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TiO2 광촉매 공정을 이용한 Enrofloxacin의 분해 특성

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Alternative Title
Degradation Characteristics of Enrofloxacin Using TiO2 Photocatalytic Process
Abstract
Photocatalytic degradation characteristics of enrofloxacin, which is one offluoroquinolones widely used in humans and veterinary medicines, using UVreactor with installed TiO2-coated screw type sheet, were investigated. TheUV reactor was also equipped with 4 ozone UV lamps (UV254+185 nm), takingthe light intensity of 63 ㎼/㎠ for each lamp, In addition, effects ofindependent variables affecting photocatalytic degradation of enrofloxacin andoptimal conditions for its removal were also studied, using response surfacemethodology (RSM).Removal efficiencies of enrofloxacin were increased with the increase oflight intensity in the range of 63 ~ 252 ㎼/㎠, and were similar in theconcentrations of 1 ~ 10 mg/L, but decreased greatly at 20 mg/L in theeffect of initial enrofloxacin concentrations. They decreased in the order of pH7 > pH 5 > pH 9 in the effect of pH, decreased with increasing NaClconcentrations in the range of 10 ~ 30 ‰ in the effect of NaClconcentrations, and increased with increasing up to 25 mM, but decreased at50 mM in the effect of H2O2 concentrations.The RSM-central composite design was applied as the method of statisticalanalysis through experiments, and the major independent variables applied fortreated concentration and removal efficiency of enrofloxacin, were UVintensity (㎼/㎠), initial concentration (mg/L), H2O2 concentration added(mg/L), and reaction time (min). With the results of multiple regressionanalysis, the difference in confidence intervals in which each independentvariable depends on the experimental value and predicted value for treatedconcentration and removal efficiency of enrofloxacin, with high correlation ofdetermination coefficient 96.2% and 89.7%, respectively, indicating thatphotocatalytic reaction used in this study directly affected its removalefficiency and independent variable was affected each other.When drwing a contour plot between variables and response, UV lightintensity of 126 ㎼/㎠, initial enrofloxacin concentration of 10 mg/L, reactiontime of 120 min and concentration of H2O2 concentration of 25 mM were setto a fixed value and the remaining variables were analyzed. The removalefficiencies of 99% were obtained under the conditions of UV light intensityof above 200 ㎼/㎠, lower enrofloxacin concentration, reaction time of above120 min, and H2O2 concentration of 25 mM, through the interaction ofindependent variable with all fixed values. For H2O2 concentration added, itsremoval efficiency was increased up to 25 mM, but decreased above 25 mM.Finally, a satisfactory operating parameters were derived from photocatalyticdecomposition process used in this study using response optimization in RSM.From this results, optimal removal efficiency of above 94% could be obtainedunder the conditions of UV light intensity of above 200 ㎼/㎠, reaction timeof 165 min, H2O2 concentration of 10 mM, when operating at initialconcentration of 10 mg/L.
Author(s)
이민정
Issued Date
2021
Awarded Date
2021. 2
Type
Dissertation
URI
https://oak.jejunu.ac.kr/handle/2020.oak/23508
Alternative Author(s)
Lee, Min Jeong
Affiliation
제주대학교 대학원
Department
대학원 환경공학과
Advisor
감상규
Table Of Contents
Ⅰ. 서 론 1
Ⅱ. 이론적 고찰 4
1. Enrofloxacin 4
1) Enrofloxacin의 특성 4
2) Enrofloxacin의 환경 중 농도 5
2. 항생제의 처리기술 7
1) 처리기술의 현황 7
2) UV 광촉매 기술 10
3. 반응표면분석법(RSM, Response Surface Methodology) 14
1) 실험계획법 14
2) 반응표면분석-중심합성계획법 15
3) ANOVA(analysis of Variance) - 분산분석 16
Ⅲ. 실험재료 및 방법 17
1. 실험재료 17
2. 실험장치 18
1) 실험장치의 구성 18
2) UV 광촉매 반응기 19
3. 실험방법 21
Ⅳ. 실험 결과 및 고찰 23
1. Enrofloxacin의 UV 광촉매 분해 23
1) TiO2 광촉매 코팅의 영향 23
2) UV 광세기(/)의 영향 26
3) Enrofloxacin 초기 농도의 영향 28
4) pH의 영향 30
5) 염분농도의 영향 32
6) H2O2의 첨가량의 영향 34
2. 통계해석을 통한 Enrofloxacin의 결과 해석 36
1) 영향인자간의 반응모델 해석 36
2) Enrofloxacin의 제거효율 반응모델 해석 40
3) 변수와 반응사이의 등고선도(Contour Plot) 43
4) 반응 최적화를 통한 결과해석 47
Ⅴ. 결론 48
참고문헌 50
Degree
Master
Publisher
제주대학교 대학원
Citation
이민정. (2021). TiO2 광촉매 공정을 이용한 Enrofloxacin의 분해 특성
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General Graduate School > Environmental Engineering
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