CCl4强化超声降解诺氟沙星的效果和抗菌性分析

Degradation and antibacterial activity analysis of norfloxacin under CCl_4-enhanced ultrasound irradiation process

研究CCl4对超声降解诺氟沙星的强化效果和抗菌性的去除,考察了CCl4质量浓度、超声功率、溶液初始p H值、诺氟沙星初始浓度、Na Cl等对降解效果的影响.并采用滤纸片法考察了诺氟沙星降解过程中抗菌性的变化.结果表明,CCl4增强了超声降解诺氟沙星的效果,降解过程符合一级反应动力学.在反应液体积为250 m L,CCl4质量浓度在0.00—2.55 g·L-1范围,诺氟沙星的去除率随CCl4质量浓度的增加而增加,超声40 min,去除率由6.9%增加到67.37%.超声功率在130—325 W范围,260 W时的去除率达到最高;p H值对诺氟沙星的超声降解影响很大,p H值为6.60时一级反应速率常数k达到最大,为27.19×10-3min-1.CCl4质量浓度一定,诺氟沙星的去除率随其初始浓度的增加而降低.Na Cl降低了诺氟沙星的降解效果,Na Cl浓度在0—8.0 mg·L-1,反应40 min,诺氟沙星的去除率从67.37%降低为47.43%.大肠杆菌和金黄色葡萄球菌的抗菌结果表明,超声/CCl4能够完全去除诺氟沙星的抗菌性.反应30 min,大肠杆菌的抑菌圈直径从30.0 mm减小到14.0 mm(滤纸直径为14.0 mm).反应40 min,金黄色葡萄球菌的抑菌圈直径从28.0 mm减小到14.0 mm.本研究表明超声/CCl4能有效用于含氟喹诺酮类抗生素的废水处理.

Enhanced degradation and antibacterial activity of norfloxacin under ultrasonic/CCl4 system was studied. The experimental parameters such as CCl4 mass concentration, ultrasonic power, pH value, norfloxacin initial concentration and sodium chloride on norfloxacin degradation efficiency were evaluated. And norfloxacin antibacterial activity was evaluated by agar diffusion test. The results indicated that norfloxacin ultrasonic degradation was significantly enhanced under ultrasonic/CCl4 system, and the degradation process followed the first-order kinetics. In a solution volume of 250 mL, CCl4 mass concentration between 0.00 and 2.55 g·L^-1, norfloxacin degradation efficiency increased with CCl4 concentration, and charged from 6.9% to 67.37% in 40 min. The efficiency was the highest at an ultrasonic power of 260 W. The pH value had a significant effect on norfloxacin removal. The first-order rate constant k reached 27. 19 × min^-1 at pH 6. 60. Norfloxacin initial concentration had a negative effect on its removal. The introduction of sodium chloride inhibited norfloxacin removal, norfloxacin removal efficiency decreased from 67.37% to 47-43% when sodium chloride concentration increased from 0 to 8. 0 mg·L^-1 . From agar diffusion test with E. coli and S. aureus, it was observed that Ultrasonic/CCl4 completely removed norfloxacin antibacterial activity, with the inhibition zone diameter decreased from 30 mm to 14 mm for E.coli in 30 min, and from 28 mm to 14 mm for S. aureus in 40 min. The study showed that ultrasonic/CCl4 can be effectively used for treatment of wastewater containing fluoroquinolone antibiotics.