TiO2/SiO2/γ-Fe2O3-SiO2磁性光催化剂的制备与表征 |
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作者姓名: | 王松威 徐盛明 陈崧哲 徐景明 |
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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 |
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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.
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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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