Magnetic nano-biocomposite CuFe2O4@methylcellulose (MC)
prepared as a new nano-photocatalyst for degradation of
ciprofloxacin from aqueous solution
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Abstract
Background: Antibiotics such as ciprofloxacin (CIP) are even more important in bacterial resistance,
even at low concentrations. The aim of this research was to synthesize CuFe2O4@methylcellulose (MC)
as a new nano-photocatalyst for degradation of CIP from aqueous solution.
Methods: The nano-photocatalyst (CuFe2O4@MC) was characterized by FESEM, energy dispersive
spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR), thermogravimetric
analysis (TGA), and vibrating sample magnetometer (VSM). Powder XRD and EDS analysis confirmed
the formation of pure-phase spinel ferrites. After CuFe2O4@MC characterization, the effective
parameters in removal efficiency of CIP such as reaction time, initial antibiotic concentration, pH,
photocatalyst loading, and degradation kinetic were investigated and conditions were optimized. Then,
CIP degradation experiments were conducted on the real sample in the optimal conditions. The removal
of chemical oxygen demand (COD) was determined under optimum conditions.
Results: The structural characterization of the magnetic nanobiocomposite showed that it is in
nanoscale, ferromagnetic property, and thermal stability. The optimal conditions were obtained at pH =
7, irradiation time (90 minutes), photocatalyst loading (0.2 g), and initial concentration of CIP (3 mg/L).
The removal efficiency of CIP in the optimal conditions was obtained as 80.74% and 72.87% from the
synthetic and real samples, respectively. The removal of COD was obtained as 68.26% in this process.
The evaluation of kinetic linear models showed that the photocatalytic degradation process was fitted by
pseudo-first order kinetic model and Langmuir-Hinshelwood. CuFe2O4@MC photocatalyst had a good
stability and reusability for the fourth runs.
Conclusion: The photocatalytic degradation of CIP from aqueous media with CuFe2O4@MC
photocatalyst has a high efficiency, which can be used in the treatment of pharmaceutical wastewaters.
Keywords: Spinel, Ciprofloxacin, Methylcellulose, Wastewate