可磁分离的氮掺杂二氧化钛光催化剂的制备及光催化性能

将氮掺杂二氧化钛和通过液相催化相转化制备的磁性载体混合、煅烧制备了一种可磁分离的光催化剂TiO2-xNx/SiO2/NiFe2O4(TSN), 这种光催化剂显示出了典型的铁磁性和可见光活性(λ>400 nm). 对该光催化剂的XRD谱图和透射电镜照片进行分析. 结果表明, SiO2/NiFe2O4(SN)纳米粒子黏附在TiO2-xNx聚集体的表面形成了TSN复合光催化剂. 利用光催化降解甲基橙的效果来评价这种光催化剂的活性. 结果表明, 在NiFe2O4和TiO2-xNx之间包覆一层无定形的SiO2, 可以显著地提高催化剂的脱色效果.

Preparation and Photocatalytic Properties of Magnetically Separated Nitrogen-doped TiO2

A magnetically separated nitrogen-doped photocatalyst TiO2-xNx/SiO2/NiFe2O4(TSN) with a typical ferromagnetic hysteresis was prepared by a simple process: the magnetic SiO2/NiFe2O4(SN) dispersion and the visible-light-active photocatalyst TiO2-xNx were mixed, sonificated, dried, and calcined. The catalyst shows a photocatalytic activity for the degradation of methyl orange in water under visible light irradiation(λ>400 nm). X-ray diffractometer(XRD) and transmission electron microscope(TEM) were used to characterize the structure of photocatalyst TSN. The results indicate that the magnetic SN nanoparticles adhered to the surface of TiO2-xNx congeries. The degradation experiments of methyl orange indicate that the thin SiO2 layer between NiFe2O4 and TiO2-xNx could improve the photocatalytic activity of TSN.