Optimization of FeSO4 Molarity for Synthesis of Prussian Blue Pigment from Iron Sand from Sunur Beach Estuary, Pariaman

Abstract

The objective of this research was to see how the molarity of Iron(II) sulfate (FeSO₄) solution affected the coloring of the Prussian blue pigment produced, to find the best synthesis conditions. The coprecipitation methods were used to synthesize Prussian blue from FeSO₄ and K₃[Fe(CN)₆] solutions. The molarity of iron(II) sulfate (FeSO₄) was varied to 0.005 M, 0.0025 M, and 0.00125 M in this research, with the resulting products referred to as K1, K2, and K3. The UV-Visible spectrophotometer was used to analyze the produced pigment. The molarity of Iron(II) sulfate (FeSO₄) impacts the final Prussian blue pigment, as observed in the experiment with variations in the molarity of FeSO₄. The optimum color of Prussian blue, with a peak near-standard UV-Visible spectra at 686 nm, was produced at 11.85 mM FeSO₄ molarity, which was very much by the standard absorbance wavelength Prussian blue pigment.