Effective Electro-Fenton Degradation of Reactive Black 5 Dye using Modified Electrode with Cu-Zeolites

Effective Electro-Fenton Degradation of Reactive Black 5 Dye using Modified Electrode with Cu-Zeolites

Miguel A. Oliver-Tolentino Elmer Jiménez-Álvarez María de Jesús Martínez-Ortiz Efrén García-Báez M.Olivia Franco-Hernández Ariel Guzmán-Varga*

Instituto Politécnico Nacional, ESIQIE, Departamento de Ingeniería Química - Laboratorio de Investigación en Materiales Porosos, Catálisis Ambiental y Química Fina, UPALM Edif.7 P.B. Zacatenco, GAM, México, D.F. 07738, México

2Instituto Politécnico Nacional, UPIBI, Departamento de Ciencias Básicas, Av. Acueducto s/n, Barrio La Laguna, Col. Ticomán, GAM, México, D.F. , 07340, México

Corresponding Author Email: 
aguzmanv@ipn.mx, otma_iq@hotmail.com
December 10, 2013
February 08, 2014
April 15, 2014
| Citation

The electrocatalytic production of hydroxyl radical (HO•) on the surface of zeolite modified electrode (ME) employing Cu-Zeolites (ZSM5 and β) with different theoretical ionic exchange (15 and 100%) was investigated (ME/Cu-Zeolites). The i-E characteristic of ME/Cu-ZSM-5 presented the faradic process associated to redox couple Cu2+/Cu+. On the other hand, voltammetric studies showed that in presence of H2O2, the cathodic peak current of ME/Cu-Zeolites increases followed by a decrease in the corresponding anodic current. This suggested that hydroxyl radical was produced by a cooperative effect of the acidic properties of zeolite and copper that acts as a redox mediator on the electrode surface via an electrocatalytic mechanism. Experiments of degradation using azo dye Reactive Black 5 as probe molecule exhibited that the concentration of azo dye decreased in the time, this confirms the formation of hydroxyl radical on the surface of modified electrode; kinetics parameters demonstrated that the ME/Cu- β with 15% of ionic exchange presented the highest catalytic activity.


Hydroxyl radical, electrocatalysis, chemical oxygen demand, Cu-Zeolite, Reactive Black 5

1. Introduction
2. Experimental Section
3. Results and Discussion
4. Conclusion
5. Acknowledgements

CONACYT 101319 and SIP-IPN 20140793 projects, for financial support.


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