Modeling salt adsorption in electrical double layer for capacitive deionization

Lin, Yu‐Jeng; Chen, Chau‐Chyun

doi:10.1002/aic.18018

Modeling salt adsorption in electrical double layer for capacitive deionization

Journal Article · Wed Jan 18 00:00:00 EST 2023 · AIChE Journal

DOI:https://doi.org/10.1002/aic.18018· OSTI ID:1983555

^[1]; ^[2]

Department of Chemical Engineering National Tsing Hua University HsinChu City Taiwan
Department of Chemical Engineering Texas Tech University Lubbock Texas USA

Abstract

This work presents an electrical double layer (EDL) model for capacitive deionization (CDI) by intercorrelating the salt adsorption, the electrode voltage, and the surface charge density. The counterion condensation is considered a crucial contribution to salt adsorption because of the high surface charge density in the charged micropores. The counterions condense when the surface charge density exceeds a critical value, which is predicted by the counterion condensation theory. The EDL model accurately correlates the NaCl salt adsorption and electrode voltage with various surface charge densities and well predicts the salt adsorption in a wide range of external salt concentrations. The EDL model reproduces the non‐monotonic relationship between the salt adsorption and the specific surface area observed in experiments and provides an explanation from the modeling perspective. Exhibiting superior accuracy and predictability for salt adsorption, the EDL model could serve as an enabling tool contributing to the development of CDI processes.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0007888

OSTI ID:: 1983555

Journal Information:: AIChE Journal, Journal Name: AIChE Journal Journal Issue: 5 Vol. 69; ISSN 0001-1541

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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