Preparation and characterization of chemically activated carbon from rice hulls

被引：24

作者：

Schettino, Miguel A., Jr. ^{[1
]}

Freitas, Jair C. C.

Cunha, Alfredo G.

Emmerich, Francisco G.

Soares, Ana B.

Silva, Paulo R. N.

机构：

[1] Univ Fed Espirito Santo, Dept Fis, BR-29075 Vitoria, ES, Brazil

[2] Univ Estadual N Fluminense, Ctr Ciencia Tecnol, BR-28015620 Campos Dos Goytagazes, RJ, Brazil

来源：

QUIMICA NOVA | 2007年 / 30卷 / 07期

关键词：

activated carbons; rice hulls; chemical activation;

D O I：

10.1590/S0100-40422007000700031

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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 m(2)/g achieved for the samples activated at 800 degrees C starting from the precursor with or without silica, respectively.

引用

页码：1663 / 1668

页数：6

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