Anion-Specific Adsorption of Carboxymethyl Cellulose on Cellulose
Journal article, 2023

Integration of fiber modification step with a modern pulp mill is a resource efficient way to produce functional fibers. Motivated by the need to integrate polymer adsorption with the current pulping system, anion-specific effects in carboxymethylcellulose (CMC) adsorption have been studied. The QCM-D adsorption experiments revealed that CMC adsorption to the cellulose model surface is prone to anion-specific effects. A correlation was observed between the adsorbed CMC and the degree of hydration of the co-ions present in the magnesium salts. The presence of a chaotropic co-ion such as nitrate increased the adsorption of CMC on cellulose compared to the presence of the kosmotropic sulfate co-ion. However, anion-specificity was not significant in the case of salts containing zinc cations. The hydration of anions determines the distribution of the ions at the interface. Chaotropic ions, such as nitrates, are likely to be distributed near the chaotropic cellulose surface, causing changes in the ordering of water molecules and resulting in greater entropy gain once released from the surface, thus increasing CMC adsorption.

Author

Vishnu Arumughan

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Hüsamettin Deniz Özeren

Royal Institute of Technology (KTH)

M. S. Hedenqvist

Royal Institute of Technology (KTH)

M. Skepo

Lund University

Tiina Nypelö

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Merima Hasani

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Anette Larsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Langmuir

07437463 (ISSN) 15205827 (eISSN)

Vol. 39 42 15014-15021

Subject Categories

Paper, Pulp and Fiber Technology

DOI

10.1021/acs.langmuir.3c01924

PubMed

37817605

More information

Latest update

11/10/2023