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Locust bean gum adsorption onto softwood kraft pulp fibres: isotherms, kinetics and paper strength
- Source :
- Cellulose (London, England)
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- The adsorption of locust bean gum (LBG) onto Northern Bleached Softwood Kraft (NBSK) pulp improved paper tensile and burst strength and lowered refining energy by strengthening inter-fibre bonding. Adsorption kinetics and isotherms were investigated to develop a fundamental understanding of the adsorption mechanism. The adsorption rate followed pseudo-second-order kinetics and the activation energy was 99.34 kJ·mol−1, suggesting chemisorption. The adsorption rate constant increased rapidly with temperature from 25 to 45 °C (k = 1.93 to 24.03 g·mg−1·min−1), but the amount adsorbed at equilibrium decreased (qe = 1.91 to 0.48 mg·g−1 o.d. fibre). LBG adsorption to NBSK at 25 °C was consistent with the Langmuir adsorption model for LBG n = 5.00, and the equilibrium constant Kf = 2.57 mg·g−1·(mg·L−1)−1/n at 25 °C. Favorable adsorption conditions for negatively charged LBG were identified: 25 °C for 10 min, low dosage level ( 150 r.p.m.), acidic or neutral conditions (pH 2–7) without salt addition. Graphic abstract
- Subjects :
- Softwood
Polymers and Plastics
Chemistry
Adsorption isotherms
Pulp (paper)
Locust bean gum
Langmuir adsorption model
engineering.material
Northern bleached softwood kraft
Hemicellulose
Northern bleached softwood kraft pulp
symbols.namesake
chemistry.chemical_compound
Adsorption kinetics
Adsorption
Paper strength additive
Chemical engineering
Kraft process
Chemisorption
symbols
engineering
Original Research
Subjects
Details
- ISSN :
- 1572882X and 09690239
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Cellulose
- Accession number :
- edsair.doi.dedup.....6818f76c78e5fa16e1e09fc090469ab0