4.8 Article

Tandem strategy of photocatalytic preoxidation-ultrasonic cavitation depolymerization for lignin valorization

Journal

BIORESOURCE TECHNOLOGY
Volume 363, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127880

Keywords

Biomass; Pretreatment; Photocatalysis; Ethanolysis; Enhancement

Funding

  1. National Key R & D Program of China [2018YFB1501500]
  2. National Natural Science Foundation of China [52106230]
  3. China Postdoctoral Science Foundation [2022 T150114, 2020 M681454]
  4. Natural Science Foundation of Jiangsu Province [BK20210237]

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A tandem strategy combining photocatalytic preoxidation and ultrasonic cavitation depolymerization was proposed for lignin utilization, which greatly enhanced the depolymerization efficiency and product yield, providing a new idea for lignin valorization.
Tandem strategy for lignin utilization with photocatalytic preoxidation and ultrasonic cavitation depolymerization was proposed. Cornstalk residual lignin from industrial bioethanol process was first photocatalytically preoxidized under visible light by g-C3N4 and WO3/g-C3N4/h-BN (WCB) photocatalysts respectively, then obtained lignin samples were characterized to confirm the preoxidation with raw lignin as a blank. During photocatalytic preoxidation, benzyl hydroxyls in lignin was transformed to carbonyls, but a certain degree of lignin degradation and condensation was observed. In comparison, WCB-catalyzed photopreoxidation was more effective. Thereafter, lignin depolymerization was achieved by ultrasonic cavitation-assisted ethanololysis under optimal conditions. Compared with the mere ultrasonic cavitation depolymerization of pristine lignin, WCB-induced photocatalytic preoxidation improved the conversion rate by 14%, the light-oil yield by 26%, and the phenolic monomer yield by 35%. In general, the reported tandem method worked very well for the enhancement of lignin depolymerization and provided a new idea for the development of lignin valorization.

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