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초음파 (US)와 다양한 파장범위의 자외선 (UV) 조사에 따른 DEP 분해특성에 관한 연구
나승민 ( Seung Min Na ),( Jin Hua Cai ),신동훈 ( Dong Hoon Shin ),( Ming Can Cui ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.7
Diethyl phthalate (DEP) is widely spread in the natural environment as an endocrine disruption chemicals (EDs). Therefore, in this study, ultrasound (US) and ultraviolet (UVC), including various applied power density (10-40 W/L), UV wavelengths (365 nm, 254 nm and 185 nm) and frequencies (283 kHz, 935 kHz) were applied to a DEP contaminated solution. The pseudo-first order degradation rate constants were in the order of 10-1 to 10-4 min-1 depending on the processes. Photolytic and sonophotolytic DEP degradation rate also were high at shortest UV wavelength (VUV) due to the higher energy of photons, higher molar absorption coefficient of DEP and increased hydroxyl radical generation from homolysis of water. Sonolytic DEP degradation rate increased with increase of applied input power and the dominant reaction mechanism of DEP in sonolysis was estimated as hydroxyl radical reaction by the addition of t-BuOH, which is a common hydroxyl radical scavenger. Moreover, synergistic effect of were also observed for sonophotolytic degradation with various UV irradiation.
파 에너지 (자외선, 초음파)/과황산나트륨을 이용한 이부프로펜 분해특성 연구
나승민 ( Seung Min Na ),안윤경 ( Yungyong Ahn ),손영규 ( Ming Can Cui ),김지형 ( Young Gu Son ),( Jeeh Yeong Kim ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.5
In this study, ibuprofen(IBP) degradation by the photochemical (UV/S2O82-) and sonochemical (US/S2O82-) processes was examined under various parameters, such as UV (10~40±5 W/L) and US (50~90±5 W/L) power density, optimum dosage of persulfate ion (S2O82-), temperature (20~60℃) and anions effect (Cl-, HCO3-, CO32-). The pseudo?first?order degradation rate constants were in the order of 10-1 to 10-5 min-1 depending on each processes. The synergistic effect of IBP degradation in UV/S2O82- and US/S2O82- processes could investigated, due to the generation of SO4- radical. This result can confirm from the produced H2O2 and SO42- concentration in each processes. IBP degradation rate affected by the S2O82- dosage, temperature, power and anion existence parameters. In particular, IBP degradation rate increased with the increase of the temperature (60℃) and applied power density (UV:40±5 W/L, US:90±5 W/L). On the other hand, anions effect on the IBP degradation was negative, due to the anion play as a the scavenger of radical.
채금화 ( Jin Hua Cai ),나승민 ( Seung Min Na ),안윤경 ( Yun Gyong Ahn ),이세반 ( Se Ban Lee ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.4
In this study, Ibuprofen (IBP) degradation by the photo catalytic process was investigated under various parameters, such as UV intensity, optimum dosage of TiO2, alkalinity, temperature and pH of bulk solution. The pseudo-first order degradation rate constants were in the order of 10-1 to 10-4 min-1 depending on each condition. The Photocatalytic IBP degradation rate increased with an increase in the applied UV power. At high UV intensity a high rate of tri-iodide (I3 -) ion formation was also observed. Moreover, in order to avoid the use of an excess catalyst, the optimum dosage of catalyst under the various UV intensities (30 and 40 W/L) was examined and ranged from approximately 0.1 gL-1. The photo catalytic IBP degradation rate was changed depending on the alkalinity and temperature and pH in the aqueous solution. This study demonstrated the potential of photo catalytic IBP degradation under different conditions.
혼합된 고급산화공정(AOPs)을 이용한 내분비계장애물질(DEP, NP)의 분해특성 연구
나승민 ( Seung Min Na ),안윤경 ( Yung Yong Ahn ),최명찬 ( Ming Can Cui ),조상현 ( Sang Hyun Cho ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.2
Diethyl phthalate (DEP) and nonylphenol (NP) are widely spread in the natural environment as an endocrine disruption chemicals (EDs). Therefore, in this study, ultrasound (US) and ultraviolet (UVC), including TiO2, as advanced oxidation processes (AOPs) were applied to a DEP and NP contaminated solution. When only the application of US, the optimum frequency for significant DEP degradation and a high rate of hydrogen peroxide (H2O2) formation was 283 kHz. We know that the main mechanism of DEP degradation is radical reaction and, NP can be affected by both of radical reaction and pyrolysis through only US (sonolysis) process and combined US+UVC (sonophotolysis) process. At combined AOPs (sonophotolysis/sonophotocatalysis) such as US+UVC and US+UVC+TiO2, significant degradation of DEP and NP were observed. Enhancement effect of sonophotolysis and sonophotocatalysis system of DEP and NP were 1.68/1.38 and 0.99/1.17, respectively. From these results, combined sonophotocatalytic process could be more efficient system to obtain a significant DEP and NP degradation.