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Freestanding self-assembled sulfonated pentablock terpolymer membranes for high flux pervaporation desalination

Journal Article · · Journal of Membrane Science
 [1];  [2];  [3];  [3];  [3];  [4];  [3];  [3];  [2]
  1. Arizona State Univ., Tempe, AZ (United States); Rice Univ., Houston, TX (United States); Arizona State University
  2. Rice Univ., Houston, TX (United States)
  3. Arizona State Univ., Tempe, AZ (United States); Rice Univ., Houston, TX (United States)
  4. Univ. of Texas, El Paso, TX (United States); Rice Univ., Houston, TX (United States)
Pervaporation desalination has several advantages over competing desalination technologies, most notably an ability to select for or against volatile organic compounds and the ability to process high salinity feeds at a low transmembrane pressure. Pervaporation has not been commercialized for desalination applications because of its energy intensity. However, emerging processes such as hydraulic fracturing produce high total dissolved solids (>30-45 g/L) byproduct streams that exceed the operational limits of traditional reverse osmosis and could be treated by pervaporation. Here, we demonstrate free-standing pervaporation membranes with excellent permeance and high salt removal based on a partially sulfonated pentablock terpolymer with the tradename Nexar™. Pervaporation membranes were easily cast from this material with desalination performances comparable or superior to commercially available membranes. We found that the polymer degree of sulfonation and casting solvent polarity had a significant impact on the membranes’ water uptake but only a modest impact on the pervaporation desalination performance. Membranes with a degree of sulfonation of 52% (2.0 meq g–1 IEC) and a casting solution composed of 50 wt% n-propanol and 50 wt% toluene achieved a water flux of 3.32 kg m-2 h-1 (permeance 135 kg m-2 h-1 bar-1) with 99.5% salt removal in pervaporation from a 32 g/L–1 sodium chloride feed solution at room temperature. We demonstrated that dense, non-porous NexarTM pervaporation membrane permeance and salt separation performance were superior to commercial pervaporation membranes and equivalent to commercial membrane distillation membranes, which have much larger pores. Here, this study demonstrates that commercially available sulfonated pentablock terpolymers are excellent membranes for pervaporation desalination because of their ease of casting and excellent performance.
Research Organization:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Organization:
NSF; USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0001103
OSTI ID:
1638929
Alternate ID(s):
OSTI ID: 1646519
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 613; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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