2014-10-032014-10-032013PINHEIRO, 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>.0100-4042https://repositorio.ufpa.br/handle/2011/5826This study assesses the adsorption of Pb(II) on natural kaolin waste (KRnatural) and on that treated with 3 mol L-1 H2SO4 and HCl. Equilibrium and thermodynamic parameters were determined. The results indicate that the values of CEC, specific area and SiO2/Al2O3 ratio (4.6-6.0 cmol kg-1, 14.0-16.0 m² g-1 and 1.16-1.30, respectively) vary only slightly for the adsorbents; the concentration of Pb2+ is much higher than that of other species (PbOH+ and Pb(OH) 2). The values of RL, ΔGº, ΔHº and ΔSº are typical of feasible, spontaneous, exothermic and ordered adsorption. The chemisorption on KR natural is more feasible and ordered.porAcesso AbertoAdsorçãoCaulimCaulinitaChumboEspeciação (Química)Artigo de Periódico