Thin film composite hollow fiber membrane incorporated with Nf/TiO₂ for SO₂ gas separation
Thin film composite hollow fiber membrane incorporated with Nf/TiO₂ for SO₂ gas separation
- 주제(키워드) Thin film nanocomposite (TFN) hollow fiber membrane , Polyethersulfone , Nafion/TiO₂ , PEBAX-1657 , Gas separation
- 발행기관 고려대학교 대학원
- 지도교수 이기봉, 백일현
- 발행년도 2019
- 학위수여년월 2019. 2
- 유형 Text
- 학위구분 석사
- 학과 대학원 화공생명공학과
- 원문페이지 84 p
- 실제URI http://www.dcollection.net/handler/korea/000000083313
- UCI I804:11009-000000083313
- DOI 10.23186/korea.000000083313.11009.0000823
- 본문언어 영어
- 제출원본 000045978959
초록/요약
The capture of CO₂ gas from the fossil fuel-based power plants is crucial and commercially available. However, the presence of SO₂ gas in the exhaust gas streams poisons the amine solvent. In order to pretreat the exhaust gas stream and make it SO₂ free (SO₂ < 10 ppm), the use of desulfurizer units is common but expensive. In this study, we modified the surface of nanocomposite membrane with chemically stable polyethersulfone hollow fiber which shows excellent heat resistance and processability. The hollow fiber membrane was further modified by adding Nafion/TiO₂ nanoparticles with four mass concentrations(0.025, 0.050, 0.075, and 0.10 g). FTIR, SEM, TEM, EDX and AFM characterization techniques were performed to understand the morphology and structural properties of the prepared nanocomposite membranes. The gas permeation tests were performed using pure SO₂, N₂, and CO₂ gases in the pressure range of 0.5-2.5 bar at room temperature. It was found that the membrane containing 0.075 wt.% of Nafion/TiO₂ had the best performance in terms of SO₂ gas permeance and ideal selectivity. The SO₂ permeation was found to be 411–1671 GPU in the range of the studied parameters. It has been witnessed that the addition of the Nafion/TiO₂ nanoparticles introduces the sulfonic acid and hydroxyl groups to the surface of the membrane and thereby increases the hydrophilicity of the membrane. Furthermore, the SO₂ removal performance was studied using a mixed gas simulating flue gas composition (SO₂ 100 ppm, CO₂ 15%, N₂ Balance). The membrane containing 0.075 wt.% Nafion/TiO₂ particles showed 93% removal efficiency of SO₂ at a flow rate of 0.03 L/min and pressure of 3 bar, which were also found to be the optimal operating conditions.
more목차
Chapter 1. Introduction 1
1.1. Background 1
1.2. Membrane theory 5
1.3. Membrane permeability properties 7
1.4. Dissolution-diffusion model 12
1.5. Gass separation membrane mechanism 16
1.6. Meterial welection of polymer membrane 18
Chapter 2. Experimental 23
2.1. Materials 23
2.2. Fabrication of the TFN membrane and the synthesis of Nafion/TiO 23
2.3. Preparation of composite hollow fiber membrane 26
2.4. Fabrication of the membrane module 28
2.5. Characterization of the membranes 29
2.5.1. SEM analysis 29
2.5.2. TEM analysis 29
2.5.3. FTIR Spectra 29
2.5.4. AFM analysis 30
2.5.5. Water contact angle 30
2.6. Pure gas permeation tests 31
2.7. Mixed gas permeation tests 31
Chapter 3. Results and discussion 34
3.1. Characteristics of the thin film composite membrane structure 34
3.1.1. FTIR spectra analytical results 34
3.1.2. SEM image of the composite membrane 40
3.1.3. SEM-EDX analytical results 43
3.1.4. SEM-EDX mapping analytical resultsts 43
3.1.5. TEM images of Nafion/TiO 43
3.1.6. AFM analytical results 44
3.1.7. Water contact angle measurement 44
3.2. Pure gas sepration performance 51
3.3. Mixed gas separation performance 59
3.4. Effect of synthesized Nf/TiO₂ nanoparticle 66
Chapter 4. Conclusion 67
References 68
