Centro de Investigación y Desarrollo Tecnológico en Electroquímica

About: Centro de Investigación y Desarrollo Tecnológico en Electroquímica is a based out in . It is known for research contribution in the topics: Cyclic voltammetry & Catalysis. The organization has 537 authors who have published 682 publications receiving 10382 citations. The organization is also known as: Centro de Investigacion y Desarrollo Tecnologico en Electroquimica & Center of Research and Technologic Development in Electrochemistry.

Evaluación electroquímica de nanoestructuras Fe/MWCNT-Pt y Fe/MWCNT-Pt-Pd como materiales de cátodos multifuncionales con potencial aplicación en el mejoramiento de la calidad de agua tratada

Abstract: En este articulo se presenta una estrategia de evaluacion electroquimica para materiales nanoestructurados con potencial uso en catodos multifuncionales, con el fin de incrementar la capacidad de degradacion y eliminacion de materia organica recalcitrante en agua tratada por via electroquimica. El principal objeto de estudio es la produccion de radical hidroxilo (•OH), que es identificado como un agente altamente oxidante (2.8 V vs. ENH), unicamente superado por el fluor (3.03 v vs. ENH). Este radical suele formarse en la superficie de un anodo catalitico o por reacciones tipo Fenton; sin embargo, en este articulo se demuestra que es factible su formacion en un catodo, asemejando el proceso de oxidacion avanzada (AOP), conocido como electro-Fenton. La elevada reactividad del •OH para llevar a cabo la destruccion de compuestos biorrefractarios y recalcitrantes esta plenamente probada y justifica la propuesta de ensayar materiales nanoestructurados para multiplicar su produccion en una celda electroquimica. La evaluacion de catodos de tipo multifuncional, conteniendo Pt y Pt-Pd, soportados sobre nanotubos de carbon multipared (MWCNT) se realizo por voltamperometria ciclica, para determinar la produccion in-situ del radical •OH. De esta manera, el desarrollo de un nuevo proceso de reduccion electroquimica de tipo multifuncional (O₂ a H₂O₂ y H₂O₂ a •OH) tiene una potencial aplicacion en celdas electroquimicas ya concebidas para mejorar la calidad de agua tratada.

NMR and Raman Spectroscopic Studies of 4-Phenyl-3-buten-2-one Dissolved in an Electroplating Zinc Bath

Abstract: Raman, IR and NMR spectra were measured in order to elucidate the role of 4-phenyl-3-buten-2-one in zinc electroplating. First, solutions of this compound dissolved in methanol and methanol/water mixtures were studied. NMR data show that the solvation was caused by Van der Waals forces. Density functional theory calculations were performed to support vibrational wavenumber assignments of the observed bands. The studied SVWN/DN** basis set shows good agreement with the experimental results. Additionally, Raman spectra of 4-phenyl-3-buten-2-one dissolved in an electroplating bath were obtained and a red shift was observed of the carbonyl group. This effect was explained as a result of the packing density of the investigated molecule modified in the electroplating bath. No complex was detected between zinc and 4-phenyl-3-buten-2-one.

Preparation and study of cellulose acetate membranes modified with linear polymers covalently bonded to Starburst polyamidoamine dendrimers

Abstract: Novel ion-selective membranes were prepared by means of the noncovalent modification of a cellulose acetate (CA) polymer with either poly(ethylene-alt-maleic anhydride) or poly(allylamine hydrochloride) chains covalently linked to Starburst amine-terminated polyamidoamine (PAMAM) dendrimers generations 4 and 3.5, respectively. Linear polymer incorporation within the porous CA membrane was performed with mechanical forces, which resulted in modified substrates susceptible to covalent adsorption of the relevant dendritic materials via the formation of amide bonds with a carbodiimide activation agent. The membranes thus prepared were characterized by chemical, physical, and spectroscopic measurements, and the results indicate that the dendrimer peripheral functional groups were the species that participated in the ion-exchange events. The prepared materials were also evaluated for their ion-exchange permeability with sampled current voltammetry experiments involving cationic and anionic species {[Ru(NH3)6]3+ and [Fe(CN6)]3−, respectively} as redox probe molecules under different pH conditions. As expected, although permeability was favored by opposite charges between the dendrimer and the electroactive probe, a clear blocking effect took place when the charge in the dendritic polymer and the electroactive complex was the same. Electrochemical impedance spectroscopy measurements, on the other hand, showed that the PAMAM-modified membranes were characterized by good selectivity and low resistance values for multivalent ions compared to a couple of commercial ion-exchange membranes. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008