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Development of High-flux and Anti-fouling Polyamide Thin-film Nanocomposite RO/PRO Membrane through Coating and Embedding of TiO2 Nanomaterials
타이타니아 나노물질의 코팅 및 첨가를 통한 고투과, 내오염성의 역삼투, 압력지연삼투 폴리아마이드 나노복합막 개발

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dc.contributor.advisor윤제용-
dc.contributor.author김정찬-
dc.date.accessioned2017-07-13T08:44:57Z-
dc.date.available2017-07-13T08:44:57Z-
dc.date.issued2016-08-
dc.identifier.other000000136727-
dc.identifier.urihttps://hdl.handle.net/10371/119807-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 화학생물공학부, 2016. 8. 윤제용.-
dc.description.abstractIn this dissertation, development of high performance and fouling resistant PA TFC membrane was implemented by coating and embedding of TiO2 nanomaterial for RO and PRO applications.
Firstly, the surface of PA TFC membrane was coated with TiO2 nanoparticles (TNPs) via a sol-gel-derived spray coating method. The optimum TiO2 nanoparticle coating layer, which is dense and durable without blocking the pore or surface, was formed by base-catalyzed (ammonium hydroxide) TiO2 sol-gel-derived spray coating. Through this optimized coating condition, the active and support layer of a commercial TFC was coated with TiO2 nanoparticles (TNPs) for RO and PRO application, respectively. This TNP coating imparted hydrophilic properties and a negative charge to the membrane surface. These modified surface properties reduced the interaction force between humic acid and membrane surface and resulted in the enhancement of fouling resistance in RO and PRO process. The less favorable foulant-membrane interaction of the TNP-coated membrane was confirmed by a lower interaction force between a humic acid-tethered AFM tip and the membrane surface. A TNP coating of support layer increased water flux and reduced reverse salt flux in PRO process, while water flux and salt rejection were maintained when the proper amounts of TiO2 sol was coated in RO process.
Secondly, TiO2 nanomaterials embedded polyamide thin-film nanocomposite membrane was fabricated for enhancement of water flux and fouling resistance. In addition, the effect of structure and surface property of nanomaterial on water flux was evaluated by comparison of TiO2 nanotube (TNT) and TiO2 nanoparticle (TNP) embedded PA TFN membrane. The TFN RO membranes containing TNT or TNP exhibited similarly high hydrophilicities and enhanced water permeability compared with a conventional RO membrane. Although TNP TFN RO membrane has similar surface hydrophilicity with TNT TFN RO membrane when the same amount of TNP and TNT are embedded, the TNT TFN RO membranes had better water permeability than the TNP TFN RO membranes. Compared with non-porous TNP, nanochannels of TNT provided additional enhanced water permeability by serving as water transport passageways.
From these results, it is expected that the addition of TiO2 nanomaterials in PA TFC membrane can enhance the performance and fouling resistance in RO and PRO process.
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dc.description.tableofcontents1. Introduction 1
1.1. Research background 1
1.2. Objectives 5

2. Literature review 7
2.1. Membrane fouling and surface property of antifouling membrane 7
2.2. Surface modification of membrane 12
2.3. Nanomaterial coated and embedded membranes 19

3. TiO2 nanoparticle coating on PA membrane for PRO, RO application via sol-gel derived spray coating method 30
3.1. Research background and strategies for finding an optimum condition of TiO2 sol-gel derived spray coating 30
3.1.1. TiO2 coating via conventional sol-gel derived spray coating 32
3.1.2. Strategies for finding an optimum condition of TiO2 sol-gel derived spray coating method 38
3.2. A high-performance and fouling resistant thin-film composite membrane prepared via coating TiO2 on a support layer by the sol-gel-derived spray method for pressure retarded osmosis applications 58
3.2.1. Introduction 58
3.2.2. Materials and methods 60
3.2.3. Results and discussion 70
3.3. Facile surface modification of PA TFC RO membrane using TiO2 sol-gel derived spray coating method to enhance anti-fouling property 94
3.3.1. Introduction 94
3.3.2. Materials and methods 96
3.3.3. Results and discussion 100
3.4. Summary 114

4. Evaluation of thin-film nanocomposite reverse osmosis membranes using TiO2 nanotubes and TiO2 nanoparticles 115
4.1. Introduction 115
4.2. Materials and methods 119
4.2.1. Synthesis of TiO2 nanotube 119
4.2.2. Characterization of TiO2 nanotube and TiO2 nanoparticle 120
4.2.3. Fabrication of TiO2 nanotube and TiO2 nanoparticle embedded thin-film nanocomposite membrane 121
4.2.4. Characterization of TiO2 nanotube and TiO2 nanoparticle embedded thin-film nanocomposite membrane 123
4.2.5. Membrane performance test 124
4.3. Results and discussion 126
4.3.1. Characteristics of TiO2 nanotube and TiO2 nanoparticle 126
4.3.2. Characteristics of TiO2 nanotube and TiO2 nanoparticle embedded thin-film nanocomposite membrane 128
4.3.3. Performance of TiO2 nanotube and TiO2 nanoparticle embedded thin-film nanocomposite membrane 133
4.4. Summary 139

5. Conclusions 140

References 142

국문 초록 161
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dc.formatapplication/pdf-
dc.format.extent6654789 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subject타이타니아 졸-겔 스프레이 코팅-
dc.subject표면 개질-
dc.subject타이타니아 나노튜브 나노복합막-
dc.subject압력지연삼투공정-
dc.subject역삼투공정-
dc.subject.ddc660-
dc.titleDevelopment of High-flux and Anti-fouling Polyamide Thin-film Nanocomposite RO/PRO Membrane through Coating and Embedding of TiO2 Nanomaterials-
dc.title.alternative타이타니아 나노물질의 코팅 및 첨가를 통한 고투과, 내오염성의 역삼투, 압력지연삼투 폴리아마이드 나노복합막 개발-
dc.typeThesis-
dc.contributor.AlternativeAuthorJungchan Kim-
dc.description.degreeDoctor-
dc.citation.pages163-
dc.contributor.affiliation공과대학 화학생물공학부-
dc.date.awarded2016-08-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Theses (Ph.D. / Sc.D._화학생물공학부)
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