Performance of strong ionic hydrogels based on 2-acrylamido-2-methylpropane sulfonate as draw agents for forward osmosis

Huayong Luo, Qin Wang, Tao Tao, Tian C. Zhang, Aijiao Zhou

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

While forward osmosis (FO) has great potential to be the next generation water treatment technology, it is constrained by the development of ideal draw agents and membranes. Herein, a series of copolymerized hydrogels based on strong ionic monomer sodium 2-acrylamido-2-methylpropane sulfonate (AMPS-Na) and thermosensitive monomer N-isopropylacrylamide (NIPAM) have been synthesized and used for the first time as draw agents in the FO process. The effects of the composition of poly(NIPAM-co-AMPS-Na) [P(NIPAM-co-AMPS)] hydrogels and operational conditions including draw agent concentrations, temperature, membrane orientation, salinity of feed solution, velocity of feed solution, and running times on the FO performance have been evaluated systematically. The results demonstrate that the water flux increases with increases of the content of AMPS-Na incorporated into the hydrogel and hydrogel concentration in the draw solution, e.g., from 0.40 LMH rising up to 2.85 LMH. Besides, the water flux increases by 18% as the temperature increases from 5 to 27°C. In addition, these hydrogels remained active even after five times regeneration and reuse with a total water flux decrease of less than 5%. Furthermore, these hydrogels have negligible reverse diffusion through the FO membrane as compared with the corresponding monomer mixture and NaCl, which may avoid possible contamination on the feed solution and lower the renewable cost. All these results indicate that these synthesized P(NIPAM-co-AMPS) hydrogels are promising draw agents for the FO process.

Original languageEnglish (US)
Article number04014044
JournalJournal of Environmental Engineering (United States)
Volume140
Issue number12
DOIs
StatePublished - Dec 1 2014

Fingerprint

Osmosis
Hydrogels
sulfonate
osmosis
Monomers
Hydrogel
Fluxes
membrane
Water
Membranes
Osmosis membranes
Water treatment
water
water treatment
Contamination
regeneration
temperature
Sodium
sodium
salinity

Keywords

  • Draw agent
  • Forward osmosis
  • Strong ionic hydrogel
  • Water flux

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Environmental Chemistry
  • Environmental Science(all)

Cite this

Performance of strong ionic hydrogels based on 2-acrylamido-2-methylpropane sulfonate as draw agents for forward osmosis. / Luo, Huayong; Wang, Qin; Tao, Tao; Zhang, Tian C.; Zhou, Aijiao.

In: Journal of Environmental Engineering (United States), Vol. 140, No. 12, 04014044, 01.12.2014.

Research output: Contribution to journalArticle

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