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바이오차와 유기 및 무기 오염물질 간의 흡착 기작 해석
Interpreting the Sorption Mechanisms of Biochar with Organic and Inorganic Pollutants

DC Field Value Language
dc.contributor.advisor노희명-
dc.contributor.author이서연-
dc.date.accessioned2020-10-13T03:10:18Z-
dc.date.available2020-10-13T03:10:18Z-
dc.date.issued2020-
dc.identifier.other000000162721-
dc.identifier.urihttps://hdl.handle.net/10371/169632-
dc.identifier.urihttp://dcollection.snu.ac.kr/common/orgView/000000162721ko_KR
dc.description학위논문 (박사) -- 서울대학교 대학원 : 농업생명과학대학 농생명공학부, 2020. 8. 노희명.-
dc.description.abstractBiochar is a carbonaceous material produced from various feedstocks through pyrolysis, and it has received great attention as an eco-friendly biosorbent because of its considerable sorption capacity for pollutants. Pyrolysis and environmental conditions determine the physicochemical characteristics of biochar and the sorption behavior of pollutants; however, the complex interaction between biochar and pollutants has not yet been comprehensively examined. Therefore, in this study, a literature review regarding the physicochemical characteristics of biochar based on pyrolysis conditions and the sorption of pollutants to biochar were conducted, and laboratory experiments using sorption isotherm with spectroscopy analysis were performed to elucidate and interpret the sorption mechanisms of organic simazine, cationic cadmium and anionic arsenate to Miscanthus biochar by changing pyrolysis temperature, pH and background electrolytes. The results indicated that electron donor-acceptor and hydrophobic interactions were the main sorption mechanisms for simazine, and calcium as the background electrolyte showed pore-filling effects by decreasing the sorption capacity compared with sodium. The sorption mechanisms of cadmium and arsenate were identified as partitioning and an outer-sphere complexation. Additionally, an inner-sphere complexation and precipitation were confirmed for cadmium, and an electrostatic cation bridging complexation and hydrophobic interaction were confirmed for arsenate. During sorption with biochar, reduced arsenate species was found. The pH and pyrolysis temperature did not show a general pattern with regard to the sorption of pollutants. The sorption of simazine decreased with increasing pH, while the opposite pattern was observed for cadmium and arsenate. An increased pyrolysis temperature reduced the sorption of simazine, but the observed trend was inconsistent for cadmium and arsenate. Based on the observations, different pyrolysis temperature and environmental conditions led to distinct sorption patterns between biochar and pollutants because various sorption mechanisms are involved in the sorption process, and the dominant sorption mechanism varies with environmental conditions. Changes in pyrolysis temperature and environmental conditions dominantly affected leachability, bioavailability and toxicity of pollutants; thus, it is essential to comprehensively understand the fundamental interactions among the physicochemical characteristics of biochar, behavior of pollutants and environmental conditions before the utilization of biochar as a biosorbent.-
dc.description.abstract바이오차는 다양한 농산업 부산물의 열분해 과정에서 생산된 탄소질 물질로, 뛰어난 오염물질 흡착량 때문에 친환경적인 생물 흡착제로 많은 주목을 받고 있다. 열분해와 환경 조건은 바이오차의 물리화학적 특성과 오염물질의 흡착 거동을 결정하지만, 바이오차와 오염물질 간의 복잡한 상호작용을 포괄적으로 이해하기 위한 연구는 부족한 실정이다. 따라서, 이 연구는 바이오차의 열분해 조건에 따른 물리화학적 특성과 오염물질 흡착에 대하여 문헌 조사를 수행하였고, 오염물질 흡착 기작을 설명하기 위해 열분해 조건, pH, 바탕 전해질의 이온 원자가 변화에 따른 거대 억새 바이오차의 시마진, 카드뮴, 비산염의 흡착 실험을 수행하였다. 그 결과, 바이오차의 시마진 흡착에 electron donor-acceptor와 hydrophobic interaction이 주요하게 작용하였고, 바탕 전해질 용액의 양이온은 바이오차에 공극 막힘 효과를 유발하여 시마진 흡착량 감소 효과는 나트륨에 비하에 칼슘이 더 컸다. 카드뮴과 비산염의 흡착 기작에 partitioning과 outer-sphere complexation이 공통으로 확인되었으며, 카드뮴의 경우 흡착에 inner-sphere complexation과 precipitation이, 비산염의 경우 cation bridging complexation과 hydrophobic interaction 작용하였다. 특히 흡착과정에서 바이오차에 의해 환원된 비산염 화학종이 확인되었다. pH와 열분해 온도에 따른 바이오차의 오염물질 흡착은 일반적인 경향을 보이지 않았다. 시마진 흡착량은 pH가 증가할수록 감소하였으나, 카드뮴과 비산염은 반대였다. 열분해 온도가 높을수록 시마진의 흡착량은 감소하였으나, 카드뮴과 비산염의 흡착은 일정한 결과가 없었다. 이러한 연구 결과들을 바탕으로, 열분해 온도와 환경 조건의 변화가 바이오차와 오염물질과의 독특한 상호작용을 일으켰고, 이는 바이오차와 오염물질 사이에 다양한 흡착 기작이 존재하며 주요 흡착 기작이 환경 조건에 따라 변하여 오염물질의 용출도, 생물 유효도, 독성에 영향을 주었다는 것을 밝혔다. 따라서, 본 연구는 바이오차를 실제 환경에서 생물 흡착제로 사용하기 전에 바이오차의 물리화학적 특성, 오염물질의 특성, 환경 조건 간의 기본적인 상호작용을 이해하는 것은 필수적이라는 것을 제시하였다.-
dc.description.tableofcontentsCHAPTER 1. GENERAL INTRODUCTION 21
1.1. Definition of biochar 21
1.2. Biochar for environmental prospects 22
1.3. Ionizable pollutants in the environments 25
1.4. Identification of sorption mechanism 30
1.5. Aims of dissertation 31
Reference 35
CHAPTER 2. LITERATURE REVIEW 42
List of contents 42
Abstract 43
2.1. Introcution 44
2.2. Physicochemical characteristics of biochar 47
2.3. Biochar as universal sorbent 61
2.4. Unexpected results in remediation of pollutatns 68
2.5. Conclusions 72
Reference 73
CHPATER 3. INTERPRETING THE pH-DEPENDENT MECHANISM OF SIMAZINE SORPTION TO MISCANTHUS BIOCHAR PRODUCED AT DIFFERENT PYROLYSIS TEMPERATURES FOR ITS APPLICATION TO SOIL 82
List of contents 82
Abstract 83
3.1. Introduction 84
3.2. Materials and methods 86
3.3. Results and discussion 94
3.4. Conclusions 118
Reference 120
CHPTER 4. INTERACTIVE EFFECT OF pH AND CATION VALENCE IN BACKGROUND ELECTROLYTE SOLUTIONS ON SIMAZINE SORPTION TO MISCANTHUS BIOCHAR PRODUCED AT TWO DIFFERENT PYROLYSIS TEMPERATURES 128
List of contents 128
Abstract 129
4.1. Introduction 130
4.2. Materials and methods 133
4.3. Results and discussion 139
4.4. Conclusions 159
Reference 161
CHAPTER 5. COMPREHENSIVE INTERPRETATION FOR THE SORPTION MECHANISMS OF Cd2+ AND As(V) ON MISCANTHUS BIOCHAR USING SCANNING ELECTRON MICROSCOY, X-RAY DIFFRACTION AND PHOTOEMISSION SPECTROSCOPY 168
List of contents 168
Abstract 169
5.1. Introduction 170
5.2. Materials and methods 172
5.3. Results and discussion 176
5.4. Conclusions 222
Reference 224
CHAPTER 6. SUMMARY AND CONCLUSIONS 228
6.1. Summary 228
6.2. Conclusions 232
ABSTRACT IN KOREAN 240
LIST OF PUBLICATION 243
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dc.language.isoeng-
dc.publisher서울대학교 대학원-
dc.subject바이오차-
dc.subject열분해 온도-
dc.subject흡착 기작-
dc.subjectpH-의존-
dc.subject전해질 원자가 효과-
dc.subject시마진-
dc.subject카드뮴-
dc.subject비산염-
dc.subjectBiochar-
dc.subjectPyrolysis temperature-
dc.subjectSorption mechanism-
dc.subjectpH-dependent-
dc.subjectElectrolyte solution-
dc.subjectSimazine-
dc.subjectCadmium-
dc.subjectArsenate-
dc.subject.ddc630-
dc.title바이오차와 유기 및 무기 오염물질 간의 흡착 기작 해석-
dc.title.alternativeInterpreting the Sorption Mechanisms of Biochar with Organic and Inorganic Pollutants-
dc.typeThesis-
dc.typeDissertation-
dc.contributor.AlternativeAuthorLee, Seoyeon-
dc.contributor.department농업생명과학대학 농생명공학부-
dc.description.degreeDoctor-
dc.date.awarded2020-08-
dc.contributor.major응용생명화학전공-
dc.identifier.uciI804:11032-000000162721-
dc.identifier.holdings000000000043▲000000000048▲000000162721▲-
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Agricultural Biotechnology (농생명공학부)Theses (Ph.D. / Sc.D._농생명공학부)
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