摘要
采用Zr O2-Ti O2复合催化剂对水中氧氟沙星进行了光催化降解,应用响应面方法优化了降解过程中的主要影响因素,并考察了不同自由基抑制剂和实际水体对催化效果的影响。结果表明,Ti O2负载了Zr O2后能够显著提升对水中氧氟沙星的光催化降解效能,降解过程符合拟1级反应动力学规律;光催化反应的优化反应条件为:p H为6.43,催化剂投加量为0.63 g/L,氧氟沙星初始质量浓度为5.00 mg/L;氧氟沙星的光催化降解过程中,光生空穴的直接氧化作用占据了主导地位;Zr O2-Ti O2复合催化剂在水厂常规工艺处理水中对氧氟沙星20 min的降解率可以达到约70%。
The photocatalytic degradation of ofloxacin has been performed in aqueous suspension with synthesized ZrO2-TiO2 as composite catalyst. The main factors of degradation were optimized by response surface methodology. The effect ofphotocatalytic degradation was investigated under different radical scavengers and water matrix. Results indicated that the effect of TiO2 can be significantly improved by loading ZrO2, and the ofloxacin degradation process accord with first-order kinetics. The optimum pH, synthetized catalyst loading and initial ofloxacin mass concentrations were 6.43, 0.63 g/L and 5 rag/L, respectively. It was determined that ofloxacin degradation occurred principally by direct hole oxidation. After 20 min, about 70% of ofloxacin was degraded by conventional process with synthetized catalyst ZrO2-TiO2.
出处
《水处理技术》
CAS
CSCD
北大核心
2015年第9期78-82,共5页
Technology of Water Treatment
基金
国家水体污染控制与治理科技重大专项(2014ZX07405002)
