Nanoparticles of FeNbO4 Produced by Microwave Assisted Combustion Reaction: A Potential Technology for the Treatment of Wastewater

F. V. de Andrade, C. F. Costa, M. R. de Freitas, A. C. T. Cabral, N. M. Barros, G. M. de Lima
2020 Materials Research  
Iron(III) niobate, FeNbO 4 , was synthesized for the first time by microwave-assisted combustion reaction between Fe(NO 3 ) 3 .9H 2 O and NH 4 [NbO(C 2 O 4 ) 2 (H 2 O) 2 ](H 2 O) in the presence of NH 4 NO 3 and Urea {O=C(NH 2 ) 2 }. Experiments of X-ray powder diffraction revealed a small crystallite size for this material, 16 nm, and the results of MEV showed that it forms agglomerates with diameters between 80 and 180 nm with spherical shapes. HRTEM images revealed that the material is
more » ... e material is formed by clusters of particles with a diameter near 20 nm. A surface area of 40 m 2 g -1 was determined by experiments of specific surface area (SSA). The FeNbO 4 induced the decomposition of H 2 O 2 , forming radicals that, in turn, discoloured Indigo dye Carmine (IC) a solution. The results showed that this niobate was able to degrade 55% of the initial solution in the presence of H 2 O 2 after 360 minutes of reaction time.
doi:10.1590/1980-5373-mr-2020-0166 fatcat:24wu35stcjervla7g55mpo22by