LaCo0.5Fe0.5O3 Nanoparticles as a Highly Efficient Adsorbent for Rapid Removal of Trypan Blue Dye From Aqueous Media

Nanoparticles of perovskite-type LaCo0.5Fe0.5O3 (LCFO) were fabricated by sol–gel method. Thermal decomposition process of the complex precursor was examined by means of differential thermal analysis–thermal gravimetric analysis (DTA/TGA). X-ray diffraction (XRD) results showed that single perovskite phase has been completely formed after calcination at 750 °C. In addition, the surface morphology and composition of these nanopowders were also investigated using SEM and EDX. These nanoparticles showed the excellent adsorption efficiency towards Trypan Blue (TB) as a reactive dye in aqueous solution. The adsorption studies were carried out at different pH values, dye concentrations, various adsorbent dosages and contact time in a batch experiments. LCFO exhibited good dye removal efficiency at acidic pH specially pH 2. Experimental results indicated that the adsorption kinetic data follow a pseudo-second order rate for tested dye. The isotherm evaluations revealed that the Freundlich model better fits to the experimental equilibrium data than Langmuir the model.