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首页> 外文期刊>Clean technologies and environmental policy >Conversion of rice husk into reducing sugars: influence of pretreatment with water and C16MIMBr? ionic liquid
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Conversion of rice husk into reducing sugars: influence of pretreatment with water and C16MIMBr? ionic liquid

机译：Conversion of rice husk into reducing sugars: influence of pretreatment with water and C16MIMBr? ionic liquid

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Abstract Rice husk is an agricultural lignocellulosic-rich residue that can be used in the production of second-generation ethanol. A biomass pretreatment is necessary to release structural sugars because of the recalcitrance-related properties of lignin and silicon. The use of a long-chain imidazolium ionic liquid (IL), 1-hexadecyl-3-methylimidazolium bromide (C16MIMBr?), for rice husk pretreatment is reported for the first time. The influence of C16MIMBr?-to-water ratio and temperature in a hydrothermal pretreatment on reducing sugars yield obtained by enzymatic hydrolysis was investigated using an experimental design with a temperature range of 80–160?°C, varying the IL-to-water ratio between 1:5 and 1:30, with 10 (w/v) of biomass in 12?h. Structural, chemical and morphological changes were observed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Sugar yield was enhanced when combining the highest temperature (160 oC) and lowest ionic liquid ratio (1:5, IL:water). The validation assay (180?°C, 1:20 IL-to-water ratio, 10 (w/v) of biomass, 12?h) resulted in 38 yield of reducing sugars and 60 dissolution of biomass, whereas untreated biomass showed only 0.18 yield of reducing sugars. The IL pretreatment affected the rice husk structure and morphology. Rice husk pretreatment with C16MIMBr? resulted in a higher concentration of reducing sugars compared to untreated biomass. Therefore, solid ionic liquids combined with water could be used as an alternative solvent for lignocellulosic biomass pretreatment.Graphical abstract

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