Synthesis and characterization of black, red and yellow nanoparticles pigments from the iron sand

Abstract

The aim of this research is to synthesize nanoparticles of black pigment of Magnetite (Fe3O4), red pigment of hematite (α-Fe2O3), and yellow pigment of ghoetite (α-FeOOH) from the iron sand. The black pigment of Fe3O4 and the yellow pigment α-FeOOH nanoparticles were synthesized by coprecipitation method with variation of pH. Whereas, the red pigment Fe2O3 was sythesized by sintering Fe3O4 nanoparticles at temperature between 400 °C and 700 7°C for 1 hour. All the pigments has been characterized using X-ray diffraction and SEM. The XRD results shown that the particle size of the black pigmen Fe3O4, red pigment Fe3O4 and yellow pigment α-FeOOH are around 12, 32, and 30 nm repectively. The particle size of Fe2O3 nanoparticles increase by increasing sintering temperature from 32 nm at 400 °C to 39 nm at 700 °C. For yellow pigment of α-FeOOH, the particle size increase by increasing pH from 30,54 nm at pH 4 to 48,60 nm at pH 7. The SEM results shown that the morphologies of black, yellow and red pigments are ...