Locust bean gum adsorption onto softwood kraft pulp fibres: isotherms, kinetics and paper strength
| Autor: | Jingqian Chen, Heather L. Trajano, Rodger P. Beatson |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
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 |
| Zdroj: | Cellulose (London, England) |
| ISSN: | 1572-882X 0969-0239 |
| DOI: | 10.1007/s10570-021-04133-w |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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