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| Titel |
The effect of different chemical treatments, pyrolysis conditions and feedstocks on the redox properties of biochar. |
| VerfasserIn |
Francisco Javier Chacón, Maria Luz Cayuela, Asunción Roig, Miguel Ángel Sánchez-Monedero |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250145599
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| Publikation (Nr.) |
 EGU/EGU2017-9556.pdf |
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| Zusammenfassung |
| Pyrogenic carbonaceous materials can have a role in several biogeochemical redox reactions
as electron transfer catalysts. Low N2O emissions in biochar amended soils can be related to
its ability to act as an “electron shuttle”, facilitating the transport of electrons to soil
denitrifying microorganisms. Modifying biochar redox properties could be an interesting
approach to regulate this effect.
In this work we propose several methods for the development of biochars from slow
pyrolysis with altered electrochemical properties. To improve its electron exchange capacity
we aimed to:
1) Increase the number of redox active functional groups in biochar. Several pyrolysis
conditions and chemical treatments (KOH, H3PO4 and H2O2) were tested.
2) Raise the fraction of redox active mineral in biochar. The presence of Fe and Mn-based
minerals in biochar could also catalyze redox reactions in soil associated with the nitrogen
cycle. Different additives (FeCl3, KMnO4 and clay) were combined with the feedstock before
the pyrolysis process.
Results of their ability to modify biochar redox properties, measured by mediated
electrochemical analysis, are presented. Additionally, we characterized biochars produced
from different feedstocks to assess how their lignin, holocellulose and ash composition
affects these properties. Analytical issues arising from the difficulty of measuring the electron
exchange capacity of biochar will also be discussed. |
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