Photocatalysis coupled with adsorption of [email protected] in peroxydisulfate assisted system efficiently enhance ciprofloxacin removal

Abstract

Nickle-copper ferrite (Ni0.5Cu0.5Fe2O4) supported on activated carbon (AC) ([email protected]) was synthesized and used as adsorbent, photocatalyst, and activator of peroxydisulfate (PDS) to realize the removal of ciprofloxacin (CIP). [email protected] properties were characterized by scanning electron microscope equipped with energy-dispersive X-ray (SEM-EDX), X-ray diffraction (XRD), N2 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 [email protected]/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 (·O2−), holes (h+), sulfate radicals (SO4−·) and hydroxyl radicals (·OH) were produced and all worked. The reusability test demonstrated that [email protected] could be recycled five times with minimal performance reduction for the removal of CIP. The XRD and SEM of the after used [email protected] did not change significantly, which further showed its stability and recyclability. This work might provide new insight into the application of [email protected] in photocatalysis coupled with adsorption in peroxydisulfate assisted system and has high potential in CIP removal. HIGHLIGHTS [email protected] was synthesized by a simple co-precipitation method.; [email protected] has a large specific surface area and thus can provide more reaction sites.; [email protected] can be used as adsorbent, photocatalyst, and activator of peroxydisulfate.; [email protected] displayed an excellent recyclability.;

Keywords

• [email protected]
• adsorption
• ciprofloxacin
• peroxydisulfate
• photocatalysis