Artículos de revistas
Kinetics And Modified Clay Thermodynamic From The Brazilian Amazon Region For Lead Removal
Registro en:
Journal Of Hazardous Materials. , v. 159, n. 2-3, p. 412 - 419, 2008.
3043894
10.1016/j.jhazmat.2008.02.032
2-s2.0-53149147810
Autor
Guerra D.L.
Airoldi C.
Institución
Resumen
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. 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