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Journal of Materials Science

, Volume 54, Issue 5, pp 3761–3777 | Cite as

Observation of the transformation of silica phytoliths into SiC and SiO2 particles in biomass-derived carbons by using SEM/EDS, Raman spectroscopy, and XRD

  • Enrique R. Yapuchura
  • Rodolfo S. Tartaglia
  • Alfredo G. Cunha
  • Jair C. C. Freitas
  • Francisco G. Emmerich
Ceramics
  • 91 Downloads

Abstract

Scanning electron microscopy coupled to energy-dispersive X-ray spectroscopy, Raman spectroscopy, and X-ray diffraction were successfully used to observe the location and morphology of the silica phytoliths in biomass-derived carbons and their transformation into SiC and SiO2 particles at high heat treatment temperatures (HTT). The analyses were conducted in chars derived from the endocarp of babassu coconut (EBC), which naturally contains 1.6 wt% of silica in its mineral matter. It was observed that EBC chars with 500–1200 °C HTT present globular echinate SiO2 phytoliths with sizes of 12–16 μm; these phytoliths are mostly concentrated around the surface of the submillimeter char fibers and also in the carbonaceous char matrix. No phytoliths are found in the interior of the char fibers. At 1200 °C HTT, the phytoliths begin to be rounded, and above 1300 °C HTT, most phytoliths decompose and silicon reacts with carbon-forming nanocrystalline β-SiC particles (~ 35 nm crystallite size). Numerous (tens to hundreds) micro- and sub-micro-amorphous or nanostructured SiO2 particles (with sizes predominantly below 2 µm) are then observed at the sites previously occupied by the phytoliths. Few rounded phytoliths survive at 1400 °C HTT, but disappear at higher HTTs (1600–2000 °C). It is likely that the ensembles of micro- and sub-micro-SiO2 particles observed in many sites correspond to the inner remaining part of the original phytoliths, whose most external SiO2 structures (at and near the surface) decompose and take part in the carbothermal reaction for the formation of SiC.

Notes

Acknowledgements

The support from the Brazilian agencies CNPq, CAPES, FINEP, and FAPES is gratefully acknowledged. The use of the facilities of the Laboratory for Research and Development of Methodologies for Crude Oil Analysis (LabPetro/UFES) in the Raman spectroscopy experiments is gratefully acknowledged. The valuable comments of the anonymous reviewers are also acknowledged.

Compliance with ethical standards

Conflict of interest

There are no conflicts to declare.

Supplementary material

10853_2018_3130_MOESM1_ESM.pdf (393 kb)
Supplementary material 1 (PDF 394 kb)

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Authors and Affiliations

  1. 1.Laboratory of Carbon and Ceramic Materials, Department of PhysicsFederal University of Espirito SantoVitóriaBrazil

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