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As a complex aromatic biopolymer that constitutes 25%–35%of renewable carbon on the earth,lignin is the only large-volume renewable source of aromatic chemicals[1].Lignin has an extended network built from alcohol monomers via intermolecular C–O and C–C bonds in a random order[2],leading to a highly irregular polymeric structure and a recalcitrant nature.Hence,lignin is broadly considered as an industrial waste product,and tradition-
As a complex aromatic biopolymer that constitutes 25% -35% of renewable carbon on the earth, lignin is the only large-volume renewable source of aromatic chemicals [1]. Lignin has an extended network built from alcohol monomers via intermolecular C-O and C-C bonds in a random order [2], leading to a highly irregular polymeric structure and a recalcitrant nature .ence, lignin is broadly considered as an industrial waste product, and tradition-