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›› 2008, Vol. 8 ›› Issue (5): 978-982.

• 材料工程专栏 • 上一篇    下一篇

盐酸浓度及煅烧温度对水热法制TiO2纳米管性能的影响

周利民 刘峙嵘 黄群武   

  1. 东华理工大学应用化学系 江西抚州东华理工大学应用化学系 天津大学化工学院
  • 收稿日期:2008-05-29 修回日期:2008-07-01 出版日期:2008-10-20 发布日期:2008-10-20
  • 通讯作者: 周利民

Effects of HCl Concentration and Calcination Temperature on Properties of Titanate Nanotubes

ZHOU Li-min ZHU Xia-ping GUANG Qun-wu   

  1. Department of Applied Chemistry, East China Institute of Technology Fuzhou Department of Applied Chemistry, East China Institute of Technology Fuzhou School of Chemistry and Chemical Engineering, Tianjin University
  • Received:2008-05-29 Revised:2008-07-01 Online:2008-10-20 Published:2008-10-20
  • Contact: ZHOU Li-min

摘要: 采用水热法制备了TiO2纳米管(TIN),利用TEM、XRD和N2吸附/脱附等温线对其进行了表征. 考察了酸洗HCl浓度及煅烧温度对TIN微结构及光催化活性的影响,以甲基橙为模型化合物对TIN的光催化活性进行了评价. 结果表明,随HCl浓度升高(0.001~0.1 mol/L),TIN样品中Na含量下降(7.25%~0, w),高HCl浓度洗涤会破坏TIN纳米管结构;TIN比表面积和孔容均随煅烧温度升高而下降,最高值分别为353 m2/g和1.70 cm3/g. 煅烧温度还影响TIN中金红石相含量及结晶度. 两因素对TIN光催化活性的影响可以通过其比表面积、孔容变化及锐钛矿相含量与结晶度来阐释. TIN对甲基橙的光催化活性次序为TIN-0.01 (HCl 0.1 mol/L)>TIN-0.1 (HCl 0.1 mol/L)>TIN-0.001 (HCl 0.001 mol/L);最大表观反应速率常数分别为0.84(TIN-0.01), 0.55(TIN-0.1)和0.30 h-1 (TIN-0.001).

关键词: TiO2纳米管, HCl浓度, 煅烧温度, 甲基橙, 光催化

Abstract: Titanate nanotubes (TIN) were prepared with a hydrothermal method and characterized by TEM, XRD and nitrogen adsorption-desorption isotherms. The effects of HCl concentration and calcination temperature on microstructure and photocatalytic activity of TIN were investigated. The photocatclytic activity of TIN was evaluated using methyl orange as model compound. The results showed that with increasing HCl concentration from 0.001 mol/L to 0.1 mol/L, the sodium content of TIN decreased from 7.25%(w) to 0, and the TIN morphology might be destroyed. The specific surface area and pore volume of TIN decreased with increasing calcination temperature with the maximum value of 353 m2/g and 1.70 cm3/g, respectively. The amount of anatase phase and crystallization degree of TIN were also affected by calcination temperature. The dependence of photocatalytic activity of TIN on both factors can be interpreted with variations of specific surface area, pore volume, amount of anatase phase and degree of crystallization during the sodium exchange and heat treatment process. The photocatalytic activity order of TIN samples toward methyl orange was obtained as: TIN-0.01 (HCl 0.01 mol/L)>TIN-0.1 (HCl 0.1 mol/L)>TIN-0.001 (HCl 0.001 mol/L), and the maximum apparent reaction rate constant (h-1) was 0.84 for TIN-0.01, 0.55 for TIN-0.1, and 0.30 for TIN-0.001, respectively.

Key words: TiO2 nanotubes, HCl concentration, calcination temperature, methyl orange, photocatalysis

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