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Cellulose

pp 1–13 | Cite as

Macroscopic and microscopic properties of fibers after enzymatic deinking of mixed office waste paper

  • Jinran Wang
  • Jinquan WanEmail author
  • Yongwen Ma
  • Yan Wang
Original Research

Abstract

The deinking of mixed office waste paper by cellulase, M/Las (modification of laccase aspartic acid system), and C-M/Las (cellulase synergistic modification of laccase aspartic acid system) was investigated. The fiber morphology parameters, hydrogen bond patterns, cellulose crystallinity, and fiber microstructure were observed via fiber quality analyzer (FQA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results showed that the effective residual ink concentration of enzyme deinked pulp decreased compared with blank pulp (pulp without enzymatic treatment). The deinking efficiencies of C-M/Las, cellulase, and M/Las were 18.17%, 14.01%, and 12.31%, respectively. FQA analysis indicated that the fiber length and curl index decreased, while the fiber width slightly increased. FTIR analysis revealed that after cellulase, M/Las, and C-M/Las treatment, the content of intermolecular hydrogen bonds increased by 14.65%, 13.37%, and 19.80%, respectively. This indicates that there is a synergistic effect between cellulase and M/Las. XRD showed that the cellulose crystallinity decreased after enzymatic deinking. SEM micrographs of fibers treated with enzymes revealed that the fiber surface became rough and more fibrils appeared. The water retention value was increased after enzymatic deinking.

Graphic abstract

Keywords

Cellulase M/Las Deinking Hydrogen bond Cellulose crystallinity WRV 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 31570568, 31670585), Science and Technology Planning Project of Guangzhou City, China (Nos. 201607010079, 201607020007), Science and Technology Planning Project of Guangdong Province, China (Nos. 2016A020221005, 2017A040405022), and the State Key Laboratory of Pulp and Paper Engineering.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Jinran Wang
    • 1
    • 2
    • 3
  • Jinquan Wan
    • 2
    • 3
    Email author
  • Yongwen Ma
    • 2
    • 3
  • Yan Wang
    • 3
  1. 1.School of Light Industry and EngineeringSouth China University of TechnologyGuangzhouChina
  2. 2.State Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouChina
  3. 3.Guang Dong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research CenterGuangzhouChina

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