Lead(II) removal in discontinous systems by carbon activated by phosphoric acid and vapor

Author(s)

Cristiane Imenes de Campos Bueno ^[1] ; Wagner Alves Carvalho ^[2]

Affiliation

^[1] Pontifícia Universidade Católica de Campinas. Centro de Ciências Exatas, Ambientais e de Tecnologias. Faculdade de Química - Brasil

^[2] Pontifícia Universidade Católica de Campinas. Centro de Ciências Exatas, Ambientais e de Tecnologias. Faculdade de Química - Brasil

• Document type: Journal article
• Source: Química Nova; v. 30, n. 8, p. 1911-1918, 2007-00-00.

Abstract

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. (AU)

• FAPESP's process: 05/04342-7 - Evaluation of lead (II) retention by phosphoric acid and steam activated carbons
• Grantee: Cristiane Imenes de Campos Bueno Zanin
• Support Opportunities: Scholarships in Brazil - Scientific Initiation