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Studies on interactions between aluminum compounds and cellulosic fibers in water by means of27Al-NMR

Abstract

Interactions between pulp fibers and aluminum compounds in pulp suspensions were studied using fibrous cellulose (FC) and fibrous carboxymethylcellulose (FCMC) powders as models of pulp fibers by X-ray fluorescence analysis and27Al nuclear magnetic resonance. When deionized water was used at pH 4–5, water-soluble cationic aluminum species (Al3+, aluminum oligomer, and polyaluminum species) were adsorbed on the solid FCMC, forming carboxylic acid aluminum salts by cation exchange. The formation of these nondissociated pulp-COOAl type structures in paper sheets may contribute to some decreases in hydrophilic property. On the other hand, the water-soluble cationic aluminum species had nearly no interactions with hydroxyl groups of solid cellulose in the suspensions at pH 4–5. When tap water was used at pH 5–7, some aluminum components were retained on not only FCMC but also the FC sample. Probably, water-insoluble Al(OH)3 flocs are formed in the suspensions at pH 5–7 and retained on the FC sample by simple filtration effect. Therefore, two mechanisms of the aluminum retention (i.e., electrostatic interactions and a simple filtration effect) may exist between pulp fibers and aluminum components in the practical papermaking process.

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Correspondence to Akira Isogai.

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Kato, M., Isogai, A. & Onabe, F. Studies on interactions between aluminum compounds and cellulosic fibers in water by means of27Al-NMR. J Wood Sci 46, 310–316 (2000). https://doi.org/10.1007/BF00766222

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Key words

  • Aluminum compound
  • Cellulose powder
  • Carboxymethylcellulose
  • 27Al-NMR
  • Water retention value