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| Titel |
Production and characterization of carbonized sorbent products optimized for
anionic contaminants |
| VerfasserIn |
Eva Viglasova, Vladimir Fristak, Michal Galambos, Rebecca Hood-Nowotny, Gerhard Soja |
| 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 |
250148202
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| Publikation (Nr.) |
 EGU/EGU2017-12438.pdf |
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| Zusammenfassung |
| Processing conditions, production methods and feedstock characteristics have been shown to
affect the final sorption properties of biochar-based sorbents that have been produced in
pyrolysis reactors. The content of O-containing carboxyl, phenolic and hydroxyl functional
groups on the biochar surfaces plays a crucial role in sorption chemistry of hazardous
materials. The sorption process can be affected by the presence of non-carbonized fractions in
biochar matter as well. All these characteristics indicate that biochar shows good potential as
a new tool in removal and separation technologies of various pollutants from waste water or
contaminated soils.
The sorption potential of wood-based biochars for cationic forms of heavy metals has
been studied intensively and has already led to successful pilot applications in the field.
However, anionic compounds (e.g. phosphate, nitrate, sulphate, As-, Cr-compounds)
do not sorb well to unmodified biochar and need specific surface modification of
biochar.
Based on this fact, we try to obtain data about the sorptive separation of anionic forms of
various contaminants from model aqueous solutions by different types of biochar-derived
sorbents, or mineral-enriched biochar-derived sorbents. An important part of this
research is the assesment of the effects of varying process parameters during biomass
carbonisation, the role of biomass feedstock and pre-and/or post-treatment of the biochars
onto sorption processes. We specify the most appropriate application strategies
with biochar for remediation purposes of waste water or contaminated waters with
elevated toxic metal concentrations that might compromise the quality of surface
waters. The main aim of research is the preparation of modified biochar sorbent, the
characterization of its surface and the investigation about new possibilities of modified
biochar sorbent applications for sorption of various contaminants, mainly their anionic forms
(e.g. phosphates, nitrates, arsenates). Modification of bamboo-based biochar with
clay minerals, the preparation of its composites, could increase the surface area of
bamboo-based biochar from 3 to 5 times. Other ways of modification e.g. by using
FeCl3 ⋅ 6H2O caused a significant increase of sorption ability for anionic forms |
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