摘要
采用液相沉积法制备出了纳米SiO_2-Fe_3O_4复合粒子,并在其表面负载ZnO,得到了易于磁性固液分离的磁载光催化剂ZnO/SiO_2-Fe_3O_4,并通过傅立叶红外光谱仪、X射线衍射仪和透射电子显微镜等对光催化剂进行了表征。以亚甲基蓝为目标降解物,研究了光催化剂在紫外光下的光催化活性。实验结果表明,在Fe_3O_4和ZnO之间包覆一层无定形SiO_2可使亚甲基蓝降解率由20.34%提高到94.52%,所制备的ZnO/SiO_2-Fe_3O_4在3次重复使用后仍能保持较好的光催化性能。
Nano-particle SiO2-Fe3O4 was prepared by liquid phase deposition method and coated with ZnO to obtain magnetic photocatalyst ZnO/SiO2-Fe3O4, which can be easily separated from liquid in magnetic field. The photocatalyst was characterized by means of FTIR, XRD, TEM and so on, and its photocatalytic activity under UV-light was studied using methylene blue as degradation object. The experimental results show that an amorphous SiO2 film between Fe3O4 and ZnO can significantly increase the degradation rate of methylene blue from 20.34% to 94.52%, and the photocatalytic activity of ZnO/SiO2-Fe3O4 remains high after 3 times of reuse.
出处
《化工环保》
CAS
CSCD
北大核心
2009年第5期475-477,共3页
Environmental Protection of Chemical Industry
关键词
磁载光催化剂
氧化锌
亚甲基蓝
降解
magnetic photocatalyst
zinc oxide
methylene blue
degradation
