Chemical adsorption of nitrogen dioxide with an activated carbon adsorption system

Mei Ling Fang, Ming Shean Chou, Cheng Yu Chang, Hsiao Yu Chang, Chih Hsiang Chen, Sheng Lun Lin, Yen Kung Hsieh

研究成果: Article同行評審

13 引文 斯高帕斯(Scopus)

摘要

Nitrogen dioxide (NO2) is a pollutant that directly harm the human respiratory system, lead to inflammation, as well as to form the secondary aerosol pollutants. The main NO2 sources, combustion or thermal processes, were well controlled. However, the metal etching operation in semiconductor industry emits flue gases with reddish-brown NO2 fume that leads to visibility reduction, acidic odor, as well as negative effects on human health. In this study, a stream of flue gases with low NO2 (230 ± 10 ppm) and NO (50 ppm) concentrations were conducted to pass through an activated carbon-packed fixed bed for analyzing the adsorptive conversion behavior of NO2 by the activated carbon (AC) at room temperature. The repeated adsorption test was carried out by washing the regenerated waste carbon with a caustic solution and water and drying. Results propose that at the beginning of adsorption, nitrogen dioxide combined with carbon to form NO and desorbed from carbon surface. The net adsorptive conversion removal capacity of NO2 by the virgin AC and regenerated AC was 224 and 155 mg g–1 AC, respectively. Regeneration restored around 70–75% of effective surface area, pore volume, and adsorptive conversion capacity of the virgin AC. Leached caustic solution obtained from the carbon regeneration contained only nitrate and the phenomena indicates the adsorbed-C2 (ONO2 ) hydrolyzed following the equation 2-C2 (ONO2 ) + H2 O → 3-C* +-C(O) + 2 HNO3, where-C* denotes active site on the carbon surface.

原文English
頁(從 - 到)2568-2575
頁數8
期刊Aerosol and Air Quality Research
19
發行號11
DOIs
出版狀態Published - 2019 11月

All Science Journal Classification (ASJC) codes

  • 環境化學
  • 污染

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