Magnetic nickel-copper ferrite (Ni x Cu y Fe 2 O 4 ) nano-catalyst was synthesized by co-precipitation method, and it exhibited excellent ability for activating peroxydisulfate (PDS) in the degradation of ciprofloxacin (CIP). As-prepared Ni 0.5 Cu 0.5 Fe 2 O 4 properties were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope equipped with an energy-dispersive X-ray (SEM-EDX), transmissions electron microscopy (TEM), N 2 adsorption-desorption isotherm plot of Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH), vibrating sample magnetometer (VSM). The maximum degradation efficiency is 80.2% by using 0.500 g/L of Ni 0.5 Cu 0.5 Fe 2 O 4 for activating 5.00 mmol/L of PDS to degrade CIP (20.0 mg/L) at 25 ± 2 °C for 50 min (pH = 6.00). The presence of interfering ions Cl − , NO 3 − , and HCO 3 − inhibited the reaction by producing reactive species with low oxidation potential, inducing the degradation efficiency down to 60.0%, 58.1% and 21.5% respectively. Ni 0.5 Cu 0.5 Fe 2 O 4 displayed great magnetic separation characteristic for the satisfactory magnetization; saturation value is ∼8.6 emu/g. The degradation efficiency of recycled samples has no significant difference after using three times, which is about 60%, indicating that Ni 0.5 Cu 0.5 Fe 2 O 4 is a reusability catalyst in activating PDS for CIP degradation. This work might provide an efficient and promising approach to construct recyclable magnetic materials that can be used for wastewater treatment. Magnetic nano-catalyst was synthesized via co-precipitation. Ni 0.5 Cu 0.5 Fe 2 O 4 displayed excellent ability in activating peroxydisulfate. Ni 0.5 Cu 0.5 Fe 2 O 4 displayed great magnetic separation characteristic. Ni 0.5 Cu 0.5 Fe 2 O 4 is a reusability catalyst in activating PDS for CIP degradation.
Nickle-copper ferrite (Ni 0.5 Cu 0.5 Fe 2 O 4 ) supported on activated carbon (AC) (AC@Ni 0.5 Cu 0.5 Fe 2 O 4 ) was synthesized and used as adsorbent, photocatalyst, and activator of peroxydisulfate (PDS) to realize the removal of ciprofloxacin (CIP). AC@Ni 0.5 Cu 0.5 Fe 2 O 4 properties were characterized by scanning electron microscope equipped with energy-dispersive X-ray (SEM-EDX), X-ray diffraction (XRD), N 2 adsorption-desorption isotherm plot of Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH), vibrating sample magnetometer (VSM). A rapid removal rate (94.30%) of CIP was achieved on AC@Ni 0.5 Cu 0.5 Fe 2 O 4 /PDS/UV system with the condition of catalyst dosage 0.30 g/L, initial pH 7.3, PDS addition 0.20 mM, CIP concentration 10 mg/L (200 mL), UV 28 W, in 30 min. Free radical quenching experiments indicate that reactive species of superoxide (·O 2 − ), holes (h + ), sulfate radicals (SO 4 − ·) and hydroxyl radicals (·OH) were produced and all worked. The reusability test demonstrated that AC@Ni 0.5 Cu 0.5 Fe 2 O 4 could be recycled five times with minimal performance reduction for the removal of CIP. The XRD and SEM of the after used AC@Ni 0.5 Cu 0.5 Fe 2 O 4 did not change significantly, which further showed its stability and recyclability. This work might provide new insight into the application of AC@Ni 0.5 Cu 0.5 Fe 2 O 4 in photocatalysis coupled with adsorption in peroxydisulfate assisted system and has high potential in CIP removal. AC@Ni 0.5 Cu 0.5 Fe 2 O 4 was synthesized by a simple co-precipitation method. AC@Ni 0.5 Cu 0.5 Fe 2 O 4 has a large specific surface area and thus can provide more reaction sites. AC@Ni 0.5 Cu 0.5 Fe 2 O 4 can be used as adsorbent, photocatalyst, and activator of peroxydisulfate. AC@Ni 0.5 Cu 0.5 Fe 2 O 4 displayed an excellent recyclability.
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