuir and Sips\nmodels were the best fitted. The adsorption was spontaneous thermodynamically\nfollowing pseudo-second-order kinetics. The adsorption occurred via\na combination of intraparticle diffusion and external mass transfer\nmechanisms. The supramolecular mechanism showed the adsorption of\nthe tigecycline antibiotic via coordination and π–π\nstacking bonds. The characterization results showed that the average\nnanoparticle size obtained was 91.45 nm. The removal efficiency of\nthe adsorbent reduced up to the fifth cycle and later became constant\nat 50%. Hence, CoFe<sub>2</sub>O<sub>4</sub>-graphene nanocomposites\npropose a highly effective and recyclable solution for water treatment\nthrough adsorption, and hence, this method may be used to remove tigecycline\nantibiotics from water bodies.