Characterizing salt permeability in polyamide desalination membranes using electrochemical impedance spectroscopy.

ABSTRACT: Improving the performance of desalination membranes requires better measurements of salt permeability in the polyamide separating layer to elucidate the thermodynamic and kinetic components of membrane permselectivity. In this work, electrochemical impedance spectroscopy (EIS) is introduced as a technique to measure the salt permeability and estimate the salt partition coefficient in thin polyamide films created using molecular layer-by-layer deposition. The impedance of supported polyamide films ranging in thickness from 3.5 nm to 28.5 nm were measured in different electrolyte solutions. Impedance spectra were modeled with equivalent circuits containing resistive and capacitive elements associated with the EIS measurement system as well as characteristic low-frequency parallel resistive a

SUBMITTER: Shaffer DL 

PROVIDER: S-EPMC6774373 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature