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| Catalytic Degradation of Alkali Lignin by Laccase Mediator System and Its Structural Evolution Studies |
| Received:January 12, 2024 Revised:February 05, 2024 |
| DOI：10.11981/j.issn.1000-6842.2024.02.44 |
| Key Words:alkali lignin;laccase;mediator;degradation |
| Fund Project:广东省基础与应用基础研究基金（2022A1515012584，2022A1515110640）；广东省科学院专项资金（2022GDASZH-2022010105）。 |
| Author Name | Affiliation | Postcode | | CUI Dingkai | College of Light and Chemical Engineering， Guangdong University of Technology， Guangzhou， Guangdong Province， 510006 | 510006 | | YI Guobin | College of Light and Chemical Engineering， Guangdong University of Technology， Guangzhou， Guangdong Province， 510006 | 510006 | | YE Dawei | Institute of Chemical Engineering， Guangdong Academy of Sciences， Guangzhou， Guangdong Province， 510665 | 510665 | | ZHU Guozhi | Institute of Chemical Engineering， Guangdong Academy of Sciences， Guangzhou， Guangdong Province， 510665 | 510665 | | XIAO Ying* | Institute of Chemical Engineering， Guangdong Academy of Sciences， Guangzhou， Guangdong Province， 510665 | 510665 | | CHEN Jiazhi* | Institute of Chemical Engineering， Guangdong Academy of Sciences， Guangzhou， Guangdong Province， 510665 | 510665 |
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| Abstract: |
| Laccase-mediator system （LMS）， which uses the mediator as an electron shuttle， has been widely used in the degradation of environmental pollutants because of its higher catalytic efficiency for substrates. This study systematically investigated the degradation effects of laccase and laccase/H2O2， laccase/HBT （1-hydroxybenzotriazole） and laccase/ABTS （2，2’-bisazobis （3-ethylbenzothiazolin-6-sulfonic acid） diammonium salt） on alkali lignin， and explored the influencing factors of laccase/ABTS mediator system on degradation of alkali lignin. The structural characterization of alkali lignin before and after the reaction with laccase and the three LMS was also analyzed. The results showed that the highest degradation rate of alkali lignin was achieved by the laccase/ABTS mediator system， which could reach 39% under the reaction conditions at 32 ℃ for 24 h with pH valve of 5， and ABTS concentration of 2 mmol/L. The types of functional groups of alkali lignin obtained from the laccase treatment remained unchanged， but the polydispersity coefficient was decreased and the molecular mass was increased； and the polydispersity coefficient and the molecular mass of alkali lignin obtained from the LMS treatment were further decreased， especially the polydispersity coefficient and the molecular mass of alkali lignin obtained from the LMS treatment. In particular， the number average molecular weight of alkali lignin was reduced by 50.5% after laccase/ABTS treatment； the chemical bonds of alkali lignin were broken to different degrees after LMS treatment， which induced changes such as C—O and β-O-4 linkage breaking， demethylation reaction， and benzene ring-opening. |
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