Specific ion effects on lignin adsorption and transport through cellulose confinements
Artikel i vetenskaplig tidskrift, 2024

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.

Charge dense ions

Mass transport

Ion-specific effects

Kraft lignin

Hofmeister series

Adsorption

Charge diffuse ions

Pulping

Författare

Roujin Ghaffari

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Vishnu Arumughan

Aalto-Yliopisto

Anette Larsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Journal of Colloid and Interface Science

00219797 (ISSN) 10957103 (eISSN)

Vol. 653 1662-1670

Design for Circularity: Lignocellulose based Thermoplastics - Fib:Re

VINNOVA (2019-00047), 2020-01-01 -- 2024-12-31.

Ämneskategorier

Analytisk kemi

Pappers-, massa- och fiberteknik

DOI

10.1016/j.jcis.2023.09.037

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Senast uppdaterat

2023-12-14