摘要
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>400nm).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.
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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第6期1205-1210,共6页
Chemical Journal of Chinese Universities
基金
上海市重点学科建设项目(批准号:B604)资助
关键词
磁分离
光催化
二氧化钛
可见光
Magnetical separation
Photocatalysis
TiO2
Visible light
