STRUCTURAL CHANGES OF MILLED WOOD LIGNIN IN TREATMENT WITH IRON-BASED BIOMIMETIC COMPOUND
The ability of fungal enzymes in degradation of lignin has promoted the exploration of simple compounds which can simulate the function of the enzymes. Iron-based biomimetic compound which is selective catalysts in delignification has been a hot topic for a decade. In the present research, a novel biomimetic system which uses a transition metal (Fe) and a chelate compound (CA) to form a coordination compound was developed. This complex can catalyze H2O2 to produce hydroxyl radicals (·OH) and superoxide radicals (·O2) which can decompose wide ranges of polycyclic aromatic hydrocarbons. The structural changes of lignin during the degradation by this biomimetic compounds was investigated using milled wood lignin (MWL) from triploid ofpopulus tomentosa as reaction substrate. In order to understand the changes of chemical structure of the MWL, the combination of FT-IR and (GC-MS) were applied as the analytic methods. It is found that this biomimetic system is very efficient in degrading MWL. The FT-IR and GC-MS analyses indicate that a large number of aromatic low molecular aromatic compounds with hydroxyl, carbonyl and carboxyl groups are produced after the treatment. Finally, a conclusion can be drawn that biomimetic treatment lead to cleavage of the linkages as β-O-4, β-β, and β-5 etc., with the increase of low molecular aromatic compounds. Therefore, the iron-based biomimetic compound is an attractive approach to pulp delignification. It will be a promising delignification reagent in pulp bleaching.
biomimetic degradation milled wood lignin structural change, bleaching
Mingyu Ma Yimin Xie Haitao Yang Peng Wang
Key Laboratory of Paper Science and Technology of Ministry of Education, Shandong Institute of Light Key Laboratory of Paper Science and Technology of Ministry of Education, Shandong Institute of Light Research Institute of Pulp and Paper Engineering, Hubei University of Technology, Wuhan, 430068, Chi
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
270-272
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）