Remoção de chumbo(II) em sistemas descontínuos por carvões ativados com ácido fosfórico e com vapor

Química Nova

Cristiane Imenes De Campos Bueno¹  Wagner Alves Carvalho¹ 

[1] ,Pontifícia Universidade Católica de Campinas Centro de Ciências Exatas, Ambientais e de Tecnologias Faculdade de QuímicaCampinas SP ,Brasil

关键词: adsorption;    activated carbon;    lead(II);   

DOI  :  10.1590/S0100-40422007000800022

来源: SciELO

【 摘 要 】

Adsorption of heavy metal cations by activated carbon is dependent on the capacity of the material in promoting adsorption and the time needed to reach equilibrium. Carbon samples were previously activated either by phosphoric acid treatment at 400 ºC or by steam at 800 ºC. The results of Pb(II) adsorption by these activated carbons have shown that equilibrium was typically reached within the first 5 min of contact between carbon and metal solution, with a maximum adsorption capacity higher than 69 mg g-1 for the vapor-activated sample. Temperature influences the sorption capacity, which corresponds to an endothermic process. Lead(II) retention is more pronounced at high temperature and low pH.

【 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