TY - JOUR
T1 - Effective electro-fenton degradation of reactive black 5 dye using modified electrode with Cu-zeolites
AU - Oliver-Tolentino, Miguel A.
AU - Jiménez-Álvarez, Elmer
AU - De Jesús Martínez-Ortiz, María
AU - García-Báez, Efrén
AU - Franco-Hernández, M. Olivia
AU - Guzmán-Vargas, Ariel
PY - 2014
Y1 - 2014
N2 - 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 H2O 2, 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.
AB - 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 H2O 2, 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.
KW - Chemical oxygen demand
KW - Cu-Zeolite
KW - Electrocatalysis
KW - Hydroxyl radical
KW - Reactive black 5
UR - http://www.scopus.com/inward/record.url?scp=84940258147&partnerID=8YFLogxK
U2 - 10.14447/jnmes.v17i2.426
DO - 10.14447/jnmes.v17i2.426
M3 - Artículo
SN - 1480-2422
VL - 17
SP - 71
EP - 75
JO - Journal of New Materials for Electrochemical Systems
JF - Journal of New Materials for Electrochemical Systems
IS - 2
ER -