光催化
氮氧化物
催化作用
材料科学
化学工程
降级(电信)
纳米颗粒
贵金属
傅里叶变换红外光谱
微球
金属
原位
纳米技术
光化学
化学
有机化学
冶金
燃烧
工程类
电信
计算机科学
作者
He Ma,Dashuai Li,Yingying Li,Yuanyuan Li,Changhua Wang,Xintong Zhang
标识
DOI:10.1016/j.seppur.2024.126357
摘要
While photocatalytic technology has been recognized as an effective means for removing low-concentration NOx in ambient atmosphere, it still faces the challenge of the deep oxidation in high efficiency. In many cases, the release of more toxic NO2 byproduct appeared to be inevitable during the photocatalytic oxidation of NO. Herein we report that the atomically dispersed MnOx cocatalyst on TiO2(B) microspheres could significantly enhance the deep oxidation of NOx under mild photocatalytic conditions (1 mW/cm2 UV-A light, 1 L/min flow rate). At an initial NO concentration of 0.35 ppm, ca. 67.15% of NO is oxidized on the MT-0.5 sample, which is 2.76 times higher than the pristine TiO2(B) sample. More importantly, the release of NO2 is suppressed by 2.11 times. Comprehensive spectral analyses suggest that atomically dispersed MnOx effectively promotes the charge separation of photogenerated carriers in TiO2(B), even better than MnOx nanoparticles-loaded TiO2(B). EPR and in-situ FTIR analyses illustrate that atomically dispersed MnOx-loaded TiO2(B) sample exhibits excellent low concentration NOx abatement performance, thus providing a rational mechanism for the NO deep oxidation pathway. This study not only provides a unique approach for preparing non-noble metal atomically dispersed co-catalysts, but also affords an effective means for efficient photocatalytic NO degradation.
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