Alkali-ultrasonication, hotliquid water and ligninolytic enzymes pretreatments for bioethanol production from cotton gin trash (CGT)
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Cotton gin trash (CGT) is a lignocellulosic residue that can be used in the production of cellulosic ethanol. this research evaluated the effect of perform an alkaline hydrolysis (NaOH) together with the ultrasonication pretreatment, previously to a liquid hot water and ligninolytic enzymes pretreatments for. Three different concentrations (5%, 10%, and 15%) of sodium hydroxide (NaOH) were evaluated to identify if the concentration of NaOH can influence the cellulose conversion and ethanol yield. The changes in the CGT structure were followed using the signals of the FT-IR spectrum. The three concentrations employed for the alkali-ultrasonication pretreatment produced higher ethanol yields and cellulose conversion than the experiment without NaOH. Additionally, the concentration of 15% was selected as the best NaOH concentration generating an increment of two fold compared with the treatment without NaOH. The FT-IR spectrum confirmed modifications in the CGT structure across the different pretreatments. The union of ultrasonication-alkali hydrolysis, hot liquid water and ligninolytic enzymes showed an interesting improvement in the way to generate a more feasible process for the production of bioethanol from CGT.
