Adsorção de íons Cu2+ em latossolo vermelho-amarelo húmico
In environmental studies it is necessary to know the adsorption behavior of metals by soils, since the unfavorable effects of heavy metals and even the micronutrients at high concentrations in the environment are related to these adsorbents' ability to immobilize them. A sample of a humic yellow red oxisol from Araponga region in the State of Minas Gerais, Brazil, was used to verify the adsorption behavior of Cu2+ ions in this substrate. The mathematical model described by Langmuir's adsorption equation in its linearized form was applied and the values of the maximum capacity b and those of the constant related to the bonding energy a were obtained. Aliquots of copper nitrate solutions containing several concentrations of this metal were added to soil samples, the pH being predetermined for developing the adsorption experiments. The chemical and physical characterization of soil sample were performed by determining the organic carbon, nitrogen and phosphorus concentrations, cation exchange capacity (CEC), pH, concentration of metals (Al, Fe, K, Mg, Ca, Zn, Cu, Ni, Cr, Co, Pb, and Cd), granulometric analysis and X-ray diffraction. Langmuir isotherms presented two distinct adsorption regions at both pH 4 and pH 5, showing that the adsorptive phenomenon occurs in two distinct stages. The adsorption sites for the lower part presented greater bonding energy and low adsorption capacity compared with the adsorption sites of the part of the curve corresponding to higher Cu concentrations in the equilibrating solution.
Main Authors: | Jordão,Cláudio Pereira, Alves,Neusa Maria, Pereira,José Luiz, Bellato,Carlos Roberto, Alvarez V.,Victor Hugo |
---|---|
Format: | Digital revista |
Language: | Portuguese |
Published: |
Sociedade Brasileira de Química
2000
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422000000100002 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Adsorção e lixiviação de boro em Latossolo Vermelho-Amarelo
by: Rosolem,Ciro Antonio, et al.
Published: (2007) -
Adsorção de Cu e Zn num Latossolo Vermelho tratado com dejetos suínos
by: Lopes,Claudia, et al.
Published: (2014) -
Capacidade de adsorção de fósforo em latossolo amarelo e podzólico vermelho-amarelo da Amazônia Oriental.
by: BRASIL, E. C., et al.
Published: (2014-02-05) -
Adsorption of Cu2+ ions on humic acids
by: Jordão,Cláudio Pereira, et al.
Published: (2001) -
Variabilidade espacial de atributos químicos de um Latossolo Vermelho-Amarelo húmico cultivado com café
by: Silva,Samuel de Assis, et al.
Published: (2010)