为解决传统臭氧(O₃)曝气技术O₃逸散及污染物处理效率不高等问题,以疏水性聚四氟乙烯(PTFE)中空纤维膜材料制成膜接触器,并进行膜接触O₃无气泡传质催化O₃氧化技术研究。以苯酚为污染物,通过对比实验、催化O₃氧化实验、动力学分析、自由基屏蔽实验、紫外-可见吸收光谱分析等对新技术的传质特性、氧化效果和氧化机理进行了研究。结果表明,相较于单独O₃氧化,催化氧化体系对苯酚的去除情况均存在不同程度的提升,其中α-Fe₂O₃表现出较高的O₃催化活性。屏蔽实验通过投加叔丁醇(TBA)和Na₃PO₄来屏蔽自由基和反应位点,COD去除率较正常实验时分别降低了21.05%和11.80%,说明催化剂表面的路易斯酸性位点是催生·OH的主要原因。膜接触O₃无气泡传质与α-Fe₂O₃催化O₃氧化具有良好的协同作用,高效去除苯酚的同时解决了O₃逸散问题。

In order to solve the O₃ escaping and low pollutant treatment efficiency problems of traditional ozone (O₃) aeration technology,a membrane contactor is made of hydrophobic polytetrafluoroethylene (PTFE) hollow fiber membrane material,and the study is performed on membrane contact O₃ bubble-free mass transfer catalytic O₃ oxidation technology.The mass transfer characteristics,oxidation effect and oxidation mechanism of the new technology are studied through contrast experiment,catalytic O₃ oxidation experiment,kinetic analysis,free radical shielding experiment and UV-visible absorption spectrum analysis.Results show that compared with O₃ oxidation alone,catalytic oxidation system delivers an improved removal of phenol to varying degrees,and α-Fe₂O₃ shows higher O₃ catalytic activity.In the shielding experiment,tert-butanol (TBA) and Na₃PO₄ are added to shield free radicals and reaction sites.As a result,COD removal rates are 21.05% and 11.80%,respectively lower than by normal experiment,indicating that Lewis acid sites on the catalyst surface are the main reason for the generation of ·OH.There is good synergistic effect between membrane contact O₃ bubble-free mass transfer and α-Fe₂O₃ catalytic O₃ oxidation,which can efficiently remove phenol and solve the problem of O₃ escaping.

姚福春(1996-),男,硕士生,研究方向为水污染控制与废水资源化,386439071@qq.com;张耀宗(1979-),男,博士,副教授,研究方向为水污染控制与废水资源化,通讯联系人,zyaozong@163.com。