Cited by 52NMR spectroscopy and applicationsThermochemical Biomass Conversion ProcessesAdsorption and biosorption for pollutant removal

Mechanisms of Water Interaction with Pore Systems of Hydrochar and Pyrochar from Poplar Forestry Waste

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Conte, Pellegrino, Hanke, Ulrich M., Marsala, Valentina, Cimò, Giulia, Alonzo, Giuseppe, Glaser, Bruno·2014·Journal of Agricultural and Food Chemistry

Abstract

The aim of this study was to understand the water-surface interactions of two chars obtained by gasification (pyrochar) and hydrothermal carbonization (hydrochar) of a poplar biomass. The two samples revealed different chemical compositions as evidenced by solid state (13)C NMR spectroscopy. In fact, hydrochar resulted in a lignin-like material still containing oxygenated functionalities. Pyrochar was a polyaromatic system in which no heteronuclei were detected. After saturation with water, hydrochar and pyrochar were analyzed by fast field cycling (FFC) NMR relaxometry. Results showed that water movement in hydrochar was mainly confined in very small pores. Conversely, water movement in pyrochar led to the conclusion that a larger number of transitional and very large pores were present. These results were confirmed by porosity evaluation derived from gas adsorption. Variable-temperature FFC NMR experiments confirmed a slow-motion regime due to a preferential diffusion of water on the solid surface. Conversely, the higher number of large pores in pyrochar allowed slow movement only up to 50 °C. As the temperature was raised to 80 °C, water interactions with the pore surface became weaker, thereby allowing a three-dimensional water exchange with the bulk liquid. This paper has shown that pore size distribution was more important than chemical composition in affecting water movement in two chemically different charred systems.

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Crossref · 10.1021/jf5010034

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Authors
Conte, P., Hanke, U. M., Marsala, V., Cimò, G., Alonzo, G., & Glaser, B.
Affiliations
  • University of Palermo (IT)
  • Martin Luther University Halle-Wittenberg (DE)
Corresponding author
Conte, Pellegrino
Venue
Journal of Agricultural and Food Chemistry
Published
2014-05-14
Volume
62
Issue
21
Pages
4917-4923
ISSN
  • 0021-8561 (ISSN-L)
  • 1520-5118
OpenAlex
W2036164016
Cited by
52
References
39
Citations by year
2026: 2 · 2025: 5 · 2024: 2 · 2023: 5 · 2022: 4 · 2021: 6 · 2020: 4 · 2019: 7 · 2018: 2 · 2017: 4 · 2016: 3 · 2015: 6 · 2014: 2
FWCI
2.20
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Journal of Agricultural and Food Chemistry (publishedVersion)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, other-oa)
  • Nova Science Publishers (Nova Science Publishers, Inc.) (submittedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, other-oa)
  • Zurich Open Repository and Archive (University of Zurich)
Topics
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › NMR spectroscopy and applications
  • Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
Keywords
hydrochar, pyrochar, poplar biomass, water sorption, pore size distribution, water diffusion, fast field cycling NMR, biomass gasification, hydrothermal carbonization, porosity
MeSH terms
Charcoal, Magnetic Resonance Spectroscopy, Temperature, Waste Products, Water, Porosity, Forestry, Populus

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