环境污染治理技术及原理
钱春香,赵联芳,付大放,李丽,王瑞兴.温湿度和光强对水泥基材料负载纳米TiO2光催化氧化氮氧化物的影响[J].环境科学学报,2005,25(5):623-630
温湿度和光强对水泥基材料负载纳米TiO2光催化氧化氮氧化物的影响
- Study on the effect of temperature, humidity and light intensity on photocatalytic oxidation of NO2 by Nano-TiO2 immobilized on cement-based materials
- 基金项目：江苏省建设厅科技计划(JS200334);南京市建设委员会2004年科技计划;江苏省无机及其复合新材料重点实验室开放基金
- 作者
- 单位
- 钱春香
- 东南大学绿色建材技术研究所, 南京 210096
- 赵联芳
- 东南大学绿色建材技术研究所, 南京 210096
- 付大放
- 东南大学绿色建材技术研究所, 南京 210096
- 李丽
- 东南大学绿色建材技术研究所, 南京 210096
- 王瑞兴
- 东南大学绿色建材技术研究所, 南京 210096
- 摘要：研究了路面水泥基材料负载纳米TiO2光催化氧化汽车尾气中氮氧化物过程中湿度、温度和光强对催化反应的影响.试验和分析结果表明,光催化氧化效率随湿度增加而急剧下降;当NO2浓度较低时,光辐照强度对光催化氧化效率的影响不显著;NO2浓度较高时,随着光辐照强度的增强,光催化氧化效率呈现出上升趋势,在太阳光的照射下或在室内较弱紫外光照射下都具有良好的光催化氧化作用.在0～25℃的温度范围内,光催化氧化效率随温度升高而提高,而在25～60℃范围内温度的影响并不显著.
- Abstract：It investigated that the effect of humidity, temperature and radiation intensity on photocatalysis and oxidation of NO2 from car tail gas by nano-TiO2 immobilized on cement-based road materials. The research results showed that the efficiency of photocatalytic oxidation of NO2 reduced sharply with the increase of humidity. But the efficiency of photocatalytic oxidation of NO2 was affected little by the radiation intensity when the concentration of NO2 was low. On the contrary, the efficiency increased with the increase of radiation intensity when the concentration of NO2 was high. The photocatalysis and oxidation of NO2 was kept in a considerable good level both in sunlight and in poor ultraviolet light indoors. In the range from 0℃ to 25℃, the efficiency of photocatalytic oxidation of NO2 increased with the increase of temperature. But in the range from 25℃ to 60℃, the efficiency was not significantly affected by the temperature.
- Key words：temperature humidity radiation intensity cement-based materials nano-TiO2 photocatalysis NO2
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