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TiO2/SiO2/γ-Fe2O3-SiO2磁性光催化剂的制备与表征
作者姓名:王松威  徐盛明  陈崧哲  徐景明
作者单位:清华大学核能与新能源技术研究院,北京,100084;清华大学核能与新能源技术研究院,北京,100084;清华大学核能与新能源技术研究院,北京,100084;清华大学核能与新能源技术研究院,北京,100084
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.

关 键 词:氧化铁  氧化钛  氧化硅  磁性光催化剂  热稳定性  包覆
文章编号:0253-9837(2005)11-0938-03
收稿时间:2005-08-17
修稿时间:2005-08-17
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