| Title: | Photochemical removal of acetaldehyde using 172 nm vacuum ultraviolet excimer lamp in N(2) or air at atmospheric pressure |
| Author(s): | Tsuji M; Miyano M; Kamo N; Kawahara T; Uto K; Hayashi JI; Tsuji T; |
| Address: | "Institute for Materials Chemistry and Engineering and Research and Education Center of Green Technology, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan. tsuji@cm.kyushu-u.ac.jp. Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan. tsuji@cm.kyushu-u.ac.jp. Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan. Institute for Materials Chemistry and Engineering and Research and Education Center of Green Technology, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan. Interdisciplinary Factory of Science and Engineering, Department of Materials Science, Shimane University, Matsue, Shimane, 690-8504, Japan" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-019-04475-w |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "The photochemical removal of acetaldehyde was studied in N(2) or air (O(2) 1-20%) at atmospheric pressure using side-on and head-on types of 172 nm Xe(2) excimer lamps. When CH(3)CHO was decomposed in N(2) using the head-on lamp (HL), CH(4), CO, and CO(2) were observed as products in FTIR spectra. The initial removal rate of CH(3)CHO in N(2) was ascertained as 0.37 min(-1). In air (1-20% O(2)), HCHO, HCOOH, CO, and CO(2) were observed as products in FTIR spectra. The removal rate of CH(3)CHO in air using the side-on lamp (SL) increased from 3.2 to 18.6 min(-1) with decreasing O(2) concentration from 20 to 1%. It also increased from 2.5 to 3.7 min(-1) with increasing CH(3)CHO concentration from 150 to 1000 ppm at 20% O(2). The best energy efficiency of the CH(3)CHO removal using the SL in a flow system was 2.8 g/kWh at 1% O(2). Results show that the contribution of O((1)D) and O(3) is insignificant in the initial decomposition of CH(3)CHO. It was inferred that CH(3)CHO is initially decomposed by the O((3)P) + CH(3)CHO reaction at 5-20% O(2), whereas the contribution of direct vacuum ultraviolet (VUV) photolysis increases concomitantly with decreasing O(2) pressure at < 5% O(2). After initial decomposition of CH(3)CHO, it was oxidized further by reactions of O((3)P), OH, and O(3) with various intermediates such as HCHO, HCOOH, and CO, leading to CO(2) as a final product" |
| Keywords: | Acetaldehyde/*analysis/radiation effects Air Pollutants/*analysis/radiation effects Atmospheric Pressure Nitrogen/*chemistry Oxidation-Reduction *Photolysis *Ultraviolet Rays Vacuum Volatile Organic Compounds/*analysis/radiation effects Acetaldehyde Catal; |
| Notes: | "MedlineTsuji, Masaharu Miyano, Masato Kamo, Naohiro Kawahara, Takashi Uto, Keiko Hayashi, Jun-Ichiro Tsuji, Takeshi eng Germany 2019/02/25 Environ Sci Pollut Res Int. 2019 Apr; 26(11):11314-11325. doi: 10.1007/s11356-019-04475-w. Epub 2019 Feb 23" |
