Ionic liquid-aided hydrothermal treatment of lignocellulose for the synergistic outputs of carbon dots and enhanced enzymatic hydrolysis

Jikun Xu*, Lin Dai, Chuntao Zhang, Yang Gui, Lan Yuan, Yang Lei, Baoan Fan

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

How to propel an efficient exploitation of waste streams is a pivotal tache for the long-range augment of hydrothermal biomass valorization. A facile approach was proposed to simultaneously produce carbon dots (CDs), fermentable sugar, and cellulose enzymatic lignin from agricultural straw with the aid of ionic liquid (IL, 1-aminoethyl-3-methylimidazolium nitrate, [C2NH2MIm][NO3]) catalyzed hydrothermal treatment. The graphite N-doped CDs with bright-blue fluorescence, which was mainly derived from the incorporation of hemicellulose (e.g. xylooligosaccharides), lignin and [C2NH2MIm][NO3], exhibited an average-diameter of 8.14 nm. The exfoliation of amorphous parts and robust fibers was formed to improve cellulose digestibility from 14.7 to 81.6%. The efficient recovery and checkup of lignin pave a way for its potential depolymerization into arenes. This protocol offers a significant benefit for large-scale hydrothermal biorefinery where reduction of process waste is a prime concern, and leads to high-value products (i.e., CDs and lignin) that also fosters the feasibility of bioethanol.

Original languageEnglish
Article number123043
JournalBioresource Technology
Volume305
ISSN0960-8524
DOIs
Publication statusPublished - 2020

Keywords

  • Biomass
  • Carbon dots
  • Cellulose enzymatic hydrolysis
  • Ionic liquid-aided hydrothermal
  • Lignin

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