APPLICATIONS OF BRAZILIAN ILLITE-KAOLINITE IN NATURAL AND INTERCALATED FORMS AS ADSORBENTS TO REMOVAL OF ZINC FROM AQUEOUS SOLUTIONS: KINETIC AND THERMODYNAMIC STUDIES
The capability of natural and modified-Illite/kaolinite for zinc adsorption from aqueous solution was investigated in the present paper. The new hybrid material was composed of the natural clay using the intercalation process with dimethyl sulfoxide. The objective of this study was to examine the adsorption behavior of Brazilian phyllosilicate sample and hybrid material, towards a divalent metal has been studies by a batch technique. The phyllosilicate sample and hybrid material were characterized by x-ray diffractometry (XRD) and elemental analysis. The Avrami, Lagergren, Elovich, and Intra-particle diffusion models for adsorption isotherms were applied for analyses experimental data in order to determine the adsorption capacity to form a monolayer and the constant related to the adsorption intensity. The adsorption equilibrium was established in 140 minutes for natural and 120 minutes for modified clay. The maximum number of moles adsorbed was determined to be 12.55 and 22.89 mmolg-1 for systems Zn²+-(kaolinite/ilite) and Zn²+-(kaolinite/ilite + dimethyl sulfoxide), respectively.
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedad Chilena de Química
2013
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| Online Access: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072013000200007 |
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