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튜브 전기로를 이용한 TiO₂ 나노입자의 합성 및 특성 분석
배귀남,현정은,이태규,정종수 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.3
Titania particles are widely used as a photocatalyst to treat various contaminants in air and water. Titania particles were formed by vapor-phase oxidation of titanium tetraisopropoxide (TTIP) in a tube furnace between 773 and 1,273 K. The effect of process variables such as furnace temperature. flow rate of carrier air. and flow rate of sheath air on powder size and phase characteristics was investigated using a scanning mobility particle sizer (SMPS), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The size distribution of synthesized titania particles was characterized with mode diameter and peak concentration. The mode diameter ranging from 20 to 80 nm decreased with increasing flow rates of sheath air and carrier air, and increased with increasing furnace temperature. The peak concentration increased with increasing flow rates of sheath air and carrier air. The best synthetic condition for high production rate can be derived from the experimental data set represented by mode diameter and peak concentration. The crystal structure of synthesized titania particles was found to be anatase phase, ensuring high photocatalytic potential.
배귀남,김민철,이승복,송기범,진현철,문길주 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.4
A multi-functional indoor smog chamber was designed and evaluated lo investigate photochenical or water vapor reaction mechanisms of air pollutants. Various smog chamber experiments could be conducted using ambient air or purified air in this smog chamber. The smog chamber consisted of a housing, a Teflon bag, blacklights, injection ports, sampling ports, and utility facilities. The characteristics of light source, the wall losses of air pollutants, and the quality of purified air were experimentally investigated. The maximum NO₂ photolysis rate was 1.10min^(-1). In a 2.5-m³ Teflon bag, the wall losses of ambient O₃, NO, and NO₂were 1.2~2.4×10^(-3)min^(-1), 0.7~2.0×10^(-3)min^(-1), and 0.4-2.0×10^(-3)min^(-1), respectively. The wall loss of ambient particles ranging 0.05 to 0.2㎛ was 1.8~5.4×10^(-3)min^(-1), which was slightly higher than those of ambient gaseous species. The purified air supply system provided high quality of air with NO₂, < 1 ppb, and total hydrocarbons <5 ppb.
초기 톨루엔 농도가 톨루엔-NO_(x)-공기 혼합물의 광산화 반응에 미치는 영향 : II. 입자상 물질의 생성 및 성장 II. Aerosol Formation and Growth
이영미,배귀남,이승복,김민철,문길주 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1
An experimental investigation of the gas-phase photooxidation of toluene-NOx-air mixtures at sub-ppm concentrations has been carried out in a 6.9 ㎡, indoor smog chamber irradiated by blacklights. Measured parameters in the toluene-NO_(x) experiments included aerosol, O₃, NO, NO₂, NO_(x), CO, SO₂, toluene, and air temperature. The initial toluene concentration ranged from 225 ppb to 991 ppb and the initial concentration ratio of toluene/NOx in ppbC/ppb was in the range of 5~20. It was found that the variation of aerosol number concentration with irradiation time caused by the photooxidation of toluene-NOx-air mixtures depended on the initial toluene concentration for similar concentration ratio of toluene/NO_(x). The dependency of initial toluene concentration on the photooxidation of toluene-NO_(x)-air mixtures for toluene/NOx=5~6 seemed to be opposite to that for toluene/NO_(x)= 10~11. The maximum number concentration of aerosols formed by photooxidation and the aerosol yield depended on both initial toluene concentration and initial concentration ratio of toluene/NO_(x). In this study, the aerosol yield, defined as aerosol formed per unit toluene consumed, was found to be 0.01~0.16.
초기 톨루엔 농도가 톨루엔-NOx-공기 혼합물의 광산화 반응에 미치는 영향 : I. 가스상 물질의 변화 I. Change of Gaseous Species
이영미,배귀남,이승복,김민철,문길주 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1
An experimental investigation of the gas-phase photooxidation of toluene-NO_(x)-air mixtures at sub-ppm concentrations has been carried out in a 6.9 ㎥, indoor smog chamber irradiated by blacklights. Measured parameters in the toluene-NOx experiments included O₃, NO, NO₂, NO_(x), CO, SO₂, toluene, and air temperature. The initial toluene concentration ranged from 225 ppb to 991 ppb and the initial concentration ratio of toluene/NOx in ppbC/ppb was in the range of 5~20. It was found that the variation of gaseous species with irradiation time caused by the photooxidation of toluene-NOx-air mixtures depended on the initial toluene concentration for similar concentration ratio of toluene/NOx. The dependency of initial toluene concentration on the photooxidation of toluene-NO_(x)-air mixtures for toluene/NOx =5~6 seemed to be opposite to that for toluene/NOx=10~11. The arriving time at maximum ozone concentration depended on both initial toluene concentration and initial concentration ratio of toluene/NOx. However, the maximum concentration of ozone formed by photooxidation depended only on the initial toluene concentration.
이승복,배귀남,진현철,김영성,문길주,심상규 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.1
Air pollutants were measured eight times from June 1999 to June 2002 on regular ferries cruising across the Yellow Sea between Incheon in Korea and Qingdao or Tianjin in China. PM_(10) and PM_(2.5_ were measured as particulate matters and SO₂, CO, and NOx were measured as gaseous pollutants. On each route, sampling was made, starting two hour after departure and ending two hour before arrival. Low concentrations of gaseous pollutants that were not much varied according to sampling period and location revealed that atmosphere over the sea was not directly affected by anthropogenic emissions. However, concentrations of fine particles were generally higher than those measured at Deokjeok Island. 50 km west of the western seashore, at similar periods. It was believed that considerable influence of China in the form of secondary pollutants was exerted over the sea.
스모그 챔버에서 수분 반응에 의한 대기 에어로졸의 생성 및 성장
김민철,배귀남,문길주,박주연 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.2
Aerosol formation and growth by water vapor reactions were investigated in a 2.5-㎥ indoor smog chamber filled with the unfiltered ambient air. The relative humidity of test ambient air was elevated at 59~64% or 84~88% by adding water vapor. The aerosol number size distribution and the concentrations of O₃, NO, NO₂, and SO₂ were measured during the experiments. The O₃, and NO₂ gases were well reacted with the water vapor at high relative humidity of 84~88%, and the reaction rates of these gases seemed to be decreased at low relative humidity of 59~64%. The formation and condensational growth phenomena of ambient aerosols by water vapor reactions were observed in a Teflon bag, depending strongly on the initial particle size distribution. The water vapor reactions might be affected by the contents of oxidants produced by photochemical reactions under sunlight.
Vehicle-related Fine Particulate Air Pollution in Seoul, Korea
Bae, Gwi-Nam,Lee, Seung-Bok,Park, Su-Mi Korean Society for Atmospheric Environment 2007 Asian Journal of Atmospheric Environment (AJAE) Vol.1 No.1
Vehicle exhaust is a dominant source of air pollutants in urban areas. Since people are easily exposed to vehicle exhaust particles while driving a car and/or traveling via public transportation, air pollution near traffic has been extensively studied in developed countries. In this paper, investigations on vehicle-related fine particulate air pollution at roadsides and on roads in Seoul, Korea were reviewed to understand air pollution near traffic. Comparison of $PM_{10}$ concentrations in Seoul showed that roadside air is more contaminated than urban air, implying that exposure levels near vehicular emissions are more critical to sensitive persons. Concentrations of ultrafine particles and BC (black carbon) at roadsides of Seoul fluctuate highly for short durations, responding to traffic situations. Diurnal variations of ultrafine particles and BC concentrations at roadsides seem to be affected by traffic volume, mixing layer height, and wind speed. Concentrations of ultrafine particles and BC decrease as distance from the road increases due to dilution during transport. On-road air pollution seems to be more severe than roadside air pollution in Seoul. Since nearby traffic air pollution has not been well understood in Seoul, further studies including various vehicular air pollutants and representative locations are needed.