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Journal of Chemistry
Volume 2017, Article ID 5184590, 14 pages
https://doi.org/10.1155/2017/5184590
Research Article

Electrocoagulation-Adsorption to Remove Anionic and Cationic Dyes from Aqueous Solution by PV-Energy

Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón y Tollocan s/n, 50000 Toluca, MEX, Mexico

Correspondence should be addressed to T. Pavón-Silva; moc.liamg@novap.ht

Received 13 December 2016; Revised 5 April 2017; Accepted 11 July 2017; Published 21 August 2017

Academic Editor: Davide Vione

Copyright © 2017 J. Castañeda-Díaz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The cationic dye malachite green (MG) and the anionic dye Remazol yellow (RY) were removed from aqueous solutions using electrocoagulation-adsorption processes. Batch and continuous electrocoagulation procedures were performed and compared. Carbonaceous materials obtained from industrial sewage sludge and commercial activated carbons were used to adsorb dyes from aqueous solutions in column systems with a 96–98% removal efficiency. The continuous electrocoagulation-adsorption system was more efficient for removing dyes than electrocoagulation alone. The thermodynamic parameters suggested the feasibility of the process and indicated that the adsorption was spontaneous and endothermic ( and −0.009 for MG and RY, resp.). The value further indicated that the adsorption process was spontaneous (−6.31 and −10.48;  K). The kinetic electrocoagulation results and fixed-bed adsorption results were adequately described using a first-order model and a Bohart-Adams model, respectively. The adsorption capacities of the batch and column studies differed for each dye, and both adsorbent materials showed a high affinity for the cationic dye. Thus, the results presented in this work indicate that a continuous electrocoagulation-adsorption system can effectively remove this type of pollutant from water. The morphology and elements present in the sludge and adsorbents before and after dye adsorption were characterized using SEM-EDS and FT-IR.