ZnS/镍锌铁氧体磁性光催化剂的制备与光催化活性

Preparation and Photocatalytic Activity of ZnS/Nickel-Zinc Ferrite Magnetic Photocatalyst

采用共沉淀法制备了镍锌铁氧体,并用氨水、乙二胺四乙酸进行表面改性;然后以醋酸锌、硫代乙酰胺和表面改性的镍锌铁氧体为原料,采用超声化学法制备了ZnS/镍锌铁氧体的复合粉体。采用X射线粉末衍射(XRD),高分辨透射电子显微镜(HRTEM)以及所带能谱仪(EDS)对所制得的样品进行了表征,并以太阳光为光源,甲基橙为目标降解物,对其光催化活性进行了研究。结果表明:镍锌铁氧体负载的ZnS为立方闪锌矿结构,单个ZnS颗粒尺寸分布在15～25 nm之间;ZnS/镍锌铁氧体复合粉体在可见光下具有一定的光催化活性,且具有磁性能可实现磁分离回收。

Nickel-zinc ferrite powders prepared by coprecipitation method were modified by NH3·H2O and EDTA,respectively.Then ZnS/nickel-zinc ferrite composite powders were prepared by the sonochemical method using zinc acetate,thioacetamide and modified nickel-zinc ferrite as raw materials.The as-prepared sample was characterized by X-ray diffraction（XRD）,high resolution transmission electron microscopy（HRTEM） and energy dispersive spectroscopy（EDS）.The photocatalytic activity of the sample was evaluated by degradation of methyl orange under sunlight.The results show that the ZnS coating nickel-zinc ferrite is cubic sphalerite structure and a single ZnS particle size is between 15-25 nm.ZnS/nickel-zinc ferrite powders have photocatalytic activity under the irradiation of visible light,the ZnS/nickel-zinc ferrite powders still have magnetic property,and can be separated from the system by applying magnetic field.