Efficient fractionation and targeted valorization of industrial xylose residue by synergistic and mild alkaline deep eutectic solvent‑hydrogen peroxide pretreatment

Abstract

Achieving efficient fractionation and tailored downstream high value-added applications of bulk industrial waste biomass could guarantee the sustainability of biorefinery strategies. A synergistic and mild alkaline deep eutectic solvent‑hydrogen peroxide (DES-HP) pretreatment was designed in this study to significantly reduce pretreatment costs while achieving efficient fractionation of industrial xylose residues for preparing high antioxidative lignin and high enzymatic digestion of cellulose substrates for subsequent bioenergy and biochemicals production. The results demonstrated that this DES-HP pretreatment had admirable biomass deconstruction ability and the obtained DES-HP lignin displayed well-preserved structures and excellent antioxidative properties, which facilitated downstream catalytic degradation as well as the production of lignin-based materials and chemicals. Under the optimal condition (60 °C, 2 h, 10 FPU/g), the fermentable glucose yield of the DES-HP pretreated substrate could achieve 95.89%. In conclusion, this synergistic DES-HP is an ideal pretreatment strategy for the current tailored biorefinery scenario of industrial lignocellulosic biomass.