Preparation and characterization of chemically activated carbon from rice hulls

Química Nova

Emmerich, Francisco G.¹  Soares, Ana B.¹  Cunha, Alfredo G.¹  Universidade Federal do Espírito Santo, Vitória, Brasil¹  Silva, Paulo R. N.¹  Schettino Jr., Miguel A.¹  Freitas, Jair C. C.¹  Universidade Estadual do Norte Fluminense, Campos dos Goytagazes, Brasil¹ 

关键词: activated carbons;    rice hulls;    chemical activation.;   

DOI  :  10.1590/S0100-40422007000700031

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

This work consists in a study about the chemical activation of charred rice hulls using NaOH as the activation agent. The influence of the naturally-occurring silica was particularly evidenced. X-ray diffraction patterns showed the formation of sodium carbonate and silicates in the activated samples, whereas thermogravimetric curves revealed a strong reduction in the ash content of these samples after washing with water. Nitrogen adsorption data indicated a microporosity development only in the washed samples, with BET surface area values of 450 and 1380 m2/g achieved for the samples activated at 800 °C starting from the precursor with or without silica, respectively.

【 授权许可】

Unknown