Document Type: Research Paper
Department of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
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.