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수원시 대기 중 이산화질소(NO₂) 농도변화 특성에 관한 연구
조기철 동남보건대학 2009 論文集-東南保健大學 Vol.27 No.2
In this study, we selected 6 cities(Suwon- city, Seongnam- city, Anyang-city, Goyang- city, Bucheon- city, Ansan- city) in Kyeonggi province. Nitric dioxide had been coUected at the urban air monitoring stations from an. in 2001 to Dec. in 2007, and analyzed in order to investigate the characteristics of Nitric dioxide concentration. For this study, the variations of Nitric dioxide concentrations yearly and monthly were investigated. Also, the characteristics of Nitric dioxide in each season and site were investigated in the air of Suwon-city.
Photocatalytic Decomposition of Gaseous Acetaldehyde by Metal Loaded TiO2 with Ozonation
조기철,여현구 한국대기환경학회 2006 한국대기환경학회지 Vol.22 No.E1
The decomposition of gaseous CH3CHO was investigated by metal loaded TiO2 (pure TiO2, Pt/TiO2,Pd/TiO2, Mn/TiO2 and Ag/TiO2) with UV/TiO2 process and UV/TiO2/O3 process at room temperature andatmospheric pressure. Metal loaded TiO2 was prepared by photodeposition. Decomposition of CH3CHO wascarried out in a ow-type photochemical reaction system using three 10W black light lamps (300~ 400nm)as a light source. The experimental results showed that the degradation rate of CH3CHO was increased withPt and Ag on TiO2 compared to pure TiO2, but decreased with depositing Pd and Mn on pure TiO2. Theconsiderable increase in the degradation efficiency of the CH3CHO was found by a combination ofphotocatalysis and ozonation as compared to only by ozonation or photocatalysis. Loading of Pt on TiO2promoted conversion of gaseous ozone. The degradation rate of gaseous CH3CHO decreased with anincrease of water vapor in the feed stream for the both UV/TiO2 and UV/TiO2/O3 processes. The pure TiO2was more affected by the water vapor than Pt loaded TiO2.