Especiação e quimissorção de Pb(II) em rejeito de caulim

Química Nova

Marta Helena Tavares Pinheiro²  Vanda Porpino Lemos²  Kelly Das G. Fernandes Dantas²  Taynara Lima Valentim¹ 

[1] ,Universidade Federal do Pará Faculdade de Química Instituto de Ciências Exatas e NaturaisBelém PA ,Brasil

关键词: lead;    kaolinite;    adsorption;   

DOI  :  10.1590/S0100-40422013000200013

来源: SciELO

【 摘 要 】

This 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 R L, ΔGº, ΔHº and ΔSº are typical of feasible, spontaneous, exothermic and ordered adsorption. The chemisorption on KRnatural is more feasible and ordered.

【 授权许可】

CC BY-NC   
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