Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/70886
Type: Artigo de periódico
Title: Removal of Cadmium(II) and Lead(II) Ions from Aqueous Phase on Sodic Bentonite
Author: Galindo, LSG
Neto, AFD
da Silva, MGC
Vieira, MGA
Abstract: This paper describes the adsorption of Cd2+ and Pb2+ ions using sodic bentonite clay type Fluidgel modified. The Fluidgel before 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 Fluidgel modified chemically and 91.08% for lead by Fluidgel modified chemical and thermally.
Subject: adsorption
bentonite clay
lead
cadmium
Country: Brasil
Editor: Univ Fed Sao Carlos, Dept Engenharia Materials
Rights: aberto
Identifier DOI: 10.1590/S1516-14392013005000007
Date Issue: 2013
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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