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.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
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)
关键词
氧化铁
氧化钛
氧化硅
磁性光催化剂
热稳定性
包覆
maghemite, titania, silica, magnetic photocatalyst, heat resistance, coating
