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Development of Novel Hybrid Adsorbents of Strong Base Anion Exchange Resin and Inorganic Nanoparticles for Selective Removal of Phosphate and Arsenic from Water : 인산과 비소의 선택적 흡착을 위한 새로운 강염기 음이온 교환수지와 무기 나노 입자 복합 흡착제 개발

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dc.contributor.advisorJeyong Yoon-
dc.contributor.author부이후트렁-
dc.date.accessioned2018-05-28T16:29:33Z-
dc.date.available2018-05-28T16:29:33Z-
dc.date.issued2018-02-
dc.identifier.other000000149902-
dc.identifier.urihttps://hdl.handle.net/10371/140745-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 공과대학 화학생물공학부, 2018. 2. Jeyong Yoon.-
dc.description.abstractDevelopment of selective adsorbents with an enhanced removal efficiency for the removal of phosphate and arsenic from water/wastewater is urgently needed to obtain safe water. Firstly, a hybrid adsorbent of nanoscale zirconium molybdate embedded within a macroporous anion exchange resin (ZMAE) was fabricated for selective removal of phosphate and arsenate. The ZMAE was characterized with low agglomeration of zirconium molybdate (ZM) NPs dispersed within the structure of the anion exchange resin (AE). As major results, the adsorption capacity of ZMAE for both phosphate and arsenate (26.1 mg-P/g and 46.7 mg-As/g, respectively) in the presence of excessive sulfate (5 mM) showed much superior to that of the pristine AE (1.8 mg-P/g and 6.9 mg-As/g, respectively) although their capacities were similar in the absence of sulfate. This selective performance of the ZMAE for both phosphate and arsenate in the presence of excess sulfate ion is attributed by the role of loaded ZM NPs which contributed to be more than 90% of the selective capacities of the ZMAE. Furthermore, the selective phosphate and arsenate of the ZMAE was confirmed by not only the batch experiment with synthetic model water/wastewater but also the column test.
Secondly, this study proposed a new and effective method for fabricating a hydrated zirconium oxide NPs embedded anion exchange resin (ZAE) in purpose of development a robust and high selective adsorbent for phosphate removal. This proposed method achieved much more effective loading Zr within the resin than the conventional method. A series of the ZAE adsorbents with different Zr contents were fabricated and examined the selective adsorption of phosphate. As major results, the HZO NPs contributed to enhance both adsorption efficiency and selectivity of the anion exchange resin (AE). The selective adsorption of the ZAE for phosphate ion relied on the loaded HZO NPs and was in a function of the Zr content. Indeed, linear equation with high coefficient R2 value (R2  1.00) well described for the correlation between the Zr content and the maximum capacity of effective phosphate adsorption for either batch or column adsorption. These results allow to understand the selective insights of the ZAE toward phosphate ion.
In overall, both hybrids ZMAE and ZAE promise a great potential for effective removal of phosphate and arsenic in real water/wastewater treatment. These could allow to explore a new route for synthesis of low cost and novel hybrid adsorbents for phosphate and arsenic.		-
dc.description.tableofcontents1. Introduction 1
1.1. Research background 1
1.2. Objectives 5
2. Literature Review 7
2.1. Arsenic and phosphate problems 7
2.1.1. Arsenic and its contamination in water 7
2.1.2. Eutrophication and its relationship with phosphate 10
2.2. Adsorption technology for arsenic and phosphate removal 13
2.2.1. Overview 13
2.2.2. Ion exchangers for anion removal 17
2.2.2.1. Introduction 17
2.2.2.2. Mechanism and non-selectivity of anion exchangers 20
2.2.3. Adsorption by metal oxides and their limitations 23
2.2.4. Adsorption by molybdate-based materials 27
2.2.5. Hybrid Inorganic NPs embedded anion exchanger 28
2.2.5.1. Principle of Donnan membrane equilibrium of anion exchanger 30
2.2.5.2. Synthesis of inorganic NPs embedded anion exchanger 35
3. Development of nano-scale zirconium molybdate embedded anion exchange resin (ZMAE) for selective removal of phosphate an arsenic 47
3.1. Synthesis of the ZMAE 47
3.1.1. Materials and methods 47
3.1.1.1. Chemicals 47
3.1.1.2. Synthesis of the ZMAE adsorbent 47
3.1.1.3. Analytical methods 48
3.1.2. Characterizations of the ZMAE 50
3.2. Study of selective phosphate adsorption on the ZMAE 54
3.2.1. Experiments and methods 54
3.2.1.1. Phosphate analysis 54
3.2.1.2. Batch adsorption 54
3.2.1.3. Determination of selectivity coefficient of ZMAE 55
3.2.1.4. Quantitative determination of the phosphate selectivity of the ZMAE 56
3.2.1.5. Stability study of the ZMAE 58
3.2.1.6. Application of the ZMAE to Synthetic Water 58
3.2.2. Results and discussion 60
3.2.2.1. Selective phosphate adsorption of the ZMAE 60
3.2.2.2. Interpretation of the phosphate selectivity of the ZMAE 70
3.2.2.3. Effect of pH to the stability and phosphate adsorption of ZMAE 73
3.2.2.4. Application of the ZMAE for phosphate removal in synthetic water 76
3.2.3. Conclusion 78
3.3. Study of selective arsenic adsorption on the ZMAE 79
3.3.1. Experiments and methods 79
3.3.1.1. Synthesis of the ZMAE adsorbent 79
3.3.1.2. Analytical method 79
3.3.1.3. Batch adsorption experiments 80
3.3.1.4. Interpretation procedure of the selective arsenic adsorption of the ZMAE 81
3.3.1.5. Fixed-bed column experiments 81
3.3.2. Results and discussion 82
3.3.2.1. Enhanced arsenic adsorption of the ZMAE 82
3.3.2.2. Interpretation of the arsenic selectivity of the ZMAE 92
3.3.2.3. Effect of pH to the arsenic adsorption 94
3.3.2.4. Fixed-bed column adsorption 96
3.3.3. Conclusion 98
4. Synthesis of Hydrated Zirconium Oxide Embedded Anion Exchange Resin for Selective Removal of Phosphate 99
4.1. Introduction 99
4.2. Experiments 101
4.2.1. Materials and Chemicals 101
4.2.2. Preparation of ZAE 101
4.2.3. Analytical methods 102
4.2.4. Batch adsorption experiments 102
4.2.5. Fixed-Bed column experiments 103
4.3. Results and discussions 104
4.3.1. Characteristics of the ZAE 104
4.3.2. Phosphate adsorption: the role of Zr content 108
4.3.2.1. Selective adsorption of phosphate 108
4.3.2.2. Isotherm adsorption study 112
4.3.2.3. Fixed-bed column test 116
4.3.3. Interpretation of selective removal of phosphate 119
4.4. Conclusion 122
5. Conclusion 123
Supplementary data 125
References 136		-
dc.formatapplication/pdf-
dc.format.extent2646651 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjecthydrated zirconium oxide-
dc.subjectphosphate removal-
dc.subjectarsenic removal-
dc.subjectanion exchange resin-
dc.subjecthybrid adsorbent-
dc.subjectSelective adsorption-
dc.subjectzirconium molybdate-
dc.subject.ddc660.6-
dc.titleDevelopment of Novel Hybrid Adsorbents of Strong Base Anion Exchange Resin and Inorganic Nanoparticles for Selective Removal of Phosphate and Arsenic from Water-
dc.title.alternative인산과 비소의 선택적 흡착을 위한 새로운 강염기 음이온 교환수지와 무기 나노 입자 복합 흡착제 개발-
dc.typeThesis-
dc.contributor.AlternativeAuthorBUI HUU TRUNG-
dc.description.degreeDoctor-
dc.contributor.affiliation공과대학 화학생물공학부-
dc.date.awarded2018-02-
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