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Published in: Adsorption 1/2018

30-11-2017

Chromium adsorption into a macroporous resin based on vinylpyridine–divinylbenzene copolymers: thermodynamics, kinetics, and process dynamic in a fixed bed column

Authors: José Antonio Arcos-Casarrubias, Martín R. Cruz-Díaz, Judith Cardoso-Martínez, Jorge Vázquez-Arenas, Francisco Vidal Caballero-Domínguez

Published in: Adsorption | Issue 1/2018

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Abstract

The synthesis of the poly(4-vinylpyridine-co-ethylvinylbenzene) resin is investigated and its performance to remove Cr(VI) from aqueous solutions is evaluated as a function of pH using batch and fixed bed column adsorptions. The rate of Cr(VI) removal is observed to increase as the pH solution shifts to acidic conditions due to an enhanced protonation of the 4-vinylpyridine group in the polymer, which favors its electrostatic attraction with Cr(VI) oxyanions. This finding is supported with Density Functional Theory (DFT) calculations, revealing that the interaction between \({\text{CrO}}_{4}^{{2 - }}\) (predominant species at pH < 6) and protonated 4VP is more favorable than a bond formed with \({\text{HCrO}}_{4}^{ - }\) species (pH > 6) due to a higher charge delocalization arising in the O atoms. Experimental isotherms are approximated with the Langmuir and Radke-Prausnitz adsorption models. This former approach generates the best fitting to the data, whereby it was incorporated into a nonlinear transient model to account for the Cr(VI) adsorption in a fixed bed, and evaluating its capacity to predict experimental adsorption data. The model enables to infer that the resin presents a fast kinetic for Cr(VI) sorption, and the Cr(VI) intra-particle diffusion across the adsorbent pores is the rate-determining step for sorption.

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Metadata
Title
Chromium adsorption into a macroporous resin based on vinylpyridine–divinylbenzene copolymers: thermodynamics, kinetics, and process dynamic in a fixed bed column
Authors
José Antonio Arcos-Casarrubias
Martín R. Cruz-Díaz
Judith Cardoso-Martínez
Jorge Vázquez-Arenas
Francisco Vidal Caballero-Domínguez
Publication date
30-11-2017
Publisher
Springer US
Published in
Adsorption / Issue 1/2018
Print ISSN: 0929-5607
Electronic ISSN: 1572-8757
DOI
https://doi.org/10.1007/s10450-017-9925-y

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