Issue 2, 2013

Effects of pH on pretreatment of sugarcane bagasse using aqueous imidazolium ionic liquids

Abstract

Pretreatments of sugarcane bagasse for saccharification using different acid-catalysed imidazolium IL solutions (containing 20% water) at 130 °C for 30 min were investigated. At the same solution pH, pretreatment effectiveness in terms of glucan digestibility, delignification and xylan removal was similar for aqueous 1-butyl-3-methylimidazolium methane sulfonate (BMIMCH3SO3), 1-butyl-3-methylimidazolium methyl sulfate (BMIMCH3SO4), 1-ethyl-3-methylimidazolium chloride (EMIMCl) and 1-butyl-3-methylimidazolium chloride (BMIMCl). Decreasing solution pH of aqueous IL systems from 6.0 to 0.4 increased bagasse delignification and xylan removal, and as a result, improved glucan digestibility. The glucan digestibilities for bagasse samples pretreated by IL solutions with pH ≤0.9 were >90% after 72 h of enzymatic hydrolysis. Without pH adjustment, the effectiveness of these aqueous IL solutions (except BMIMCH3SO3 because of its low natural pH of 0.9) to deconstruct the biomass was poor and the glucan digestibilities of pretreated bagasse samples were <20%. These results show that pretreatment effectiveness of aqueous imidazolium ILs can simply be estimated from solution pH rather than hydrogen bond basicity (β) of the IL solution.

Graphical abstract: Effects of pH on pretreatment of sugarcane bagasse using aqueous imidazolium ionic liquids

Supplementary files

Article information

Article type
Paper
Submitted
13 Jul 2012
Accepted
22 Oct 2012
First published
25 Oct 2012

Green Chem., 2013,15, 431-438

Effects of pH on pretreatment of sugarcane bagasse using aqueous imidazolium ionic liquids

Z. Zhang, I. M. O'Hara and W. O. S. Doherty, Green Chem., 2013, 15, 431 DOI: 10.1039/C2GC36084E

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