Adsorção de íons Cu2+ em latossolo vermelho-amarelo húmico

Show simple item record Jordão, Cláudio Pereira Alves, Neusa Maria Pereira, José Luiz Bellato, Carlos Roberto Alvarez V., Victor Hugo 2019-05-20T23:59:00Z 2019-05-20T23:59:00Z 2000-01
dc.identifier.issn 16787064
dc.description.abstract 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. en
dc.format pdf pt-BR
dc.language.iso por pt-BR
dc.publisher Química Nova pt-BR
dc.relation.ispartofseries v. 23, n. 01, p. 05- 11, jan./ feb. 2000 pt-BR
dc.rights Open Access pt-BR
dc.subject Copper pt-BR
dc.subject Adsorption pt-BR
dc.subject Oxisol pt-BR
dc.title Adsorção de íons Cu2+ em latossolo vermelho-amarelo húmico pt-BR
dc.type Artigo pt-BR

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