化学学报 ›› 2008, Vol. 66 ›› Issue (11): 1301-1306. 上一篇    下一篇

研究论文

阳极氧化制备TiO2纳米管及其光催化性能

万斌*,1,沈嘉年1,陈鸣波2,王东2,张新荣2,李谋成1   

  1. (1上海大学材料研究所 上海 200072)
    (2上海空间电源研究所 上海 200233)
  • 投稿日期:2007-09-29 修回日期:2007-11-09 发布日期:2008-06-14
  • 通讯作者: 万斌

Preparation of TiO2 Nanotubes by Anodization and Its Photocatalytic Performance

WAN, Bin*,1; SHEN, Jia-Nian1; CHEN, Ming-Bo2; WANG, Dong2; ZHANG, Xin-Rong2; LI, Mou-Cheng1   

  1. (1 Institute of Materials, Shanghai University, Shanghai 200072)
    (2 Shanghai Institute of Space Power-source, Shanghai 200233)
  • Received:2007-09-29 Revised:2007-11-09 Published:2008-06-14
  • Contact: AN, Bin

采用电化学阳极氧化法在纯Ti表面制备出结构整齐有序的TiO2纳米管阵列, 研究了不同溶液体系对TiO2纳米管尺寸和形貌的影响. 利用X射线衍射仪和场发射扫描电镜表征所制备的TiO2纳米管. 20 V反应15 h, 0.5 wt% HF+1 mol/L (NH4)H2PO4溶液中TiO2纳米管直径为70~90 nm, 长度约2.2 μm, 在500 ℃的空气气氛下退火1 h, 纳米管薄膜以锐钛矿结构为主, 在该条件下所制备TiO2纳米管的光电流密度达到3.2 mA/cm2. 以该纳米管薄膜为光阳极, 施加0.45 V (vs. SCE)的外加偏压, 在125 W紫外光照射5 h后, 初始摩尔浓度为20×10-6 mol/L的酸性红G (C18H13N3Na208S2)在pH=3时, 降解率达到92.4%.

关键词: 阳极氧化, TiO2纳米管, 酸性红G, 光催化降解

High density, well ordered, vertically aligned and uniform titanium oxide nano-tube arrays were fabricated on the surface of a pure titanium sheet by direct electrochemical anodic oxidation. The effect of different electrolytes on dimension and morphology has been studied. XRD and FE-SEM techniques have been used to characterize the titanium oxide nano-tube arrays. SEM shows that in an electrolyte of 0.5 wt% HF length of the nano-tubes did not increase after 20 mins. While in electrolyte of 0.5 wt% HF+1 mol/L (NH4)H2PO4, at 20 V anodizing voltage after 15 h, the average diameter of an nano-tubes was about 70~90 nm, and length of the nano-tubes was about 2.2 mm. XRD shows that after annealed for 1 h under 500 ℃ in air, the primary phase became anatase phase of TiO2. Photo-electrochemical character curves have been measured in an electrolyte of 1 mol/L KOH under irradiation of a high-voltage mercury lamp, at photocurrent of about 3.2 mA/cm2 for the nano-tubes of about 2.2 mm. Using the TiO2 nano-tubes of about 2.2 μm in length as anode, under illumination of the high-voltage mercury lamp at 0.45 V (vs. SCE) bias potential, after 5 h, the degradation degree of an acid red G electrolyte was about 92.4%.

Key words: anodic oxidation, TiO2 nano-tubes, acid red G, photocatalytic degradation