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	超临界乙醇干燥法制备高热稳定性Fe-TiO_2
	卢晗锋 ; 周瑛 ; 徐柏庆 ; 陈银飞 ; 刘化章 ; LU Han-feng ; ZHOU Ying ; XU Bo-qing ; CHEN Yin-fei ; LIU Hua-zhang
	2010-05-13 ; 2010-05-13
关键词	锐钛矿TiO_2 Fe~(3+)掺杂 热稳定性 光催化 Anatase TiO_2 Fe~(3+) doping Thermal stability Photocatalysis O614
其他题名	The Fe-TiO_2 with High Thermal Stability Prepared by Supercritical Ethanol Drying
中文摘要	以TiCl4和Fe(NO3)3为前体,采用共沉淀法和乙醇超临界干燥技术合成了具有不同Fe3+掺杂量的TiO2,样品织构性质用XRD、TEM、BET、TG和UV-vis等技术表征.研究结果表明,超临界干燥方法可以有效地提高Fe-TiO2样品的热稳定性,样品在500℃焙烧时Fe3+对TiO2的比表面积、晶粒度、晶相等性质影响不大,即使在800℃焙烧还能保持锐钛矿晶型.但Fe3+在掺杂量小于0.5at%时,Fe3+会与TiO2晶格中的Ti4+发生同晶取代,从而使TiO2的锐钛矿晶胞参数和晶胞体积增大,导致晶格应力和表面张力增加;当Fe3+掺杂量大于0.5at%时,Fe3+以氧化物形式在TiO2表面聚集,在800℃热处理中晶粒更易被烧结增大;漫反射UV-vis光谱表征发现,Fe3+掺杂提高了样品对可见光的吸收,随着Fe3+含量和焙烧温度的提高,样品对可见光的吸收也随着增加.但是Fe3+掺杂降低了锐钛矿TiO2在紫外光下降解甲基橙速率,这表明锐钛矿TiO2的光催化活性与样品的晶格缺陷和颗粒尺寸密切相关.; The high thermal stability anatase TiO2 doped with different Fe3+ contents were synthesized by coprecipitation of the aqueous solution of TiCl4 and Fe(NO3)3 followed by drying in supercritical ethanol.The textures and microstructure of the samples were characterized with XRD,BET,TG and TEM.The results show that there are no effects of Fe3+ on the BET,particles sizes and morphology of the samples after calcinations at 500℃.Even treated at 800℃ samples was highly resistant to phase transformation from anatase to rutile.However,Small amount of Fe3+(<0.5at%) in TiO2 will replace Ti4+ in lattice which result in an increase in the lattice strain and the surface tension.The excess Fe3+(>0.5at%) in TiO2 shows little effect on lattice parameters and lattice strain,but they was more easy to form large particles for the iron oxide enriching on surface after the thermal treatment.The Diffuse reflectance UV-Vis spectra(DRS) shows that the onset of the absorption band shifted toward higher wavelength with increasing modification level.When the samples was further treated at 800℃,The doped TiO2 showed enhanced adsorption in the range of 400~670nm.The photoactivity of the samples uner UV light were evaluated by photocatalytic degradation of methyl orange(MO) in aqueous solution.The maximum photodegradation rate was obtained in the undoped anatase TiO2.The lower photocatalytic performance of the Fe-doped samples may be ascribed to the richer bulk lattice defects and the larger particle size.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/31715]
专题	清华大学
推荐引用方式 GB/T 7714	卢晗锋,周瑛,徐柏庆,等. 超临界乙醇干燥法制备高热稳定性Fe-TiO_2[J],2010, 2010.
APA	卢晗锋.,周瑛.,徐柏庆.,陈银飞.,刘化章.,...&LIU Hua-zhang.(2010).超临界乙醇干燥法制备高热稳定性Fe-TiO_2..
MLA	卢晗锋,et al."超临界乙醇干燥法制备高热稳定性Fe-TiO_2".(2010).

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