Formation of new crystal faces on TiO2 particles by treatment with aqueous HF solution or hot sulfuric acid
Formation of new crystal faces on TiO2 particles by treatment with aqueous HF solution or hot sulfuric acid
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DOI：
10.1039/b304518h
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发表时间：
2003-09
影响因子：
3.3
通讯作者：
Taketo Taguchi;Y. Saito;Koji Sarukawa;T. Ohno;M. Matsumura
中科院分区：
文献类型：
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作者：
Taketo Taguchi;Y. Saito;Koji Sarukawa;T. Ohno;M. Matsumura
我们已经证明，通过在含水氢氟酸或热硫酸中进行化学蚀刻，在锐钛型和金红石型TiO 2颗粒上产生了新的晶面。在用氢氟酸水溶液处理时，新形成了金红石颗粒的{112}面和金红石颗粒的{021}面。当用热硫酸处理时，金红石颗粒暴露{122}面，金红石颗粒暴露{001}、{010}、{021}和{121}面。在这两种情况下，金红石颗粒的蚀刻速率都高于金红石颗粒。预期蚀刻的颗粒显示晶面特有的光催化性质。例如，在Pb 2+离子的氧化中，证实了纳米颗粒的{112}面是活性的。
We have demonstrated that new crystal faces are generated on anatase and rutile TiO2 particles by means of chemical etching in aqueous hydrofluoric acid or hot sulfuric acid. In the treatment with aqueous hydrofluoric acid, the {112} face of anatase particles and the {021} face of rutile particles are newly formed. When treated with hot sulfuric acid, anatase particles exposed the {122} face and rutile particles exposed the {001}, {010}, {021} and {121} faces. In both cases, anatase particles are etched at a higher rate than rutile particles. The etched particles are expected to show photocatalytic properties unique to the crystal faces. For example, the {112} face of anatase particles is demonstrated to be active in the oxidation of Pb2+ ions.