Synthesis and characterization of Y3+-doped TiO2 nanocomposites for photocatalytic applications
Synthesis and characterization of Y3+-doped TiO2 nanocomposites for photocatalytic applications
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DOI：
10.1088/0957-4484/20/25/255601
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发表时间：
2009-06
期刊：
影响因子：
3.5
通讯作者：
H. Narayan;H. Alemu;L. Macheli;Madhavi Thakurdesai;T. K. Gundu Rao
中科院分区：
文献类型：
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作者：
H. Narayan;H. Alemu;L. Macheli;Madhavi Thakurdesai;T. K. Gundu Rao
采用化学共沉淀法(CPH)制备了平均粒径为74 nm的TiO2.[Y2O3]x(x=0.1~0.4)纳米复合材料。考察了它们对刚果红(CR)染料的可见光催化降解活性。与固相反应(SSR)法制备的相同组成的多晶样品(平均粒径为几微米)以及纯的二氧化钛相比，所有纳米碳管的降解性都有所改善。纳米碳管具有较好的光催化活性是由于其粒径较小所致。在相似的实验条件下，将结果与锌/铁离子共掺的二氧化钛纳米管的结果进行了比较，结果表明，在掺Y3+的纳米管中，颗粒尺寸可能不是影响光催化性能的唯一因素。结果表明，Y3+离子对e-−/h+复合的抑制可能是导致进一步增强的可能因素。
The TiO2·[Y2O3]x (x = 0.1–0.4) nanocomposites (NCs) with an average particle size of 74 nm were prepared by the method of chemical co-precipitation followed by hydrolysis (CPH). Their visible light photocatalytic activity was investigated for the degradation of congo red (CR) dye. All NCs showed improved degradation as compared to the polycrystalline samples of similar compositions prepared by the solid-state reaction (SSR) route (average particle size of a few micrometers), as well as to the pure TiO2. The better photocatalytic activity of the NCs was attributed to their smaller particle size. Another comparison of the results with those obtained with Zn2+/Fe3+ ions co-doped TiO2 NCs, under similar experimental conditions, revealed that in the Y3+-doped NCs, particle size might not be the only factor responsible for the improved photocatalytic properties. It was concluded that the Y3+ ion-mediated suppression of the unwanted e−/h+ recombination could be the possible factor leading to additional enhancement.