Removal of Cadmium(II) and Lead(II) ions from aqueous phase on sodic bentonite

Materials Research

Luz Stella Gaona Galindo¹  Ambrósio Florêncio De Almeida Neto¹  Meuris Gurgel Carlos Da Silva¹  Melissa Gurgel Adeodato Vieira¹ 

[1] ,University of Campinas School of Chemical Engineering Department of Processes and Products DesignCampinas SP ,Brazil

关键词: adsorption;    bentonite clay;    lead;    cadmium;   

DOI  :  10.1590/S1516-14392013005000007

来源: SciELO

【 摘 要 】

This paper describes the adsorption of Cd2+and Pb2+ions using sodic bentonite clay type Fluidgel modified. The Fluidgelbefore and after chemical modification and thermal activation was characterized by different techniques including X-ray diffraction, thermal analysis, Fourier transform infrared, surface area, helium pycnometry, cation exchange capacity and scanning electron microscopy. Pseudo-first order, pseudo-second order and intra-particle diffusion models were used to analyze the kinetic curves. Equilibrium data were analyzed using Langmuir and Freundlich models. The thermodynamic study indicated that lead adsorption process is endothermic and interactions between clays and solutions of lead occurred spontaneously, while cadmium adsorption revealed an exothermic and spontaneous nature. The maximum removal efficiencies were 97.62% for Cd(II) using Fluidgelmodified chemically and 91.08% for lead by Fluidgel modified chemical and thermally.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License