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Cellulose

, Volume 26, Issue 6, pp 4085–4098 | Cite as

Alkaline deep eutectic solvent: a novel green solvent for lignocellulose pulping

  • Wei-Lun Lim
  • Ahmad Anas Nagoor GunnyEmail author
  • Farizul Hafiz Kasim
  • Inas Muen AlNashef
  • Dachyar Arbain
Original Research
  • 206 Downloads

Abstract

This work studied the feasibility of potassium carbonate-glycerol deep eutectic solvent (K2CO3-Gly DES) as a potential green solvent applied in lignocellulose pulping. Cellulose fibers were extracted from rice straw via novel alkaline DES pulping technique using 1:7 molar ratio of K2CO3-Gly DES. Optimum pulping parameters were determined using the one-factor-at-a-time (OFAT) method. The cellulose fibers were characterized for chemical composition of cellulose, hemicellulose, lignin and extractives. Changes in physical structure, chemical structure, morphological structure, functional groups and crystallinity index (CrI) were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results revealed that the optimum pulping temperature at 140 °C, reaction time of 100 min and 1:10 rice straw to DES mass ratio produced the highest cellulose content of 73.8% for unbleached DES treated pulp. Chemical composition analysis and FTIR verified that this alkaline DES pulping method was able to achieve partial removal of hemicellulose and lignin from lignocellulosic matrix. Moreover, XRD result demonstrated that the CrI of cellulose fiber increased from 52.8 to 60.0% after pretreatment. The cellulose fibers had diameters ranging from 3.58 to 5.68 µm. This study proved that the specifically-designed K2CO3-Gly DES could successfully isolate cellulose from lignocellulosic biomass through alkaline DES pulping.

Graphical abstract

Keywords

Deep eutectic solvent Potassium carbonate Glycerol Cellulose pulp Alkaline DES pulping 

Notes

Acknowledgments

The authors would like to thank the School of Bioprocess Engineering, Universiti Malaysia Perlis (UniMAP) for their support in this research.

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest in the publication.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Wei-Lun Lim
    • 1
  • Ahmad Anas Nagoor Gunny
    • 2
    • 3
    Email author
  • Farizul Hafiz Kasim
    • 1
    • 2
  • Inas Muen AlNashef
    • 4
  • Dachyar Arbain
    • 1
    • 5
  1. 1.School of Bioprocess EngineeringUniversiti Malaysia PerlisArauMalaysia
  2. 2.Centre of Excellence for Biomass Utilization, School of Bioprocess EngineeringUniversiti Malaysia PerlisArauMalaysia
  3. 3.Department of Chemical Engineering Technology, Faculty of EngineeringUniversiti Malaysia PerlisPadang BesarMalaysia
  4. 4.Department of Chemical EngineeringKhalifa University of Science and TechnologyAbu DhabiUnited Arab Emirates
  5. 5.Center for Renewable Energy, STT-PLNJalan Lingkar Luar Barat KosambiJakartaIndonesia

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