Obtaining high purity silica from rice hulls

Química Nova

José Da Silva Júnior²  Carlo R. Da Cunha²  Flávio L. S. De Carvalho¹  Ubirajara P. Rodrigues Filho¹  Paulo R. Oliveira¹  Marcos A. Segatto Silva¹ 

[1] ,Universidade Federal de Santa Catarina Departamento de Engenharia Elétrica Florianópolis SC ,Brasil

关键词: rice hulls;    silica;    leaching;   

DOI  :  10.1590/S0100-40422010000400005

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License