Synergistic Enhancement of Straw Sugar Production by Modified TiO2 under Sunlight Irradiation
In order to strengthen the clean utilization of biomass energy and improve the conversion rate of biomass sugar,L-valine modified titanium dioxide composite catalyst was synthesized in this study.Subsequently,using lignin removal efficiency and reducing sugar yield as index,the biomass pretreatment and enzymatic saccharification from straw material were enhanced by combining the modified titanium dioxide and solar light.During the process,the effects of catalyst type,catalyst concentration,pH,sunlight exposure time,and lighting method on the reducing sugar yield were investigated.On the basis of single factor experiments,orthogonal experiments were conducted to optimize the process parameters.The results of SEM and FT-IR showed that L-valine was successfully loaded onto titanium dioxide particles;The composite catalyst in combination with sunlight irradiation can effectively enhance the reducing sugar yield of straw.Taking cost-effectiveness into consideration,the optimum conditions determined statistically via orthogonal methodology were modified TiO2 catalyst concentration(35 mg/L),pH(6.0),pre-treatment time(70 mins)for maximum lignin removal efficiency(93.1%).After pre-treatment,the enzymatic hydrolysis and saccharification process adopted a light-dark alternating cycle scheme with an enzyme load of 20 FPU/g,and the reduction sugar yield could reach 117.3 mg/g,which was very significant.
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