A Study of HBP-g-silica Composite Reverse Osmosis Membranes
- 주제(키워드) RO membrane , HBP-g-silica , Chlorination
- 발행기관 고려대학교 대학원
- 지도교수 김성현
- 발행년도 2012
- 학위수여년월 2012. 2
- 학위구분 석사
- 학과 일반대학원 화공생명공학과
- 원문페이지 53 p
- 실제URI http://www.dcollection.net/handler/korea/000000032860
- 본문언어 영어
- 제출원본 000045698865
초록/요약
In this paper, hyper-branched aromatic polyamide grafted silica (HBP-g-silica) composite polyamide membrane was prepared to enhance the chlorination resistance of reverse osmosis (RO) membarane for desalination process. The successfully synthesized HBP-g-silica and molecular structure composition of HBP-g-silica copolymer were characterized by Fourier transform infrared (FT-IR) and thermal gravimetric analyses (TGA). The HBP-g-silica composite RO membrane was prepared through an interfacial polymerization on the polysulfone supporting film. The performance of polyamide membrane containing 2 wt% HBP-g-silica was evaluated 99% salt rejection, 13.6 L/m2h water flux with 2,000 mg/L NaCl solution at an applied pressure of 15.5 bar. After chlorination test, salt rejection was decreased only 10.9 % and water flux was increased 302%. The 2 wt. % of HBP-g-silica loading significantly modified the three dimensional polyamide (PA) network structures and contributed to high performance by the chain stiffness of the copolymer with high degree of cross-linking in RO membranes. Therefore, the HBP-g-silica that helps improve salt rejection and water permeate, also protect PA structure from degradation enhances chlorine resistance in RO membrane.
more목차
Abstract …………………………………………………………………ⅰ
Contents…………………………………………………………………ⅱ
List of figures……………………………………………………………ⅴ
List of Tables……………………………………………………………ⅶ
1. Introduction……………………………………………………………1
2. Theoretical Background…………………………………………3
2.1 TFC membrane materials……………………………………………3
2.1.1 monomer……………………………………………………3
2.1.2 additive……………………………………………………6
2.2 Chlorination of aromatic polyamides………………………………7
3. Experimental……………………………………………………10
3.1 Materials…………………………………………………………10
3.2 Synthesis of HBP-g-silica ……………………………………10
3.3 Fabrication of thin-film composite membrane…………………11
3.4 Membrane performance evaluation………………………………14
3.5 Characterization…………………………………………15
4. Results and Discussion…………………………………………16
4.1 Synthesis and characterization of HBP-g-silica....……………16
4.1.1 FT-IR spectra of HBP-g-silica………………………………16
4.1.2 TGA analysis of HBP-g-silica………………………………18
4.2 Properties of membrane…………………………………………20
4.2.1 FT-IR spectra of membranes………………………………20
4.2.2 TGA analysis of membranes………………………………22
4.2.3 Hydrophilicity of membranes………………………………24
4.2.4 Membrane surface structure…………………………………26
4.3 Performance of membrane………………………………………28
4.3.1 Effect HBP-g-silica on performance of RO membrane……28
4.3.2 HBP-g-silica concentration optimization.…………………32
5. Conclusion …………………………………………………………36
Abbreviation………………………………………………………………37
References………………………………………………………………38
Acknowledgement……………………………………………………42
