Ionic-liquid pretreatment of cassava residues for the cogeneration of fermentative hydrogen and methane
Abstract An ionic liquid of N-methylmorpholine-N-oxide (NMMO) was used to effectively pretreat cassava residues for the efficient enzymatical hydrolysis and cogeneration of fermentative hydrogen and methane. The reducing sugar yield of enzymolysed cassava residues with NMMO pretreatment improved from 36 to 42g/100g cassava residues. Scanning electron microscopy images revealed the formation of deep grooves (∼4μm wide) and numerous pores in the cassava residues pretreated with NMMO. X-ray diffraction patterns showed that the crystallinity coefficient of NMMO-pretreated cassava residues decreased from 40 to 34. Fourier transform infrared spectra indicated that crystal cellulose I was partially transformed to amorphous cellulose II in the NMMO-pretreated cassava residues. This transformation resulted in a reduced crystallinity index from 0.85 to 0.77. Hydrogen yield from the enzymolysed cassava residues pretreated with NMMO increased from 92.3 to 126mL/gTVS, and the sequential methane yield correspondingly increased from 79.4 to 101.6mL/g TVS. Highlights Cassava residues were pretreated by ionic liquid N-methylmorpholine-N-oxide (NMMO). NMMO-pretreated cassava residues generated deep grooves (∼4μm in width) and pores. Cellulose I became cellulose II in NMMO-pretreated cassava residues. H 2 yield from NMMO-pretreated cassava residues after enzymolysis was enhanced. Overall energy conversion increased to 21.4–27.9% in H 2 /CH 4 cogeneration.
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