A. Yulianto, M. Fitriawan, Sulhadi, Khumaedi, I. Sumpono
The organic pigment was synthesized from iron sand, and alum used sol-gel method. Iron sand was soluted on chloride acid to made FeClx. The chelating agent was used oxalic acid to form metal organic as iron oxalic (FeC2O4). Adjustment of pH about 2 has done by NH4OH titration with precursor volume ratio variation. The gel was formed with PEG addition on 150°C heating temperature for 8 hours. The gel was washed with distilled water to eliminate salts residue. The gel was heated on temperature 200°C for 5 hours then yellow pigment is formed. XRD characterization showed that the yellow pigment has a structure of Jarosite. The color of pigment was analyzed using CIE Lab and identified that the yellow color composition is dominant on 1:1 volume ratio of precursor NH4OH. The color and magnetic properties of the pigment were changed by heating treatment. © 2019 Published under licence by IOP Publishing Ltd.
Physics Department, Faculty of Mathematics and Natural Sciences Universitas Negeri Semarang, Indonesia
