Synergistic effects of surfactant-assisted ionic liquid pretreatment rice straw

Bioresour Technol. 2016 Aug:214:371-375. doi: 10.1016/j.biortech.2016.04.113. Epub 2016 Apr 26.

Abstract

The aim of this work was to study an environmentally friendly method for pretreating rice straw by using 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as an ionic liquid (IL) assisted by surfactants. Different temperatures, reaction times, and surfactant concentrations were studied. Compared with [BMIM]Cl only pretreatment, the addition of 1% sodium dodecyl sulfate (SDS) and 1% cetyl trimethyl ammonium bromide (CTAB) increased lignin removal to 49.48% and 34.76%, respectively. Untreated and pretreated rice straw was thoroughly characterized through FTIR, XRD, and FE-SEM. Cellulose crystallinity and surface morphology of the rice straw were substantially altered after surfactant-assisted IL pretreatment. In conclusion, surfactant-assisted IL pretreatment is an effective method for producing fermentable sugars from lignocellulosic substrates.

Keywords: Enzymatic hydrolysis; Ionic liquid; Pretreatment; Surfactant.

MeSH terms

  • Carbohydrate Metabolism / drug effects
  • Cellulase / chemistry
  • Cellulose / chemistry
  • Crystallization
  • Hydrolysis
  • Imidazoles / pharmacology
  • Ionic Liquids / pharmacology*
  • Oryza / chemistry*
  • Oryza / drug effects
  • Oryza / ultrastructure
  • Spectroscopy, Fourier Transform Infrared
  • Surface-Active Agents / pharmacology*
  • Temperature
  • Waste Products*
  • X-Ray Diffraction

Substances

  • Imidazoles
  • Ionic Liquids
  • Surface-Active Agents
  • Waste Products
  • 1-butyl-3-methylimidazolium chloride
  • Cellulose
  • Cellulase