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The structural change of residual lignin of bamboo pulp in Co-salen biomimetic bleaching was studied with GPC,FT-IR,1H-NMR,31P-NMR and element analysis.It was found that the methoxyl group,phenolic hydroxyl group,aliphatic hydroxyl group,guaiacyl and syringyl reduced;the content of carbonyl group increased;the aromatic ring was opened,the linkages of β-O-4,β-1,β-5 and β-β were cleaved,the molecular weight of residual lignin decreased.The chromophore of the bleached pulp with Co-salen biomimetic pretreatment reduced and its crystallinity increased.The experimental formulas(C9) of the residual lignin of the bamboo pulp before and after biomimetic treatment were also obtained.

Mechanism of Co-salen Biomimetic Catalysis Bleaching of Bamboo Pulp