TiO_2/SiO_2/-γFe_2O_3-SiO_2磁性光催化剂的制备与表征  

Preparation and Characterization of TiO_2/SiO_2/γ-Fe_2O_3-SiO_2 Magnetic Photocatalyst

作　　者：王松威[1] 徐盛明[1] 陈崧哲[1] 徐景明[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《催化学报》2005年第11期938-940,共3页

基　　金：国家自然科学基金资助项目(50274045)

摘　　要：A γ-Fe2O3-SiO2 composite was prepared by sol-gel method followed by calcination at 700 ℃ for 30 min starting from tetraethoxysilane and iron nitrate.Upon further coating with SiO2 and TiO2,a TiO2/SiO2/（γ-Fe2O3）-SiO2 magnetic photocatalyst was obtained.XRD results show that Fe in the composite converts to the（γ-Fe2O3） phase up to a processing temperature of 700 ℃,and further increase in temperature results in the formation of the（α-Fe2O3） phase.The TiO2/SiO2/（γ-Fe2O3）-SiO2 samples obtained are monodisperse spherical particles with 200～250 nm diameter,well coated firstly by an amorphous SiO2 layer and then by an anatase TiO2 layer.The TiO2/SiO2/（γ-Fe2O3）-SiO2 particles retain their magnetic property well and show high activity for the photocatalytic degradation of salicylhydroxamic acid.A γ-Fe2O3-SiO2 composite was prepared by sol-gel method followed by calcination at 700℃ for 30 min starting from tetraethoxysilane and iron nitrate. Upon further coating with SiO2 and TiO2, a TiO2/SiO2/ γ-Fe2O3-SiO2 magnetic photocatalyst was obtained. XRD results show that Fe in the composite converts to the γ-Fe2O3 phase up to a processing temperature of 700℃ , and further increase in temperature results in the formation of the α-Fe2O3 phase. The TiO2/SiO2/γ-Fe2O3-SiO2 samples obtained are monodisperse spherical particles with 200-250 nm diameter, well coated firstly by an amorphous SiO2 layer and then by an anatase TiO2 layer. The TiO2/SiO2/γ-Fe2O3-SiO2 particles retain their magnetic property well and show high activity for the photocatalytic degradation of salicylhydroxamic acid.

关 键 词：氧化铁 氧化钛 氧化硅 磁性光催化剂 热稳定性 包覆 

分 类 号：O643.36[理学—物理化学]