Fabrication of perovskite-type oxide La 0.5Pb 0.5MnO 3 nanoparticles and its dye removal performance

摘要

La~(0.5)Pb~(0.5)MnO~(3)perovskite-type oxide is prepared by sol–gel method. The physical and chemical properties of a nanoparticle were characterized by differential thermal analysis (DTA), thermogravimetric analysis, XRD, and scanning electron microscopy (SEM) techniques. The adsorption effect of the sample is evaluated by removal of Eosin dye from aqueous solution. The results of XRD indicate that the perovskite-type oxide has a good crystal phase at 650?°C. The DTA, XRD, and SEM data revealed that La~(0.5)Pb~(0.5)MnO~(3)nano particles are prepared successfully via sol–gel modified pechini method. These nanoparticles showed the excellent adsorption efficiency towards Eosin 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 experiment. The dye removal efficiency was found to be decreased with increasing in initial pH of the dye solution, and nanoadsorbent exhibited good dye removal efficiency at acidic pH specially pH 1. Experimental results indicated that the adsorption kinetic data follow a pseudo-first-order rate for tested dye. The isotherm evaluations revealed that the Freundlich model attained better fits to the experimental equilibrium data than the Langmuir and Temkin models.