摘要
In the study, CuS/Fe 2 O 3 /Mn 2 O 3 magnetic nanocomposite was successfully synthesized and the properties were investigated via a series of characterization. Subsequently, the magnetic nanocomposite was applied to activate peroxymonosulfate (PMS) for ciprofloxacin (CIP) degradation. The results showed that the CuS/Fe 2 O 3 /Mn 2 O 3 magnetic nanocomposite possessed higher catalytic performance for ciprofloxacin degradation than bare CuS and Fe 2 O 3 /Mn 2 O 3 composite. The degradation process of CIP was suitable for the pseudo-first-order kinetic model and the highest rate was reached 0.10083 min −1 . And under the optimized conditions (catalyst = 0.6 g·L −1 , PMS = 0.6 g·L −1 , pH = 5.84, C 0 = 0.2 g·L −1 and t = 120 min), the efficiency of 88% and 48.6% were corresponding to degradation and mineralization of ciprofloxacin, respectively. In addition, the key factors of degradation process such as catalyst dosage, PMS concentration, initial pH value and common anions were investigated. And the results indicated that the degradation efficiency of ciprofloxacin was reduced, which affected by the common anions in order of Cl − > SO 4 2− > NO 3 − > HCO 3 − > Humic acid. Besides, several intermediates of ciprofloxacin were detected and the plausible degradation pathways were proposed. In addition, the underlying reaction mechanism was proposed. Meanwhile, the results of free radical quenching experiment and electron paramagnetic resonance (EPR) spectra indicated that both OH and SO 4 − radicals were existed in the reaction system and the OH radicals had a conquer role in the degradation progress. Moreover, the stability and reusability of CuS/Fe 2 O 3 /Mn 2 O 3 magnetic nanocomposite were evaluated, which the degradation efficiency still reached 72% after five times used. Ultimately, the as-constructed CuS/Fe 2 O 3 /Mn 2 O 3 magnetic nanocomposite might be a candidate to the removal of refractory pollutants in environmental remediation.
危险品化学品经营许可证（带存储）