| 气相中芥子气模拟剂2-CEES在SO42-/TiO2上的光催化消除 |
| 摘要点击 634 全文点击 1175 投稿时间：2004-07-09 修订日期：2004-09-28 |
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| 中文关键词 光催化 2-CEES 酸化TiO2 负载化 |
| 英文关键词 photocatalysis 2-CEES sulphatized TiO2 supported |
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| 中文摘要 |
| 与传统洗消法相比,光催化技术消除军用毒剂具有高效和无二次污染等优点,但TiO2的活性较低且易于失活以致难于实际使用.采用稀硫酸对TiO2进行表面修饰制备出了SO42-/TiO2催化剂,在连续流动微分反应器上考察其对芥子气模拟剂2-chloroethyl ethyl sulfide(2-CEES)的光催化降解活性和稳定性,并与TiO2进行了比较.结果表明,硫酸化处理不但可提高TiO2的活性也可提高其活性稳定性,其中以200℃焙烧所得样品ST200的性能最好.还研究了反应温度和水蒸气对ST200上2-CEES光催化降解的影响,发现在90℃反应,催化剂有较高的活性和稳定性;当给2-CEES初始浓度<61μL·L-1 的体系中添加30.5mL·L-1的水蒸气时,催化剂可维持长久的高活性.还发现将SO42-/TiO2负载在γ-Al2O3、SiO2和木质活性炭(AC)上可提高SO42-/TiO2的活性和稳定性,其中以SiO2载体最佳. |
| 英文摘要 |
| Disinfection with photocatalysis, compared to with the conventional cleanout, is both high efficient and non contaminative, but the simple TiO2 photocatalyst is showing to be of low activity and low active stability so to be hardly practical application. In the paper, SO42-/TiO2were papered by surface modification of TiO2 with dilute H2SO4, and the photocatalytic degradation of 2-chloroethyl ethyl sulfide (2-CEES) on the samples was examined in a fixed-bed microreactor. The examination show that the acidic modification enhanced both the activity and the active stability of TiO2, and the sample ST200 prepared by calcination at 200℃ was better than ST400 by calcination at 400℃. The effect of water vapor content and reaction temperature on the photocatalytic degradation of 2-CEES was also tested, showing that the sample ST200 had high activity and stability at 90 ℃, and kept a constant activity when adding 30.5 mL/L water vapor into the reactive system in which 2-CEES initial concentration was low to <61 μL·L-1. In addition, it was found that supporting SO42-/TiO2 on γ-Al2O3, SiO2 and active carbon could improve on the activity and stability of SO42-/TiO2, and on supports SiO2 is the best one. |
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