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Type: Artigo de periódico
Title: Kinetics and modified clay thermodynamic from the Brazilian amazon region for lead removal
Author: Guerra, DL
Airoldi, C
Abstract: Modified Brazilian smectite-bearing clay samples displayed ability for lead adsorption. The structure modification of smectite were obtained through pillaring process and functionalization with [3-(2-aminoethylamino)propyl]trimethoxysilane. The chemical modification process increases the basal spacing of the natural smectite from 1.354 to 2.364 nm. The Langmuir model was fitted to experimental data in linear regression. Kinetic studies showed an equilibrium adsorption time of 700 min on the modified clay. The experimental data were correlated with two distinct kinetic models were used: (i) external mass transfer diffusion and (ii) intraparticular mass transfer diffusion. However, the intraparticle mass transfer diffusion model gave a better fit to these experimental data. The energetic effects caused by lead interactions were determined through calorimetric titration at the solid-liquid interface and gave a net thermal effect that enabled the calculation of the exothermic values and the equilibrium constant. (C) 2008 Published by Elsevier B.V.
Subject: Ceramic
Surface property
Inorganic compound
Thermodynamic property
Country: Holanda
Editor: Elsevier Science Bv
Citation: Journal Of Hazardous Materials. Elsevier Science Bv, v. 159, n. 41700, n. 412, n. 419, 2008.
Rights: fechado
Identifier DOI: 10.1016/j.jhazmat.2008.02.032
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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