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Improvement of photocatalytic activity of titania prepared by new methods

新方法制备二氧化钛光催化活性的提高

基本信息

批准号：
10450289
负责人：
WAKABAYASHI Katsuhiro
金额：
$ 0.96万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

In this study, we prepared TiOィイD22ィエD2 catalysts for the photo-decomposition of organic compounds. Titania ( TiOィイD22ィエD2) particles were prepared by hydrolysis of titanium alkoxide, titanium tetra-n-butoxide (TTB), in water-in-oil microemulsion. Crystal size of TiOィイD22ィエD2 thus obtained was 8.5 nm and much smaller than that of commercial TiOィイD22ィエD2, P-25. The surface area of TiOィイD22ィエD2 was larger than that of commercial TiOィイD22ィエD2 (P-25) because of the small crystal size. In photo-decomposition of acetic acid, the catalytic activity of the TiOィイD22ィエD2 prepared by this method was higher than that of P-25. The high activity was attributed to the high surface area.Moreover, to enhance the catalytic activity for the photo-decomposition of organic compounds at a low concentration in waste water, active carbon (AC)-supported TiOィイD22ィエD2 catalysts were prepared. TTB and phenolic resin were used as a precursor of TiOィイD22ィエD2 and active carbon, respectively. Colloidal TiOィイD22ィエD2 particles were synthesized by hydrolysis of TTB in a methanol solution of phenolic resin. The phenolic resin containing TiOィイD22ィエD2 particles was carbonized in NィイD22ィエD2 in the temperature range from 400℃ to 800℃. Anatase titania with a crystal size of approximately 7.0 nm was obtained. Photo-decomposition of acetic acid was carried out as a model reaction. Air-activation was conducted to increase the surface area of carbon support, because the increase in the surface area led to the enhancement of the absorbing ability of TiOィイD22ィエD2 catalyst for acetic acid. The photocatalytic activity was increased with the increasing surface area.

在本研究中，我们制备了用于有机化合物光分解的TiO-ィイD22-ィエ-D2催化剂。在油包水型微乳液中，以四正丁氧基钛为原料，通过水解法制备了纳米二氧化钛(TiO2D22ィイD2ィエD2)。所得ィイD22ィエD2的晶粒度为8.5 nm，大大小于市售的ィイD22ィエD2，P-25的晶粒度。TiO2D22ィイD2的比表面积比市售的TiOD22D22ィエD2(P-25)要大，这是因为其晶型较小。该方法制备的ィイD22ィエD2催化剂对醋酸的光催化活性高于P-25催化剂。此外，为了提高对废水中低浓度有机化合物光分解的催化活性，制备了活性碳(AC)负载的ィイD22ィエD2催化剂。以TTB为前驱体，酚醛树脂为前驱体，制备了ィイD22ィエD2和活性碳。以ィイ为原料，在酚醛树脂的甲醇溶液中，通过水解法制备了胶体纳米二氧化钛ィエD22 D2。用N-ィイ-D22-ィエ-D2在400~800℃的温度范围内碳化了含有TiOXD22-D2粒子的酚醛树脂。得到了晶粒度约为7.0 nm的锐钛矿型二氧化钛。以醋酸的光解为模型反应。由于比表面积的增大导致了ィイD22ィエD2催化剂对醋酸的吸附能力增强，因此采用了空气活化的方法来提高碳载体的比表面积。光催化活性随比表面积的增大而提高。