Preparation of Fe/Ni-MOFs for the Adsorption of Ciprofloxacin from Wastewater

Abstract

This work studies the use of Fe/Ni-MOFs for the removal of ciprofloxacin (CIP) in wastewater. Fe/Ni-MOFs are prepared by the solvothermal method and characterized by X-ray diffraction (XRD), a scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), and a thermal gravimetric analyzer (TG). Under the conditions of the concentration of 50 ppm, a mass of 30 mg, and a temperature of 30 °C, the maximum adsorption capacity of ciprofloxacin removal within 5 h was 232.1 mg/g. The maximum removal rate was 94.8% when 40 mg of the Fe/Ni-MOFs was added to the solution of 10 ppm ciprofloxacin. According to the pseudo-second-order (PSO) kinetic model, the R2 values were all greater than 0.99, which proved that the adsorption theory of ciprofloxacin by Fe/Ni-MOFs was consistent with the practice. The adsorption results were mainly affected by solution pH and static electricity, as well as other factors. The Freundlich isotherm model characterized the adsorption of ciprofloxacin by Fe/Ni-MOFs as multilayer adsorption. The above results indicated that Fe/Ni-MOFs were effective in the practical application of ciprofloxacin removal.

Preparation of bimetallic metal–organic frameworks for adsorbing doxycycline hydrochloride from wastewater

“…As such, MOFs are promising alternative material candidates. They are widely used for catalysis, 26,27 carbon dioxide capture, 28 antibiotics, 29,30 energy storage, 31 adsorption and separation, 32–34 drug delivery, 35 wastewater treatment, 36–40 and other functions 41–44 due to their diversified structure, higher surface area, tunable functional groups, and permanent pores. Previous studies have shown that most MOFs use a single metal ion, which is limited in the treatment of pollutants, with often poor treatment effects.…”