Highly porous carbon nanotube/polysulfone nanocomposite supports for high-flux polyamide reverse osmosis membranes
- Authors
- Lee, Tae Hoon; Lee, Min Yong; Lee, Hee Dae; Roh, Ji Soo; Kim, Hyo Won; Park, Ho Bum
- Issue Date
- Oct-2017
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Reverse osmosis; Desalination; Carbon nanotube; Supports; Polymer nanocomposites
- Citation
- JOURNAL OF MEMBRANE SCIENCE, v.539, pp.441 - 450
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MEMBRANE SCIENCE
- Volume
- 539
- Start Page
- 441
- End Page
- 450
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/5373
- DOI
- 10.1016/j.memsci.2017.06.027
- ISSN
- 0376-7388
- Abstract
- Recent studies have emphasized that the surface properties of support layers in thin-film composite (TFC) membranes play a significant role in reverse osmosis (RO) performance. In this study, we used carbon nanotubes (CNTs) to tune the surface properties of microporous polysulfone membranes. The prepared CNT/PSf nanocomposite supports showed significantly improved surface porosity while maintaining both surface pore radius and hydrophobicity. Such surface characteristics resulted in the defect-free formation of a polyamide (PA) selective layer possessing a large surface area, which led to enhancement in the flux of PA-TFC membranes. PA-TFC membranes prepared with CNT/PSf nanocomposite supports showed improved water permeance up to 35% without losing salt rejection compared to the bare PA-TFC membranes. The results revealed that the surface porosity of the support is a dominant factor influencing the water permeance of TFC membranes rather than the pure water flux inside the support itself or the thickness of the PA layer. We also propose a direction for generating optimal supports through a comparison study between CNTs and hydrophilic pore formers as additives in the support material.
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