Preparação e caracterização de carvão ativado quimicamente a partir da casca de arroz

Química Nova

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】

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