The degradation is the biggest when pH = 4. 5 by using both ultrasonic and TiO2/SiO2/Fe3O4 magnetic nana TiO2/SiO2/Fe3O4 has not only excellent catalytic activity but also good magnetic property that can make the callback easy.

• 酸性条件下采用超声/纳米 TiO2/SiO2/Fe3O4协同降解效果较好；pH=4.；2时最佳。 磁性纳米TiO2/SiO2/Fe3O4不仅具有高效催化活性；而且容易回收利用。