• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2000년도 창립총회 및 춘계학술발표회
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• pp.153-156
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• 2000

본 연구에서는 지하수내에서의 오존의 거동과 오존산화공정에 의한 디젤의 분해를 조사하였다. 오존의 초순수와 지하수내에서의 반응은 모두 2차 분해반응속도식을 나타냈고, 초순수와 지하수내에서의 반감기는 각각 평균 37.5분, 14.7분으로 계산되었다. 지하수내에서 오존의 자가분해반응속도가 더 빠른 것으로 나타났는데 이는 오존이 지하수내에 존재하는 각종 유기·무기물질들과의 빠른 반응때문이라고 생각된다. 오존의 TCE, PCE 그리고 디젤의 빠른 제거효율을 통하여 디젤로 오염된 지하수를 처리하는데 있어서 오존산화공정은 효과적으로 적용될 수 있을 것이라 판단된다.

• Applied Microscopy
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• 제11권1호
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• pp.29-38
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• 1981

Bacteriophage f2 were treated with ozone at various concentrations for 20 minutes. The inactivation kinetics of f2 phage were examined during ozonation. In order to study the mode of action of ozone on the phage f2, absorption of the phage to the host pili was meassured by utilyzing radioactivity of tritium incorporated into the phage RNA. Sucrose density gradient analysis and electron microscopy were also used to prove the mechanism of ozone inactivation of the phage. Strucural proteins of the phage were broken by ozonation into many protein subunits. The extent of phage breakage was proportional to ozone concentration and reaction time. Percent decrease of the phage absorption to the host pili was coincident with the rate of ozone inactivation of the phage. Ozone inactivation of bacteriophage f2 was shown to be caused by the breakage of the structural protein and blockage of the phage absorption to the host pili.

• 미생물학회지
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• 제18권3호
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• pp.123-132
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• 1980

Bacterial virus f2 and its RNA were examined to elucidate the mode of ozone utilizing sucrose density gradient analysis and electtron microscopic techniques. the inactivation kinetics of the virus f2 by ozonation showed that the viruses were inactivated during the first 5 sec of the reaction and were further inactivated at a slower rate during the next 10 min at 0.09 and 0.8mg/l ozone concentrations. The virus coat was broken by ozonation into many pieces of protein subunits and the adsorption of the viruses to the host pili was inversely related to the extent of the breakage of the virus. The viral RNA was released from the virus particles during ozone, but ozone inactivation of the RNA enclosed in the protein coat could not ruled out the possibility that the RNA was secondarily sheared by a reaction with the broken coat protein.

• 대한화학회지
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• 제65권3호
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• pp.185-196
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• 2021

For studying the reaction mechanism of the reactions related to NO in the ozone denitration reactions, the harmonic and anharmonic rate constants were calculated by the transition state (TS) theory and Yao and Lin (YL) method. According to above calculations, the reactions of NO with O₃ and NO₃ play an essential role, and the kinetic parameters considering anharmonic effect were fitted. Furthermore, the rate constants were up as temperature increasing, and the tendencies of high temperature were more gradual than the low temperature. The research will provide theoretical basis for the ozone denitration reactions.

• 한국환경보건학회지
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• 제27권1호
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• pp.1-7
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• 2001

Ammonia is used in the manufacture of fertilizers, refrigerants, stabilizers and many household cleaning agents. These wide applications resulted in ammonia contamination in water. Ammonia can be removed from water by physical, biological, and chemical methods. Ozonation is effictive in the treatment of water with low concentration of ammonia. This study is undertaken to provide kinetic data for the ozonation of ammonia with or without hydrogen peroxide. The results were as follows; The destruction rate of ammonia increased gradually with the influent hydrogen peroxide concentration up to 0.23 mM and inhibited in the range of 0.23~11.4mM, and the maximum removal rate of ammonia achieved at 0.23mM of hydrogen peroxide, and the overall kinetics was first order. The combination effect of hydrogen and ozone to oxide ammonia in aqueous solution was better than ozone alone. The reacted ammonia was converted completely to nitrate ion.

• 환경위생공학
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• 제19권1호
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• pp.1-7
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• 2004

This study was conducted to supply basic informations on development of water treatment process for the ozonation of ammonia depend on pH variation with or without bromide catalysis. The results were as follows: The oxidation rate of ammonia increased depend on pH increase at ozone/bromide process. It was found that overall kinetics was zero order with respect to reaction time and reaction velocity constant of zero order increased depend on pH increase from 4.9 to 9.5 and the equation of linearization was $k_{o}$ = 0.00565 ${\times}$ [pH] + 0.0069 at ozone/bromide process. The denitrification reaction of ammonia was superior as the pH increase in the presence of bromide.

• 한국환경보건학회지
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• 제35권6호
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• pp.532-537
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• 2009

The tropospheric ozone production mechanism for the gas phase additive oxidation reaction of hydroxyl radical (OH) with isoprene (2-methyl-1,3-butadiene) has been studied using cavity ring-down spectroscopy (CRDS) at total pressure of 50 Torr and 298 K. The applicability of CRDS was confirmed by monitoring the shorter (~4%) ringdown time in the presence of hydroxyl radical than the ring-down time without the photolysis of hydrogen peroxide. The reaction rate constant, $(9.8{\pm}0.1){\times}10^{-11}molecule^{-1}cm^3s^{-1}$, for the addition of OH to isoprene is in good agreement with previous studies. In the presence of $O_2$ and NO, hydroxyl radical cycling has been monitored and the simulation using the recommended elementary reaction rate constants as the basis to OH cycling curve gives reasonable fit to the data.

• 한국토양환경학회지
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• 제5권3호
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• pp.3-15
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• 2001

본 연구에서는 증류수와 인공지하수, 그리고 지하수를 대상으로 오존의 분해거동(오존의 자가분해, pH의 영향, 용해도)과 오존산화공정에 의한 디젤의 분해(디젤의 분해, TCE와 PCE의 분해, 수산화라디칼 scavenger의 영향, pH의 영향, 오존/과산화수소의 영향)를 조사하였다. 증류수와 지하수내에서 오존의 자가분해는 모두 2차 반응속도식을 보였고, 증류수(반감기 37.5 분)에서보다 지하수(반감기 14.7분)에서 훨씬 빠르게 오존이 분해되었으며, 알칼리성 조건하에서 두 액상에서 모두 오존의 분해는 촉진되었다. 또한 오존산화공정의 사용은 TCE와 PCE, 그리고 디젤에 대해 높은 산화처리속도를 나타내었다. 비록 지하수내에 존재하는 hydroxyl radical scavenger는 디젤의 분해에서 억제제로 작용하였지만, 높은 pH조건과 과산화수소의 첨가는 지하수내에서 디젤을 분해시키는 데 중요한 촉진제로서 작용하였다. 그러므로 오존산화공정은 디젤로 오염된 지하수를 처리하는 데 효과적으로 적용될 것이라 판단된다.

• 대한화학회지
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• 제35권2호
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• pp.111-118
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• 1991

기체 상태의 오존(0.5 torr)과 이산화황간의 반응속도를 연구하였다. 이산화황은 7∼22 torr 의 압력범위에서 90∼155$^{\circ}$C의 온도영역에서 반응시켰다. 오존과 이산화황의 반응속도는 이산화탄소와의 반응보다 빨리 진행되었다. 오존과 이산화황의 반응속도식은 -d(O$_3 )/dt = k _0 (SO _2 )(M)(O _3)+2k _1(SO_2 )(O _3$)였다. 이 속도식의 첫 항은 3분자 반응으로 낮은 온도에서 우세하게 진행되었으며, 속도상수 k$_0 =(9.35{\pm}8.6){\times}10^9e^{-(11.05{\pm}2.04)kcal/RT}(M^{-2}s^{-1}$)이다. 속도식의 두번째 항은 2분자 열분해 반응으로부터 유도된 주된 반응으로 속도상수 k$_1=(1.53{\pm}1.5){\times}10^{11}e^{-22.7 kcal/RT}$이다. 전 반응차수는 주로 2차 반응이며 3차 반응과 복합반응으로 진행되었다.

• 대한화학회지
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• 제36권5호
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• pp.644-651
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• 1992

기체상태의 오존(0.5torr)과 삼산화황간의 반응속도를 연구하였다. 69∼150${\circ}C$ 온도영역에서, 삼산화황은 6∼12 torr의 압력 범위에서 반응시켰다. 오존과 삼산화황의 반응속도는 $CO_2$가 단독으로 존재하고 있을 때의 오존의 반응속도보다 더욱 빨리 진행되었다. 오존과 삼산화황의 분자 반응에 대한 명백한 증거는 발견되지 않았고 빠른 반응속도는 $O_3\;＋\;HX\;{\rightarrow}\;OH\;＋\;O_2\;＋\;X$로 시작되는 연쇄반응을 일으키게 하는 $SO_3$ 반응물에 포함된 불순물(HX) 때문인 것 같고 또한 삼산화황은 더 큰 충돌직경을 가지고 있어 그것이 오존의 열적분해를 더욱 더 빠르게 하는 이유인 것으로 사료된다. 제안된 오존과 삼산화황의 실험속도식; $[-d(O_3)/dt]\;=\;k_a(SO_3)(O_3)\;＋\;k_b(O_3)^{3/2}$과 반응속도 상수 ; $k_a(M^{-1} s^{-1})\;=\;(1.55\;{\pm}\;0.67)\;{\times}\;105\;e-{(9.270 {\pm}0.43)kcal/RT}$을 얻었다..