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Effective delignification of lignocellulosic biomass by microwave assisted deep eutectic solvents.

Authors
  • Kohli, Kirtika1
  • Katuwal, Sarmila2
  • Biswas, Atanu3
  • Sharma, Brajendra K4
  • 1 Prairie Research Institute - Illinois Sustainable Technology Center, University of Illinois at Urbana-Champaign, 1 Hazelwood Drive, Champaign, IL 61820, USA. Electronic address: [email protected]
  • 2 Prairie Research Institute - Illinois Sustainable Technology Center, University of Illinois at Urbana-Champaign, 1 Hazelwood Drive, Champaign, IL 61820, USA.
  • 3 National Center for Agricultural Utilization Research, Agricultural Research Service, United States Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA. , (United States)
  • 4 Prairie Research Institute - Illinois Sustainable Technology Center, University of Illinois at Urbana-Champaign, 1 Hazelwood Drive, Champaign, IL 61820, USA. Electronic address: [email protected]
Type
Published Article
Journal
Bioresource technology
Publication Date
May 01, 2020
Volume
303
Pages
122897–122897
Identifiers
DOI: 10.1016/j.biortech.2020.122897
PMID: 32036329
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

To establish an environmentally friendly and cheaper method to delignify lignocellulosic biomass feedstocks, deep eutectic solvents (DESs) were investigated as a green alternatives to conventional solvents. Six different DESs were facilely prepared and used to delignify miscanthus and birchwood feedstocks, including monocarboxylic acid/choline chloride (ChCl), dicarboxylic acid/ChCl and polyalcohol/ChCl. The enhanced delignification efficiency was evaluated in relation to the nature of the hydrogen bond donors and acid strength of DES. The largest extraction of lignin from the miscanthus and birchwood was achieved using ChCl.formic acid and ChCl.oxalic acid DES, respectively. The TGA and 13C NMR characterization results of the extracted lignin samples indicated that the different types of lignin were produced using different DESs. The reaction optimization results showed an increase in lignin extraction with increasing temperature from 60 to 130 °C. However, the optimal reaction time was different, 30 min for miscanthus and 60 min for birchwood. A convenient and reliable method for the quantification of lignin was developed using UV-Vis spectrophotometry. Copyright © 2020 Elsevier Ltd. All rights reserved.

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