超声在TiO_2基光催化剂的制备和降解废水中的应用

Application of ultrasonic technique in preparation and wastewater photocatalytic degradation of TiO_2

TiO2多相光催化氧化是近20多年来迅速发展并且广泛研究应用的水处理技术。但是,TiO2较宽的禁带宽度和较低的量子效率是限制其实际应用的主要原因。利用超声能够有效改善TiO2制备方法和提高光催化过程中的量子效率,因而,超声联合光催化技术正逐步成为一个研究热点。综述了超声在制备纯TiO2、TiO2复合物及TiO2掺杂改性中的应用进展,超声协同光催化的基本原理以及超声联合TiO2光催化技术在废水处理中的应用。

TiO2 heterogeneous photocatalytic oxidation has been successfully used in wastewater treatment and continues to be an active field of application and research since 1980＇s.However,the broad band gap and low quantum efficiency limit its extensive use in environment purification.At present,research on modification of preparation methods and improving the photocatalytic efficiency by ultrasound technology（US） are becoming hot-pots in this field.The application of ultrasonic cavitation in the progress of TiO2 preparation,including puring TiO2,Composite,and the doping were introduced.The mechanism and the current status of the ultrasonic assisted photocatalysis used in wastewater treatment were also reviewed.