Chemical insights into the base-tuned hydrothermal treatment of side stream biomasses

Herein, we analyzed the hydrothermal processes applied to four very different side stream biomasses (chestnut foliage, sugar beet pressing chips, pine bark and branches from park cleaning, bamboo cuts) and identified diverse soluble products depending on the starting pH of the reaction, covering mil...

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Bibliographic Details
Published in:Sustainable energy & fuels 2023-01, Vol.7 (3), p.769-777
Main Authors: Tkachenko, Vitalii, Marzban, Nader, Vogl, Sarah, Filonenko, Svitlana, Antonietti, Markus
Format: Article
Language:English
Subjects:
Bamboo
Bark
Biodiversity
Biomass
Controllability
Disintegration
Foliage
Humification
Hydrothermal treatment
NMR
Nuclear magnetic resonance
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Summary:Herein, we analyzed the hydrothermal processes applied to four very different side stream biomasses (chestnut foliage, sugar beet pressing chips, pine bark and branches from park cleaning, bamboo cuts) and identified diverse soluble products depending on the starting pH of the reaction, covering mild to strong basic pH conditions. Despite the biological diversity of the starting products, hydrothermal disintegration of biomass results in a remarkable reduction of chemical diversity towards a controllable number of molecular products, and the well-resolved and rather simple NMR-spectra allow the assignment of the products to only a few families of compounds. It has been revealed that in comparison with the classical hydrothermal treatment, where mostly hydrochar is produced, molar excess of base shifts the hydrothermal treatment towards a humification process. A further increase of the base content causes destruction of the biomass into the more oxygenated homogeneous colloid and thus, for the first time, it can be assigned to the hydrothermal fulvication process. We discuss diverse valorization schemes depending on the biomass and conditions applied. Underlining chemical pathways of artificial humic substance formation in pH-programmed hydrothermal treatment of waste biomass aiming CO 2 sequestration and soil improvement for sustainable and efficient agricultural processes.
ISSN:2398-4902
2398-4902
DOI:10.1039/d2se01513g