II Simposio Internacional de Ciencia de los Materiales

Chemical characterization of 1-acylthioureas-based sensing membranes for Pb(II)-ion selective electrodes by X-ray photoelectron spectroscopy

No programado

20m

Centro Demostrativo de Energía Renovables (Quinta de los Molinos)

Poster Caracterización y Procesamiento de Materiales Materiales para la sostenibilidad y aplicaciones medioambientales

Ponente

Dr. Osvaldo L. Estévez Hernández (IMRE, Universidad de La Habana)

Descripción

1-Acylthioureas are molecules known for their versatility towards the coordination of transition metal ions. That is why they have found application as receptors for the development of heavy metals-ion selective electrodes. The characterization of the electrode’s sensing membranes using X-ray photoelectron spectroscopy (XPS) can greatly enrich a study based on their analytical response. However, the use of this macroscopic characterization technique for understanding the processes occurring at the membrane-solution interface is rather unusual. In this work, solid-state Pb(II)-ion selective electrodes based on 1-benzoyl-3,3-diethylthiourea (BDE), 1-benzoyl-3,3-diphenylthiourea (BDF), 1-(2-furoyl)-3,3-diethylthiourea (FDE) and 1-(2-furoyl)-3,3-diphenylthiourea (FDF) were constructed.We have explored the chemical composition of the PVC sensing membranes after the activation process by using XPS profiles S2p and Pb4f. The results supported chemically theanalytical response displayed for the studied electrodes shedding light on their working mechanism.