Caracterização de compósitos luminescentes formados por complexos em matriz polimérica com potencial aplicação na detecção de resíduos de explosão

Abstract

The degradation products of nitroaromatic explosives are considered toxic environmental contaminants and are harmful to health. In this context, it is important to detect these substances in soils or in areas close to their processing in order to avoid environmental and health impacts. The aim of this study was to prepare and characterize luminescent composites made up of polyvinyl alcohol (PVA) and lanthanide ion complexes Eu(EDTA)(TTA) and Tb(EDTA(ACAC) for the future detection of explosives residues. The films called Eu-PVA and Tb-PVA were obtained by the casting method, with the PVA dissolved in distilled water, the complex added and the solvent evaporated. The complexes were used in amounts of 1%, 3%, 5%, 10% and 15% in relation to the mass of polymer. The samples were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA) and luminescence analysis. The infrared spectra of the Eu-PVA and Tb-PVA composites showed characteristic peaks at 1562, 1423, 1721 and 1261 cm 1 for the compounds used and gradual increases in the intensity of various bands as the concentration of the complex in the mixture increased. The films showed good thermal stability, where the residual mass was 0, 1.15 and 3.14% and the luminescence analysis showed characteristic lanthanide peaks which increased in intensity as their concentration increased in the film. The studies carried out suggest that these films have potential for application in the detection of explosive residues.