Adsorption of ciprofloxacin in water using Fe3O4 nanoparticles formed at low temperature and high reactant concentrations in a rotating packed bed with co-precipitation

Publication date: 15 January 2020Source: Materials Chemistry and Physics, Volume 240Author(s): Chia-Chang Lin, Cheng-Yen LeeAbstractA rotating packed bed was used to form Fe3O4 nanoparticles at 25 °C with a rotational speed of 1800 rpm, flow rates of 0.5 L/min, and FeCl2, FeCl3, and NaOH concentrations of 0.15 mol/L, 0.3 mol/L, and 1.2 mol/L, respectively. The as-formed Fe3O4 nanoparticles had an average diameter of 9 nm, a BET specific surface area of 140 m2/g, and a saturation magnetization of 68 emu/g. The effectiveness of the as-formed Fe3O4 nanoparticles in adsorbing ciprofloxacin in water was evaluated. Increasing the Fe3O4 dosage from 1 to 2.5 g/L reduced the equilibrium adsorption capacity of the as-formed Fe3O4 nanoparticles but increased the efficiency of removal of ciprofloxacin. The equilibrium adsorption capacity of the as-formed Fe3O4 nanoparticles increased with the initial concentration of ciprofloxacin at all pH values. The equilibrium adsorption capacity of the as-formed Fe3O4 nanoparticles was highest at pH 7 with low initial concentrations of ciprofloxacin (10–30 mg/L). However, with high initial concentrations of ciprofloxacin (40–100 mg/L), the equilibrium adsorption capacity of the as-formed Fe3O4 nanoparticles was highest at pH 8. The adsorption of ciprofloxacin onto the as-formed Fe3O4 nanoparticles was more consistent with the Freundlich model than with the Langmuir model at all pH values. At pH 8, an initial concentration ...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research