Authors: Cortés-Martínez, Raúl; Solache-Ríos, Marcos; Martínez-Miranda, Verónica; Alfaro-Cuevas V., Ruth

Source: Water, Air, and Soil Pollution, Volume 183, Numbers 1-4, July 2007 , pp. 85-94(10)

Publisher: Springer

Abstract:

The removal of 4-chlorophenol from aqueous solutions by both a Mexican clinoptilolite-heulandite zeolitic rock and the modified zeolitic material with the surfactant hexadecyltrimethylammonium bromide (HDTMABr), using batch and packed-bed (column) configurations, was investigated. The unmodified zeolitic rock did not show any adsorption of 4-chlorophenol. The effects of pH, contact time and concentration of 4-chlorophenol on the adsorption process by the surfactant modified material were examined. The sorption of 4-chlorophenol was not affected by the pH range from 4 to 9.5. 4-chlorophenol retention reached equilibrium in about 18 h and the rate of 4-chorophenol adsorption by the modified material was faster in the first 10 h than later. The experimental data were treated with the models: pseudo-first order, pseudo-second order, fractional power and Elovich models. Although, the last three gave correlation coefficients higher than 0.96, the pseudo-second order model was the best to describe the reaction rate. The experimental data follow a linear isotherm which is characteristic for sorption of organic solutes by the partition mechanism. The Bed Depth-Service Time Model was applied to the sorption results in order to model the column operation. The results showed that the surfactant modified zeolitic rock could be considered as a potential adsorbent for 4-chlorophenol removal from aqueous solutions.

Keywords: 4-chlorophenol; isotherms kinetics; zeolite

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s11270-007-9358-4

Affiliations: 1: Email: msr@nuclear.inin.mx

Publication date: 2007-07-01

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