Dependence of photocatalytic activity on particle size of a shape-controlled anatase titanium(IV) oxide nanocrystal
Dependence of photocatalytic activity on particle size of a shape-controlled anatase titanium(IV) oxide nanocrystal
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DOI：
10.1016/j.molcata.2012.03.003
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发表时间：
2012-06
影响因子：
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通讯作者：
N. Murakami;Shota Kawakami;Toshiki Tsubota;T. Ohno
中科院分区：
文献类型：
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作者：
N. Murakami;Shota Kawakami;Toshiki Tsubota;T. Ohno
以聚乙烯醇（PVA）为形貌控制剂，通过水热处理过钛酸（PTA）溶液，制备了{101}和{001}晶面裸露的十面体四方相氧化钛（TiO 2）。PTA溶液的pH值、PVA和非晶TiO 2的含量对所制备的颗粒的尺寸和形状有很大的影响，十面体TiO 2的颗粒宽度在25 ~ 60 nm之间可控。通过粒径与光催化活性之间的关系考察了十面体TiO 2的光催化活性。颗粒宽度约为100 nm的十面体TiO 2。40 nm的催化剂表现出优异的催化活性，这是因为在氧化还原位点的有效分离和大的比表面积之间达到了最佳的平衡。
Decahedral anatase titanium(IV) oxide (TiO2) with {101} and {001} exposed crystal faces was prepared by hydrothermal treatment of peroxo titanic acid (PTA) solution with polyvinyl alcohol (PVA) as a shape-control reagent. pH of the PTA solution and amounts of PVA and amorphous titania included in the PTA solution had a large influence on size and shape of the prepared particles, and particle width of the decahedral anatase TiO2was controllable between 25 and 60nm. Photocatalytic activity of the decahedral anatase TiO2was examined in terms of the relationship between particle size and photocatalytic activity. Decahedral anatase TiO2with particle width of ca. 40nm showed excellent activity because of the optimized balance between efficient separation of redox sites and large specific surface area.