Specific photocatalytic performance of nanostructured rutile-type Tio2: Selective oxidation of thiazin dye with a bundled architecture consisting of oriented nanoneedles
Specific photocatalytic performance of nanostructured rutile-type Tio2: Selective oxidation of thiazin dye with a bundled architecture consisting of oriented nanoneedles
复制标题
纳米结构金红石型二氧化钛的特定光催化性能：具有由定向纳米针组成的束状结构的噻嗪染料的选择性氧化
DOI：
10.1166/sam.2010.1078
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
H. Imai
中科院分区：
文献类型：
--
作者：
Y. Tokunaga;Hiroaki Uchiyama;Y. Oaki;H. Imai
通过比较噻嗪染料亚甲基蓝与分散的金红石纳米针和金红石纳米颗粒的反应，研究了由取向纳米针组成的纳米结构金红石的光催化活性。亚甲基蓝的脱甲基化优选地通过在UV照射下的部分氧化而发生，其中成束的金红石纳米针具有小的间隙。另一方面，大部分染料分子通过分散的金红石纳米棒和纳米颗粒的还原途径的引发而直接脱色。金红石纳米针的（110）位上的还原位点主要位于束状结构内的小间隙中。由于大尺寸有机分子向还原位点的扩散将受到限制，因此在紫外光照射下，金红石束选择性地诱导染料分子的氧化途径。
The photocatalytic activity of a nanostrcutured rutile consisting of oriented nanoneedles was studied by comparing a reaction of a thiazin dye, methylene blue, with dispersed rutile nanoneedles and anatase nanoparticles. Demethylation of methylene blue occurred preferably through partial oxidation under UV irradiation with the bundled rutile nanoneedles having small clearance gaps. On the other hand, most of the dye molecules were directly decolorized through the initiation by a reductive pathway with the dispersed rutile nanorods and the anatase nanoparticles. The reductive sites on (110) of the rutile nanoneedles were dominantly located in the small gaps inside the bundled architecture. Because the diffusion of large-sized organic molecules to the reductive sites would be restricted, the oxidative route for the dye molecule was selectively induced with the rutile bundles under UV irradiation.