Obtaining high purity silica from rice hulls

Química Nova

Universidade de São Paulo, São Carlos, Brasil¹  Silva, Marcos A. Segatto¹  Universidade Federal de Santa Catarina, Florianópolis, Brasil¹  Silva Júnior, José da¹  Cunha, Carlo R. da¹  Oliveira, Paulo R.¹  Rodrigues Filho, Ubirajara P.¹  Carvalho, Flávio L. S. de¹ 

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 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】

Unknown