Especiação e quimissorção de Pb(II) em rejeito de caulim
| Data(s) |
03/10/2014
03/10/2014
2013
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| Resumo |
This study assesses the adsorption of Pb(II) on natural kaolin waste (KR<sub>natural</sub>) and on that treated with 3 mol L<sup>-1</sup> H<sub>2</sub>SO<sub>4</sub> and HCl. Equilibrium and thermodynamic parameters were determined. The results indicate that the values of CEC, specific area and SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratio (4.6-6.0 cmol kg<sup>-1</sup>, 14.0-16.0 m² g<sup>-1</sup> and 1.16-1.30, respectively) vary only slightly for the adsorbents; the concentration of Pb<sup>2+</sup> is much higher than that of other species (PbOH<sup>+</sup> and Pb(OH) <sub>2</sub>). The values of R<sub>L</sub>, ΔGº, ΔHº and ΔSº are typical of feasible, spontaneous, exothermic and ordered adsorption. The chemisorption on KR<sub> natural </sub> is more feasible and ordered. |
| Identificador |
PINHEIRO, Marta Helena Tavares et al. Especiação e quimissorção de Pb(II) em rejeito de caulim. Química Nova, São Paulo, v. 36, n. 2, p. 272-278, 2013. Disponível em: <http://www.scielo.br/pdf/qn/v36n2/v36n2a13.pdf>. Acesso em: 18 jun. 2014. <http://dx.doi.org/10.1590/S0100-40422013000200013>. 0100-4042 |
| Idioma(s) |
por |
| Direitos |
Open Access |
| Palavras-Chave | #Adsorção #Caulim #Caulinita #Chumbo #Especiação (Química) |
| Tipo |
article |
