Comparative study of silica obtained from acid leaching of rice husk and the silica obtained by thermal treatment of rice husk ash

Química Nova

Della, Viviana Possamai¹  Universidade Federal de Santa Catarina, Florianópolis, Brasil¹  Junkes, Janaína Accordi¹  Oliveira, Antonio Pedro Novaes de¹  Hotza, Dachamir¹ 

关键词: silica;    rice husk;    acid leaching.;   

DOI  :  10.1590/S0100-40422006000600005

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A comparison between silica by acid leaching of rice husk (RH) and silica obtained from thermal treatment of rice husk ash (RHA) is presented. The best leaching results were obtained using 10% hydrochloric acid followed by washing with water. The alternative method, calcination of RHA at 700 ºC for 6 h followed by grinding for 80 min, was more effective. Silica obtained from RH was about 97% amorphous, had a 17.37 µm mean particle size, and a specific surface area of 296 m2/g. On the other hand, for silica obtained from RHA the values were about 95% amorphous material 0.68 µm, and 81 m2/g.

【 授权许可】

Unknown