Structural and electrochemical characterization of sulfonated styrene-divinyl benzene/Bismuth-Tin electrodes
Por:
Suarez, Oscar, Olaya, Jhon Jairo, Rodil, Sandra E.
Publicada:
1 ene 2021
Resumen:
Sulfonated styrene divinylbenzene/Bismuth-Tin composites were produced and stabilized with polyoxyethylene 23 lauryl ether (Brij®) as an alternative to Nafion®-metal nanocomposites. The terpolymers were synthesized by emulsion polymerization, and the metal particles were produced by reduction with sodium borohydride in a mixture of sulfonated terpolymer and Brij® assisted by ultrasound. Dynamic light scattering was used for measuring the average hydrodynamic diameter. Time stable nano emulsions of polymer-metal particles between 200 and 500 nm with no appreciable changes in size were observed. Through statistical analysis, the composition of the reactive mixture (Bi, total metal, and % Brij®) was related to the metal particle size. Selected terpolymers and composites with a total metal concentration of 13% w/w were casted and structurally characterized by means of infrared spectroscopy and X-ray photoelectron spectroscopy. The morphology and polymer-metal distribution were studied via field emission electron microscopy. For high bismuth content, clusters greater than 100 nm in diameter were observed and the increase in tin content produce discrete particles of 20–40 nm. The electrochemical behavior of the composites was studied for the detection of Cd, Cu, Zn and Pb via square-wave anodic stripping voltammetry, the electrodes had a good performance to measure only cadmium with a detection limit and sensitivity like those of Nafion-bismuth composites obtained previously. This material also presented less degradation but showed interference in the presence of the other metals. © 2021
Filiaciones:
Suarez, Oscar:
Universidad Nacional de Colombia, Dpto Ingeniería de sistemas e Industrial, Cra 30 # 45, Bogotá, Colombia
Olaya, Jhon Jairo:
Universidad Nacional de Colombia, Dpto Ingeniería Mecánica y Mecatrónica, Cra 30 # 45, Edificio 407, Bogotá, Colombia
Rodil, Sandra E.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad de México, 04510, Mexico
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