Síntese e Caracterização de um material solúvel à base de nióbio

Abstract

With the increasing evolution of technology to meet human needs, an increase in the demand for new materials is a fact. In this scenario the chemical element niobium has been gaining prominence. By forming various compounds that have refractory, mechanical and catalytic properties, the element has attracted attention from the most varied areas such as steel, electronics, battery and petrochemical sectors. However, materials that contain niobium and are soluble in water, some of which have low stability or are toxic, are not common. This study presents the process of synthesis, optimization, characterization and economic viability of a niobium-containing material that is soluble in water from a reaction of Nb2O5 and H3PO3, having in its composition niobium as the only metallic element. In this work was used several tools and techniques in each step: in optimizations were used Taguchi experimental designs, in characterizations were used x-ray fluorescence (ED-XRF), infrared spectrometry (IR), atomic emission spectrometry with microwave induced plasma coupled (MIP-AES), spectrometry in visible region of a phosphorusvanadomolibdic complex, and thermodynamic calculations. The results showed the material has presented good pH stability in a wide range (from 1,2 to 8,9), having a competitive relatively cost, with small residue and presenting NbPO4 as the calculated chemical formula called niobium phosphate III. Owing this features, it is concluded that the material shows good potential for high technological applications as catalysts and precursor for functionalized materials.