Mechanically and structurally robust sulfonated block copolymer membranes for water purification applications

J. Yeo, S. Y. Kim, S. Kim, Du Yeol Ryu, T. H. Kim, M. J. Park

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The effective removal of ionic pollutants from contaminated water using negatively charged nanofiltration membranes is demonstrated. Block copolymers comprising polystyrene (PS) and partially hydrogenated polyisoprene (hPI) were synthesized by varying chain architectures. A one step procedure of cross-linking (hPI blocks) and sulfonation reactions (PS chains) was then carried out, which was revealed as an effective method to enhance mechanical integrity of membranes while hydrophilic sulfonated chains remain intact. In particular, the control of chain architecture allows us to create a synergetic effect on optimizing charge densities of the membrane, water permeability, and mechanical integrity under water purification conditions. The best performing membrane can almost completely (>99%) reject various divalent cations and also show NO 3 rejection >85% and Na + rejection >87%. Well defined nanostructures (tens of nanometers) as well as the periodically arranged water domains (a few nanometers) within hydrophilic phases of the hydrated membranes were confirmed by in situ neutron scattering experiments.

Original languageEnglish
Article number245703
JournalNanotechnology
Volume23
Issue number24
DOIs
Publication statusPublished - 2012 Jun 22

Fingerprint

Block copolymers
Purification
Membranes
Polyisoprenes
Water
Polystyrenes
Water Pollutants
Nanofiltration membranes
Sulfonation
Divalent Cations
Neutron scattering
Charge density
Nanostructures
Positive ions
Experiments

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

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abstract = "The effective removal of ionic pollutants from contaminated water using negatively charged nanofiltration membranes is demonstrated. Block copolymers comprising polystyrene (PS) and partially hydrogenated polyisoprene (hPI) were synthesized by varying chain architectures. A one step procedure of cross-linking (hPI blocks) and sulfonation reactions (PS chains) was then carried out, which was revealed as an effective method to enhance mechanical integrity of membranes while hydrophilic sulfonated chains remain intact. In particular, the control of chain architecture allows us to create a synergetic effect on optimizing charge densities of the membrane, water permeability, and mechanical integrity under water purification conditions. The best performing membrane can almost completely (>99{\%}) reject various divalent cations and also show NO 3 rejection >85{\%} and Na + rejection >87{\%}. Well defined nanostructures (tens of nanometers) as well as the periodically arranged water domains (a few nanometers) within hydrophilic phases of the hydrated membranes were confirmed by in situ neutron scattering experiments.",
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Mechanically and structurally robust sulfonated block copolymer membranes for water purification applications. / Yeo, J.; Kim, S. Y.; Kim, S.; Ryu, Du Yeol; Kim, T. H.; Park, M. J.

In: Nanotechnology, Vol. 23, No. 24, 245703, 22.06.2012.

Research output: Contribution to journalArticle

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AU - Kim, S. Y.

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