Specific ion effects on lignin adsorption and transport through cellulose confinements

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors

Date

2024-01

Department

Department of Bioproducts and Biosystems

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Language

en

Pages

9

Series

Journal of Colloid and Interface Science, Volume 653, issue Part B, pp. 1662-1670

Abstract

The presence of ions in a solution is anticipated to induce distinct effects on macromolecules. Consequently, the tuning of adsorption and mass transfer of lignin molecules can be achieved by incorporating ions with chaotropic or kosmotropic characteristics. This study examines the adsorption and mass transfer behavior of lignin molecules across model cellulose membranes in presence of ions from the Hofmeister series. Experimental investigations encompassed the use of diffusion cells to quantify lignin's mass transfer through the membranes, and quartz crystal microbalance with dissipation (QCM-D) monitoring was used for adsorption studies. Notably, at high ion concentrations, the mass transport rate of lignin was observed to be lower in the presence of highly hydrated (kosmotropic) sulfate ions, conforming to the Hofmeister series. Intriguingly, this relationship was not apparent at lower ion concentrations. Furthermore, QCM-D experiments indicated that lignin displayed higher adsorption onto the cellulose surface when exposed to less hydrated (chaotropic) nitrate anions. This behavior can be rationalized by considering the system's increased entropy gain, facilitated by the release of adsorbed ions and water molecules from the cellulose surface upon lignin adsorption. This study highlights the complexity of ion-specific effects on mass transfer and adsorption processes and their dependency on ion concentrations.

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Funding Information: The Authors acknowledge the financial support of the Knut and Allice Wallenberg Foundation through the Wallenberg Wood Science Center (WWSC) and the support of BIOINNOVATION, VINNOVA, Sweden, through the FibRe– Design for circularity – Lignocellulose-based thermoplastics competence center (grant number 2019-00047). Publisher Copyright: © 2023 The Author(s)

Keywords

Adsorption, Charge dense ions, Charge diffuse ions, Hofmeister series, Ion-specific effects, Kraft lignin, Mass transport, Pulping

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DOI

10.1016/j.jcis.2023.09.037

Citation

Ghaffari, R, Arumughan, V & Larsson, A 2024, 'Specific ion effects on lignin adsorption and transport through cellulose confinements', Journal of Colloid and Interface Science, vol. 653, no. Part B, pp. 1662-1670. https://doi.org/10.1016/j.jcis.2023.09.037

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https://urn.fi/URN:NBN:fi:aalto-202311016723

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[article-cris] Kemian tekniikan korkeakoulu / CHEM