Different Roles of Water in Photocatalytic DeNOx Mechanisms on TiO2: Basis for Engineering Nitrate Selectivity?
Different Roles of Water in Photocatalytic DeNOx Mechanisms on TiO2: Basis for Engineering Nitrate Selectivity?
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DOI：
10.1021/acsami.7b01989
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发表时间：
2017-05
影响因子：
9.5
通讯作者：
Lu Yang;A. Hakki;Fazhou Wang;D. Macphee
中科院分区：
文献类型：
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作者：
Lu Yang;A. Hakki;Fazhou Wang;D. Macphee
TiO 2的硝酸盐选择性对其作为NOx去污染光催化剂的效率具有重要影响。通常最强调的是光催化剂活性，即NOx浓度降低速率的量度，但NOx浓度（主要是NO + NO2）的降低不一定是大气NO2浓度的降低，因为催化过程本身会产生NO2。由于NO2的毒性比NO大得多，因此应在工程光催化系统中更加重视硝酸盐选择性，即NOx转化为硝酸盐的措施，以及如何最大限度地提高硝酸盐选择性，以改善城市空气质量。这项研究，在NOx的光催化氧化中吸附的水的重要性，已经确定了重要的相关性，区分的作用，水在NO和NO2的氧化。这一观察结果意义重大，并为控制TiO 2上的硝酸盐选择性和提高环境光催化剂应用效率的潜力提供了见解。
The nitrate selectivity of TiO2 has important consequences for its efficiency as a NOx depollution photocatalyst. Most emphasis is typically given to photocatalyst activity, a measure of the rate at which NOx concentrations are reduced, but a reduction in NOx concentration (mainly NO + NO2) is not necessarily a reduction in atmospheric NO2 concentration because the catalytic process itself generates NO2. With NO2 being considerably more toxic than NO, more emphasis on nitrate selectivity, a measure of the NOx conversion to nitrate, and how to maximize it, should be given in engineering photocatalytic systems for improved urban air quality. This study, on the importance of adsorbed water in the photocatalytic oxidation of NOx, has identified important correlations which differentiate the role that water plays in the oxidation of NO and NO2. This observation is significant and offers insights into controlling nitrate selectivity on TiO2 and the potential for increased effectiveness in environmental photocatalyst applications.