| Si掺杂TiO2纳米管阵列制备、表征及其光催化氧化降解室内典型VOCs |
| 摘要点击 2439 全文点击 1288 投稿时间：2011-03-24 修订日期：2011-07-13 |
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| 中文关键词 掺硅 二氧化钛纳米管 阳极氧化 光催化氧化 甲苯 |
| 英文关键词 Si-doped TiO2 nanotubes anodic oxidation photocatalytic oxidation toluene |
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| 中文摘要 |
| 以Na2SiF6/HF为电解液,采用阳极氧化法一步制备了Si掺杂的TiO2纳米管阵列光催化剂,通过SEM、XRD、DRS和EDX等表征手段对制备的催化剂进行了表征,并以甲苯为降解目标物,考察了Si掺杂的TiO2纳米管阵列光催化剂的活性以及各种反应参数对活性的影响.结果表明,TiO2纳米管阵列以锐钛矿和金红石2种晶形存在,Si高分散于TiO2纳米管的管壁上.Si的掺杂提高了TiO2对紫外光的吸收,其禁带宽度与TiO2相比发生了蓝移.Si掺杂的TiO2纳米管阵列具有较大比表面积.当以电解液中Na2SiF6浓度为0.03 mol·L-1,在400℃焙烧1 h制备的Si掺杂的TiO2纳米管阵列为光催化剂时,甲苯的降解率最高,降解率达到60%,与纯TiO2纳米管阵列相比,催化活性提了1倍. |
| 英文摘要 |
| The Si-doped TiO2 nanotubes photocatalysts was synthesized by anodic oxidation method, which used Na2SiF6/HF as an electrolyte, and was characterized by means of SEM, XRD, DRS and EDX. TiO2 nanotubes composed of anatase phase and rutile phase, and Si was highly dispersed on the wall of TiO2 nanotubes. The photocatalytic activity of the Si-doped TiO2 nanotubes was investigated for photocatalytic degradation of gaseous toluene. It was found that the photocatalytic activity of Si-doped TiO2 nanotubes, which prepared by 0.03 mol·L-1 Na2SiF6/HF and calcined at 400℃ for 1 h, was the highest. The conversion of toluene was 60% over the prepared Si doped TiO2 nanotubes under UV light, which was one times higher than that of pure TiO2 nanotubes. |
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