Hydrophobic polydimethylsiloxane thin-film composite membranes for the efficient pervaporative desalination of seawater and brines
Van der Bruggen, Bart
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Biological and Environmental Science and Engineering (BESE) Division
Chemical Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberBAS/1/1323-01-01
Online Publication Date2021-09-29
Print Publication Date2022-01
Embargo End Date2022-09-29
Permanent link to this recordhttp://hdl.handle.net/10754/672039
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AbstractThe pervaporative desalination of synthetic seawater and brines was studied to explore the water flux and salt rejection of a thin-film composite (TFC) membrane made of polydimethylsiloxane (PDMS) dip-coated on porous polysulfone support. Despite the hydrophobic nature of rubbery PDMS, we demonstrate that nonporous TFC membranes exhibit remarkable pervaporative desalination performance as evidenced by very high water permeance and 99.8±0.2% NaCl rejection. For comparison, two commercial hydrophilic polyamide thin-film composite membranes designed for reverse osmosis (RO) were also tested in pervaporation mode. At the highest temperature explored (85 °C) the PDMS thin-film composite membrane produced an outstanding pure water flux of ∼70 kg m-2 h-1, which was 2.6 times higher than that of the best commercial RO membrane tested in this work. Although the presence of salt in the feed water reduced water flux to 36 kg m-2 h-1 (at a brine sodium chloride concentration of 70,000 ppm and 85 °C), the hydrophobic PDMS composite membrane performed among the best compared with previously reported hydrophilic TFC polymer membranes.
CitationGenduso, G., Missinne, A., Ali, Z., Ogieglo, W., Van der Bruggen, B., & Pinnau, I. (2021). Hydrophobic polydimethylsiloxane thin-film composite membranes for the efficient pervaporative desalination of seawater and brines. Separation and Purification Technology, 119819. doi:10.1016/j.seppur.2021.119819
SponsorsThis work was supported by funding from King Abdullah University of Science and Technology (BAS/1/1323-01-01).