Synthesis of the LaCoO3, SrCoO3 and La0.7Sr0.3CoO3 materials by the modified proteic method and tests for use as adsorbent

Abstract LaCoO 3 , SrCoO 3 and La 0.7 Sr 0.3 CoO 3 materials were synthesized using the modified proteic method using gelatin as a chelating agent, to study the effect of metal type in the formation of the perovskite structure, as well as to test its adsorptive capacity when removing a dye from aqueous medium. The formation of the perovskite phase was predominant, and the modified proteic method was efficient in producing materials with relatively high surface areas, in comparison to other methods of synthesis. The materials showed removal efficiency of Bezaktiv red dye until 95 %. The experimental data were applied to kinetic models pseudo-first order, pseudo-second-order and variable constants. In studies for the reuse of adsorbents, it was proven that the adsorbents maintained their efficiency and the perovskite structure was maintained, signaling its stability after adsorption and recovery conditions.