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UV/H₂O₂, UV/TiO₂/H₂O₂, Photo-Fenton 산화방법에 의한 Citric Acid의 분해특성
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 趙舜行 | - |
| dc.contributor.author | 서민혜 | - |
| dc.date.accessioned | 2018-11-08T07:41:47Z | - |
| dc.date.available | 2018-11-08T07:41:47Z | - |
| dc.date.issued | 2005 | - |
| dc.identifier.other | 523 | - |
| dc.identifier.uri | https://dspace.ajou.ac.kr/handle/2018.oak/7176 | - |
| dc.description | 학위논문(석사)--아주대학교 대학원 :환경공학과,2005 | - |
| dc.description.abstract | 화학세정폐수에 함유되어 있는 citric acid의 효율적인 처리방안을 수립하기 위해 UV/H₂O₂, UV/TiO₂/H₂O₂, Photo-Fenton 산화방법을 이용하여 각각 citric acid의 제거효율 및 그에 따른 전력소비량을 평가하였다. 이를 위하여 실제폐수에 함유되어 있는 citric acid의 농도를 분석하고 이를 근거로 인공폐수를 조제하여 실험에 사용하였으며, 각 산화방법별로 반응에 영향을 미치는 기초인자의 변화에 따른 처리효율을 조사하여 최적 처리조건을 도출하였다. 그 결과 조사된 최적 처리조건에서 UV/H₂O₂, UV/TiO₂/H₂O₂, Photo-Fenton 산화방법을 이용한 citric acid의 제거효율은 각각 95.5%, 92.3%, 91.5%로 조사되었으며, 그에 따른 전력소비량은 11.26 kWh/㎥, 3.85 kWh/㎥, 0.799 kWh/㎥으로 조사되었다. 이 결과에 의하면 세 가지 광화학적 산화방법 모두 유기물질이 90%이상 제거되어 citric acid의 분해에 효과적인 것으로 판단되었다. 그러나 Photo-Fenton 산화방법이 다른 방법에 비해 처리에 소요되는 반응시간이 짧은 것으로 나타났다. 또한 광화학적 산화방법의 운영비를 결정짓는데 중요한 요소인 전력소모량 측면에서도 Photo-Fenton 산화방법이 다른 방법에 비해 우수한 것으로 조사되어 본 연구에서 비교하는 세 가지 방법 중 citric acid 처리에는 Photo-Fenton 방법이 효율적인 면과 경제성면에서 가장 적합한 처리기술로 결론지을 수 있었다. | - |
| dc.description.tableofcontents | 목차 표목차 = ⅰ 그림목차 = ⅲ 국문요약 = ⅵ Ⅰ. 서론 = 1 Ⅱ. 이론적 고찰 = 3 2.1. 광화학적 산화방법 (Photochemical Oxidation) = 3 2.1.1. VUV Photolysis = 6 2.1.2. UV/Oxidation Processes = 8 2.1.3. Photo-Fenton Oxidation Process = 9 2.1.4. TiO₂ Photocatalytic Oxidation Process = 12 2.2. 화학세정 = 14 2.2.1. 무기산 세정제 = 15 2.2.2. 유기산 세정제 = 15 2.2.3. 기타 착화제 = 16 Ⅲ. 실험장치 및 방법 = 17 3.1. 시료 = 17 3.2. 실험장치 = 17 3.3. 실험방법 = 19 3.3.1. UV/H₂O₂ 산화 = 19 3.3.2. TiO₂ 광촉매 산화 = 21 3.3.3. Photo-Fenton 산화 = 23 Ⅳ. 실험결과 = 25 4.1. UV/H₂O₂ 산화 = 25 4.1.1. UV 및 H₂O₂에 의한 분해특성 = 25 4.1.2. pH 변화에 따른 분해특성 = 27 4.1.3. 과산화수소 주입량의 변화에 따른 분해특성 = 33 4.1.4. UV/H₂O₂ 산화반응시 생성되는 유기산의 영향 = 36 4.2. UV/TiO₂/H₂O₂ 산화 = 38 4.2.1. pH 변화에 따른 분해특성 = 38 4.2.2. 과산화수소 주입량의 변화에 따른 분해특성 = 45 4.2.3. TiO₂ 광촉매 주입량의 변화에 따른 분해특성 = 50 4.3. Photo-Fenton 산화 = 54 4.3.1. Fe^(2+) 주입량 변화에 따른 분해특성 = 54 4.3.2. 과산화수소 주입량 변화에 따른 분해특성 = 56 4.4. 광화학적 산화방법의 전력소모량 평가(EE/O) = 58 4.4.1. UV 강도 측정 = 58 4.4.2. 전력소모량 비교 = 62 Ⅴ. 결론 = 65 참고문헌 = 67 Abstract = 73|List of Tables Table 1. Oxidation potential of several oxidants in water = 4 Table 2. Rate constants for O₃ and OH· reaction with organic compounds in Water = 5 Table 3. Experimental conditions of UV/H₂O₂ oxidation = 20 Table 4. Experimental conditions of TiO₂ photocatalytic oxidation = 22 Table 5. Experimental conditions of Photo-Fenton oxidation = 24 Table 6. Degradation characteristics of citric acid by UV/H₂O₂ oxidation at various pH = 28 Table 7. Degradation characteristics of citric acid by UV/TiO₂/H₂O₂ oxidation at various pH = 40 Table 8. Degradation characteristics of citric acid by UV/TiO₂/H₂O₂ oxidation at various H₂O₂ dosage = 47 Table 9. Degradation characteristics of citric acid by UV/TiO₂/H₂O₂ oxidation at various TiO₂ dosage = 51 Table 10. Quantum yields of ferrous production from potassium ferrioxalate = 61 Table 11. Comparison of UV/H₂O₂, UV/TiO₂/H₂O₂, Photo-Fenton oxidation at respective optimum conditions = 63|List of Figures Fig. 1. UV spectrum = 6 Fig. 2. Generally accepted mechanism of the VUV-induced oxidation = 7 Fig. 3. Scheme of chemical reaction in the photo-Fenton reaction = 11 Fig. 4. Simplified TiO₂ photocatalytic mechanism = 13 Fig. 5. Schematic diagram of photochemical oxidation reactor = 18 Fig. 6. Change of TOC removal efficiency by UV, H₂O₂, UV/H₂O₂ oxidation = 26 Fig. 7. Change of TOC removal efficiency by UV/H₂O₂ oxidation at various pH = 29 Fig. 8. Concentration profile of CO₂ in the solution by UV/H₂O₂ oxidation at various pH = 30 Fig. 9. Relationship between TOC removal and H₂O₂ consumption at various pH in the UV/H₂O₂ oxidation = 32 Fig. 10. Change of TOC removal efficiency by UV/H₂O₂ oxidation at various H₂O₂= 35 Fig. 11. Scheme of citric acid structure = 36 Fig. 12. Change of various organic acid concentration by UV/H₂O₂ oxidation for degradation of citric acid = 37 Fig. 13. Change of TOC removal efficiency by UV/TiO₂/H₂O₂ oxidation at various pH = 41 Fig. 14. Change of adsorption capacity and TOC removal efficiency by TiO₂ photocatalytic oxidation at various pH = 42 Fig. 15. Concentration profile of CO₂ in the solution a by TiO₂ photocatalytic oxidation at various pH = 43 Fig. 16. Relationship between TOC removal and H₂O₂ consumption at various pH by TiO₂ photocatalytic oxidation = 44 Fig. 17. Change of TOC removal efficiency by TiO₂ photocatalytic oxidation at various H₂O₂ dosage = 48 Fig. 18. Relationship between TOC removal and H₂O₂ consumption at various H₂O₂ dosage by TiO₂ photocatalytic oxidation = 49 Fig. 19. Change of TOC removal efficiency at 600 minute illumination with various TiO₂ dosage in TiO₂ photocatalytic oxidation = 52 Fig. 20. Relationship between TOC removal and H₂O₂ consumption at various TiO₂ dosage by TiO₂ photocatalytic oxidation = 53 Fig. 21. Change of TOC removal efficiency by photo-Fenton oxidation at various Fe^(2+) dosage = 55 Fig. 22. Change of TOC removal efficiency by photo-Fenton oxidation at various H₂O₂ dosage = 57 Fig. 23. The extinction coefficient for ferrous 1,10-phenanthroline complex = 60 Fig. 24. Change of TOC removal efficiency by three photochemical oxidation at optimum condition, respectively = 64 | - |
| dc.language.iso | kor | - |
| dc.publisher | The Graduate School, Ajou University | - |
| dc.rights | 아주대학교 논문은 저작권에 의해 보호받습니다. | - |
| dc.title | UV/H₂O₂, UV/TiO₂/H₂O₂, Photo-Fenton 산화방법에 의한 Citric Acid의 분해특성 | - |
| dc.title.alternative | Degradation Characteristics of the UV/H₂O₂ UV/TiO₂/H₂O₂ and Photo-Fenton Oxidation for Degradation of Citric Acid | - |
| dc.type | Thesis | - |
| dc.contributor.affiliation | 아주대학교 일반대학원 | - |
| dc.contributor.department | 일반대학원 공학계열 | - |
| dc.date.awarded | 2005. 2 | - |
| dc.description.degree | Master | - |
| dc.identifier.localId | 564370 | - |
| dc.identifier.url | http://dcoll.ajou.ac.kr:9080/dcollection/jsp/common/DcLoOrgPer.jsp?sItemId=000000000523 | - |
| dc.description.alternativeAbstract | To establish the efficient treatment technology of chemical cleaning wastewater from power plant, several Photo-Chemical Oxidations (UV/H₂O₂, UV/TiO₂/H₂O₂, Photo-Fenton oxidation) were investigated. Treatment efficiencies and the electrical energy requirements based on the EE/O parameter (the electrical energy required per order of pollutant removal in 1 ㎥ wastewater) were evaluated. TOC removal efficiencies by UV/H₂O₂, UV/TiO₂/H₂O₂, Photo-Fenton oxidation at the optimum conditions were 95.5%, 92.3%, 91.5%, respectively. The electrical energy requirements of UV/H₂O₂, UV/TiO₂/H₂O₂, Photo-Fenton oxidation were 11.26 kWh/㎥, 3.85 kWh/㎥, 0.799 kWh/㎥, respectively. From these results, it could be concluded that all of the three oxidation processes were effective for the degradation of citric acid. Considering the treatment efficiency and economical aspect, photo-Fenton oxidation was the most efficient treatment process among the three processes tested. | - |
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