Characterization of iron-doped titania sol-gel materials
Characterization of iron-doped titania sol-gel materials
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DOI：
10.1039/b105724n
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发表时间：
2002-01-01
影响因子：
--
通讯作者：
Reyes, P
中科院分区：
文献类型：
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作者：
López, TL;Moreno, JA;Reyes, P
Fe/TiO 2材料在1重量%的Fe含量已通过使用盐酸（pH 3）作为水解催化剂添加FeCl 2的水溶液到正四丁氧基钛制备。将所得凝胶在200、400、600和800 ℃下热处理。采用FTIR、UV-Vis、穆斯堡尔谱和X射线粉末衍射对材料进行了表征。煅烧样品的FTIR光谱显示存在高度羟基化的TiO 2。XRD图谱显示，在高达600 ℃处理的样品中，板钛矿、金红石和金红石TiO 2相共存。在800 ℃处理的样品中，金红石是观察到的唯一相。UV-Vis光谱表明，样品的带隙E-g随热处理温度的升高而增大。穆斯堡尔谱分析表明，高温处理后的TiO 2样品中Fe ~（2+）和Fe ~（3+）共存。
Fe/TiO2 materials at 1 wt% Fe content have been prepared by the addition of aqueous solutions of FeCl2 to titanium n-tetrabutoxide using hydrochloric acid (pH 3) as a hydrolysis catalyst. The obtained gel was thermally treated at 200, 400, 600 and 800 degreesC. Characterization of the materials was performed by FTIR, UV-Vis, Mossbauer and X-ray powder diffraction. FTIR spectra of the calcined samples showed the presence of highly hydroxylated TiO2. The XRD patterns show the coexistance of brookite, anatase and rutile TiO2 phases in samples treated up to 600 degreesC. In the sample treated at 800 degreesC rutile was the only phase observed. UV-Vis spectroscopy revealed that the band gap E-g of the samples increased with increased thermal treatment temperature. Mossbauer spectroscopy showed the coexistance of Fe2+ and Fe3+ on the TiO2 samples treated at high temperatures.