Química Nova | |
Preparação e caracterização de carvão ativado quimicamente a partir da casca de arroz | |
Miguel A. Schettino Jr.2  Jair C. C. Freitas2  Alfredo G. Cunha2  Francisco G. Emmerich2  Ana B. Soares1  Paulo R. N. Silva1  | |
[1] ,Universidade Federal do Espírito Santo Departamento de Física Vitória ES ,Brasil | |
关键词: activated carbons; rice hulls; chemical activation; | |
DOI : 10.1590/S0100-40422007000700031 | |
来源: SciELO | |
【 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】
CC BY-NC
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
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