【摘要】 通过水热法制备铁酸铋催化剂,采用XRD、SEM等方法对样品进行表征,并以类芬顿体系和光芬顿体系分别降解诺氟沙星,考察相关反应参数对诺氟沙星降解效果的影响。试验结果表明,类芬顿体系降解诺氟沙星过程符合伪一级反应动力学模型,在诺氟沙星初始浓度为10mg/L、pH值为3、H₂O₂投加量为1 mmol/L、铁酸铋催化剂投加量为1. 0 g/L、反应时间为2 h条件下,体系对诺氟沙星的降解率达到100%,表观速率常数K_app为0. 018 7 min^-1。比较铁酸铋催化类芬顿及光芬顿体系分别降解诺氟沙星的效果,发现光照对类芬顿体系降解诺氟沙星具有显著的促进作用,且能够扩宽体系pH值的适用范围。重复使用性试验和相关检测结果表明,制备的铁酸铋催化剂性质稳定,无金属离子溶出,具有较好的重复使用性。更多还原

【Abstract】 BiFeO₃ was prepared through hydrothermal method,and its sample was characterized by XRD and SEM. BiFeO₃/Fenton-like and BiFeO₃/photo-Fenton systems were used to degrade norfloxacin,and the effect of reaction conditions on the degradation of norfloxacin was investigated. The results indicated that the degradation of norfloxacin followed the pseudo-first order reaction kinetics model. The degradation rate of norfloxacin was 100% and the apparent rate constant Kappwas 0. 018 7 min^-1 with norfloxacin initial concentration of 10 mg/L,H₂O₂ dosage of 1 mmol/L,p H value of 3,BiFeO₃ dosage of 1. 0 g/L and reaction time of 2 hours. It was found that the addition of light could significantly improve the degradation of norfloxacin and widened the applicable range of pH value of the system after comparing the norfloxacin degradation effect by BiFeO₃/Fenton-like and BiFeO₃/photoFenton systems. The reusability test and related test results showed that the BiFeO₃ catalyst had stable properties with good reusability,and there was no metal ion dissolution.更多还原