Synthesis And Characterization Of Black, Red And Yellow Nanoparticles Pigments From The Iron Sand

摘要

The aim of this research is to synthesize nanoparticles of black pigment of Magnetite (Fe_3O_4), red pigment of hematite (α-Fe_2O_3), and yellow pigment of ghoetite (α-FeOOH) from the iron sand. The black pigment of Fe_3O_4 and the yellow pigment α-FeOOH nanoparticles were synthesized by coprecipitation method with variation of pH. Whereas, the red pigment Fe_2O_3 was sythesized by sintering Fe_3O_4 nanoparticles at temperature between 400 °C and 700 °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 Fe_3O_4, red pigment Fe_3O_4 and yellow pigment α-FeOOH are around 12, 32, and 30 nm repectively. The particle size of Fe_2O_3 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 aglomarated.