Obtaining high purity silica from rice hulls

José Da Silva, Carlo R. Da Cunha, Flávio L.S. De Carvalho, Ubirajara P. Rodrigues Filho, Paulo R. Oliveira, Marcos A. Segatto Silva

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Many routes for extracting silica from rice hulls are based on direct calcining. These methods, though, often produce silica contaminated with inorganic impurities. This work presents the study of a strategy for obtaining silica from rice hulls with a purity level adequate for applications in electronics. The technique is based on two leaching steps, using respectively aqua regia and Piranha solutions, which extract the organic matrix and inorganic impurities. The material was characterized by Fourier-transform infrared spectroscopy (FTIR), powder x-ray diffraction (XRD), x-ray fluorescence (XRF), scanning electron microscopy (SEM), particle size analysis by laser diffraction (LPSA) and thermal analysis.

Original languageEnglish (US)
Pages (from-to)794-797
Number of pages4
JournalQuimica Nova
Volume33
Issue number4
DOIs
StatePublished - 2010
Externally publishedYes

Keywords

  • Leaching
  • Rice hulls
  • Silica

ASJC Scopus subject areas

  • General Chemistry

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