Preparation and physicochemical properties of ZrO2 and Fe/ZrO2 prepared by a sol-gel technique
Preparation and physicochemical properties of ZrO2 and Fe/ZrO2 prepared by a sol-gel technique
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DOI：
10.1021/la000897d
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发表时间：
2001-01-09
期刊：
影响因子：
3.9
通讯作者：
Litter, MI
中科院分区：
文献类型：
--
作者：
Navío, JA;Hidalgo, MC;Litter, MI
纯 ZrO2 和 0.5-5 wt% 含铁样品通过溶胶凝胶技术制备，并通过多种技术、X 射线衍射 (XRD)、差热分析 (DTA)、漫反射光谱 (DRS)、扫描和透射电子显微镜（SEM 和 TEM）、X 射线光电子能谱 (XPS) 和其他补充技术进行彻底表征。在氧化锆中引入铁产生了从单斜晶系到四方晶系的相变。与一般报道的氧化锆带隙值 (5 eV) 相比，本样品的值范围在 2.3 至 3.8 eV 之间，由 DRS 确定，具体取决于制备条件和铁含量。还介绍了不同物质（亚硝酸盐、乙二胺四乙酸 (EDTA) 和 Cr(VI)）吸附的初步实验，并通过与特征氧化物的物理化学性质的相关性解释了结果。氧光吸附和氧同位素交换（OIE）结果可以与最近发现的光催化活性相关，表明该技术在表征光催化剂以解释其光活性方面的潜力。
Pure ZrO2 and 0.5-5 wt % iron-containing samples have been prepared by a sol-gel technique and thoroughly characterized by several techniques, X-ray diffraction (XRD), differential thermal analyses (DTA), diffuse reflectance spectroscopy (DRS), scanning and transmission electron microscopies (SEM and TEM), X-ray photoelectron spectroscopy (XPS), and other complementary techniques. Introduction of iron in zirconia produced a phase transition from monoclinic to tetragonal. In contrast to generally reported values of zirconia band gap (5 eV), the values of the present samples ranged between 2.3 and 3.8 eV, determined from DRS,depending on the preparation conditions and on the iron content. Preliminary experiments of adsorption of different species (nitrite, ethylenediaminetetraacetic acid (EDTA), and Cr(VI)) are also presented and the results explained by a correlation with the physicochemical properties of the characterized oxides. Oxygen photoadsorption and oxygen isotopic exchange (OIE) results can be corelated to the photocatalytic activity recently found, showing the potentiality of this technique for the characterization of photocatalysts in order to account for its photoactivity.