Obtaining high purity silica from rice hulls

Quimica nova

Silva, Marcos A. Segatto¹  Silva Júnior, José da¹  Cunha, Carlo R. da¹  Oliveira, Paulo R.¹  Rodrigues Filho, Ubirajara P.²  Carvalho, Flávio L. S. de² 

[1] Universidade Federal de Santa Catarina, Florianópolis, Brasil;Universidade de São Paulo, São Carlos, Brasil

关键词: rice hulls;    silica;    leaching.;   

DOI  :  10.1590/S0100-40422010000400005

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Many routes forextracting silica from rice hulls are based on direct calcining. These methods,though, often produce silica contaminated with inorganic impurities. This workpresents the study of a strategy for obtaining silica from rice hulls with apurity level adequate for applications in electronics. The technique is basedon two leaching steps, using respectively aqua regia and Piranha solutions,which extract the organic matrix and inorganic impurities. The material wascharacterized by Fourier-transform infrared spectroscopy (FTIR), powder x-raydiffraction (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