Efficiency and Mechanism of Ciprofloxacin Hydrochloride Degradation in Wastewater by Fe₃o₄/Na₂S₂O₈

ABSTRACT

The nanosized Fe₃O₄ catalyst was synthesized via a modified reverse coprecipitation method and characterized by means of a scanning electron microscope (SEM) and an X-ray diffraction (XRD) analysis instrument. The degradation efficiency and reaction rate of Fe₃O₄ in activating sodium persulfate used to degrade ciprofloxacin were determined from the catalyst dosage, oxidant concentration, and initial pH. The results showed that under the optimum conditions of a catalyst dosage of 2.0 g·L⁻¹, a sodium persulfate concentration of 1.0 g·L⁻¹, and an initial pH of 7, the degradation rate of ciprofloxacin was 93.73%, the removal rate of total organic carbon was 78%, and the first-order reaction constant was 0.06907 min⁻¹ within 40 min. It was also demonstrated that the reactive oxygen species in the Fe₃O₄/sodium persulfate catalytic system were mainly composed of SO₄^– and supplemented by OH· and HO₂· using probe compounds such as ethanol, tertiary butanol, and benzoquinone.

KEYWORDS:

• Catalytic Oxidation
• Ciprofloxacin Hydrochloride
• Fe₃o₄
• Sodium Persulfate

Additional information

Funding

This work was financially supported by Public Technology Applied Research Fund of Zhejiang Province Science and Technology Department (LGF18E080005), and The Science & technology project of Taizhou city (162gy46).