摘要
Due to the increasingly severe water contamination of antibiotics, high-efficient and green removal of antibiotics from aqueous solution is of great significance to environmental remediation and human health. The combined degradation of tetracycline hydrochloride (TCH) in water by pulsed discharge plasma on water surface (WSPDP) coupled with CaFe 2 O 4 /Bi 2 O 3 composite was investigated. The basic properties of the prepared CaFe 2 O 4 /Bi 2 O 3 composite were analyzed by XRD , SEM, TEM, PL and XPS, which indicated that the CaFe 2 O 4 /Bi 2 O 3 sample was synthesized successfully. Degradation performance revealed that there existed a synergistic effect in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system, and WSPDP could induce catalysis of CaFe 2 O 4 /Bi 2 O 3 composite. After adding 0.4 g/L 7 wt% CaFe 2 O 4 /Bi 2 O 3 sample to the WSPDP system, the degradation efficiency of TCH improved from 82.9% to 93.8%, and the kinetic constant enhanced from 0.0616 min −1 to 0.0953 min −1 after 30 min of discharge treatment. Furthermore, the effects of pulse peak voltage, pulse frequency, initial pH of solution and air flow rate on TCH degradation were evaluated. The highest TCH degradation efficiency of 97.8% could be obtained at the peak pulse voltage of 24.6 kV, pulse frequency of 50 Hz, initial pH of 3 and air flow rate of 2 L/min within 30 min. OH, h + and O 2 − were the main reactive radicals for TCH degradation in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system·H 2 O 2 and O 3 were also involved in TCH degradation of the synergistic system, and the addition of CaFe 2 O 4 /Bi 2 O 3 could significantly improve the utilization of H 2 O 2 and O 3 in the solution. The intermediates of TCH degradation were identified by liquid chromatography-mass spectrometry (LC-MS). Finally, the possible degradation pathways and synergistic degradation mechanism of TCH in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system were proposed.
危险品化学品经营许可证（带存储）