Nanoscale control of internal inhomogeneity enhances water transport in desalination membranes

被引：286

作者：

Culp, Tyler E. ^{[1
]}

Khara, Biswajit ^{[2
]}

Brickey, Kaitlyn P. ^{[1
]}

Geitner, Michael ^{[1
]}

Zimudzi, Tawanda J. ^{[3
]}

Wilbur, Jeffrey D. ^{[4
]}

Jons, Steven D. ^{[4
]}

Roy, Abhishek ^{[5
]}

Paul, Mou ^{[6
]}

Ganapathysubramanian, Baskar ^{[2
]}

Zydney, Andrew L. ^{[1
]}

Kumar, Manish ^{[7
]}

Gomez, Enrique D. ^{[1
,3
,8
]}

机构：

[1] Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA

[2] Iowa State Univ, Dept Mech Engn, Ames, IA 50011 USA

[3] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA

[4] DuPont Water Solut, Edina, MN 55439 USA

[5] Dow Chem Co USA, Freeport, TX 77541 USA

[6] Dow Chem Co USA, Lake Jackson, TX 77566 USA

[7] Univ Texas Austin, Dept Civil Architectural & Environm Engn, Austin, TX 78712 USA

[8] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

来源：

SCIENCE | 2021年 / 371卷 / 6524期

基金：

美国国家科学基金会;

关键词：

FILM COMPOSITE MEMBRANES; REVERSE-OSMOSIS DESALINATION; OF-THE-ART; POLYAMIDE MEMBRANES; LAYER; PERMEABILITY; DIFFUSION; SECURITY; SCIENCE; POLYMER;

D O I：

10.1126/science.abb8518

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Biological membranes can achieve remarkably high permeabilities, while maintaining ideal selectivities, by relying on well-defined internal nanoscale structures in the form of membrane proteins. Here, we apply such design strategies to desalination membranes. A series of polyamide desalination membranes-which were synthesized in an industrial-scale manufacturing line and varied in processing conditions but retained similar chemical compositions-show increasing water permeability and active layer thickness with constant sodium chloride selectivity. Transmission electron microscopy measurements enabled us to determine nanoscale three-dimensional polyamide density maps and predict water permeability with zero adjustable parameters. Density fluctuations are detrimental to water transport, which makes systematic control over nanoscale polyamide inhomogeneity a key route to maximizing water permeability without sacrificing salt selectivity in desalination membranes.

引用

页码：72 / 75

页数：4

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