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Kinetics and degradation mechanism of Anatoxin-a during UV-C/H2O2 reaction : UV-C/H2O2 공정 중 아나톡신-a의 분해 특성과 메커니즘에 관한 연구
DC Field | Value | Language |
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dc.contributor.advisor | 조경덕 | - |
dc.contributor.author | 탁소연 | - |
dc.date.accessioned | 2017-07-19T03:12:29Z | - |
dc.date.available | 2017-07-19T03:12:29Z | - |
dc.date.issued | 2017-02 | - |
dc.identifier.other | 000000140694 | - |
dc.identifier.uri | https://hdl.handle.net/10371/128266 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 환경보건학과, 2017. 2. 조경덕. | - |
dc.description.abstract | Cyanobacteria can produce toxins which are responsible for the livestock and human poisoning. Anatoxin-a is one of the toxins mainly secreted by cyanobacteria Anabaena flos-aquae. In this study, the removals of anatoxin-a (0.3 µM) during UV-C photolysis and UV/H2O2 reactions were compared using a photo-reactor system consisting of a stirred 2-L glass bottle by applying the UV intensity of 3.5-4.0 mW/cm2 and H2O2 dose of 0.01 mM. All samples were measured after pre-treated by solid-phase extraction (SPE), followed by liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). The result showed that the removal of anatoxin-a was more effective during UV/H2O2 reaction than either UV-C photolysis or H2O2 alone. Anatoxin-a was completely degraded within 30 min during UV/H2O2 reaction, which might be due to the effective production of OH radicals. UV/H2O2 reaction of anatoxin-a resulted in an approximately 60% TOC decrease after 7 hr, and 30% acetate were produced as the organic short chain by-product. For nitrogen recovery, NH4+, NO2-, and NO3- ions were produced from UV/H2O2 reaction, and more than 50% of the total nitrogen was mineralized mainly to NO3- ion. Using LC-ESI-MS/MS, we newly identified 6 degradation by-products during UV/H2O2 reaction ([M+H]+ values of 142, 127, 113, 132, 117, and 124). Using the identified by-products, we proposed the degradation pathway of anatoxin-a during UV/H2O2 reaction based on the identified by-products. Our results imply that anatoxin-a can be effectively controlled by UV/H2O2 reaction during water treatment processes. | - |
dc.description.tableofcontents | I. Introduction 1
1.1. Anatoxin-a in the environment 1 1.2. Aanatoxin-a degradation by AOPs 5 1.3. Objectives 10 II. Materials and Methods 11 2.1. Chemicals 11 2.2. Experimental procedures 12 2.3. Solid phase extraction (SPE) procedure 15 2.4. Analytical methods 15 2.5. Identification by-products 18 III. Results and Discussion 19 3.1. Degradation kinetics of anatoxin-a during UV photolysis and UV/H2O2 reactions 19 3.2. Removal efficiencies of anatoxin-a dependent on pH during UV-C/H2O2 reaction 24 3.3. Degradation kinetics of anatoxin-a during H2O2 only, UV-C photolysis and UV-C/H2O2 reactions 27 3.4. Mineralization and identification of by-products of anatoxin-a during UV-C/H2O2 reaction 30 3.5. Formation of by-products including nitrogen by degradation of anatoxin-a during UV-C/H2O2 reaction 33 3.6. By-products identification and formation pathways during UV-C/H2O2 reaction 37 V. Conclusion 44 References 45 국문초록 56 | - |
dc.format | application/pdf | - |
dc.format.extent | 808231 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | Anatoxin-a | - |
dc.subject | UV-C photolysis | - |
dc.subject | UV/H2O2 reaction | - |
dc.subject | by-products | - |
dc.subject | degradation pathway | - |
dc.subject.ddc | 363 | - |
dc.title | Kinetics and degradation mechanism of Anatoxin-a during UV-C/H2O2 reaction | - |
dc.title.alternative | UV-C/H2O2 공정 중 아나톡신-a의 분해 특성과 메커니즘에 관한 연구 | - |
dc.type | Thesis | - |
dc.description.degree | Master | - |
dc.citation.pages | 58 | - |
dc.contributor.affiliation | 보건대학원 환경보건학과 | - |
dc.date.awarded | 2017-02 | - |
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