Adsorption of hazardous cationic dye onto the combustion derived SrTiO3 nanoparticles: Kinetic and isotherm studies

In this article we report on solution combustion method to synthesize SrTiO3 nanoparticles (ST -NPs) and the removal of malachite green (MG) azo dye from the aqueous solution. The synthesized ST -NPs were calcined at 600 degrees C for 2 h. Powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) were used to characterize the product. Adsorption experiments were performed with cationic malachite green (MG) dye. 98% dye was adsorbed onto the ST -NPs at pH 10 for 30 min of the contact time. The optimum adsorbent dose was found to be 0.015 g/L of the dye. To study the adsorption kinetics Langmuir Hinshelwood model was used and the first order kinetic best describes the MG adsorption onto the ST -NPs. The adsorption isotherms data of MG onto ST -NPs obtained were analyzed by Langmuir and Freundlich isotherm models and the results describe the best representation of the Langmuir isotherm model. (C) 2015 The Ceramic Society of Japan and the Korean Ceramic Society. Production and hosting by Elsevier B.V. All rights reserved.