Effects of calcination temperature on the microstructures and photocatalytic activity of titanate nanotubes
Effects of calcination temperature on the microstructures and photocatalytic activity of titanate nanotubes
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DOI：
10.1016/j.molcata.2006.01.003
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发表时间：
2006-04
影响因子：
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通讯作者：
Jiaguo Yu;Huogen Yu;B. Cheng;C. Trapalis
中科院分区：
文献类型：
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作者：
Jiaguo Yu;Huogen Yu;B. Cheng;C. Trapalis
将TiO 2粉末（P25）在10 M NaOH溶液中于150°C水热处理48 h，然后在不同温度下煅烧，制备了TiO 2纳米管。采用XRD、TEM、HRTEM、SEM、FESEM和N2吸附-脱附等温线对煅烧前后的钛酸盐纳米管进行了表征。以空气中的丙酮为目标物，考察了所制备样品的光催化活性。研究了煅烧温度对钛酸盐纳米管的物相结构、晶粒尺寸、形貌、比表面积、孔结构和光催化活性的影响。结果表明，在400至600°C下，煅烧的纳米管样品显示出比Degussa P25更高的光催化活性。特别是，在400和500°C下，煅烧的纳米管的光催化活性超过P25约3.0倍。这可能归因于前者具有较大的比表面积和孔体积。随着煅烧温度从700 °C进一步升高到900°C，煅烧后纳米管样品的光催化活性大幅下降，原因是金红石相的形成、TiO 2微晶的烧结和生长以及比表面积和孔容的减小。
Titanate nanotubes were prepared via a hydrothermal treatment of TiO2powders (P25) in a 10M NaOH solution at 150°C for 48h and then calcined at various temperatures. The as-prepared titanate nanotubes before and after calcination were characterized with XRD, TEM, HRTEM, SEM, FESEM, and nitrogen adsorption–desorption isotherms. The photocatalytic activity of the as-prepared samples was evaluated by photocatalytic oxidation of acetone in air. The effects of calcination temperature on the phase structure, crystallite size, morphology, specific surface area, pore structures and photocatalytic activity of the titanate nanotubes were investigated. The results indicated that at 400 to 600°C, the calcined nanotube samples showed a higher photocatalytic activity than Degussa P25. Especially, at 400 and 500°C, the photocatalytic activity of the calcined nanotubes exceeded that of P25 by a factor of about 3.0 times. This could be attributed to the fact that the former had a larger specific surface area and pore volume. With further increase in the calcination temperature from 700 to 900°C, the photocatalytic activity of the calcined nanotube samples greatly decreased due to the formation of rutile phase, the sintering and growth of TiO2crystallites and the decrease of specific surface area and pore volume.