Maryam Maskanati, Haman Tavakkoli
Department of Chemistry, College of Science, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Key words: Nanopowder, Perovskite-type oxide, Hydrothermal method, Dye removal, Kinetic studies.
In The present study, nanoparticles of perovskite-type La1-X Sr XCrO3 (LSCO) were prepared by Hydrothermal method in the presence of NaOH as a chelating agent. A series of common analytical techniques were used to characterize of the nanopowders. Thermal decomposition process of the complex precursor was examined by means of thermal gravimetric analysis (TGA). The surface morphology and composition of these nanopowders were also investigated using scanning electron microscopy (SEM). X-ray diffraction (XRD) patterns showed that single perovskite phase has been completely formed after calcinations treatment and transmission electron microscopy (TEM). The average particle size of LSCO is about 30 nm. The Fourier transform infrared (FT-IR) spectra were also measured for studying of structure of prepared nanopowders. The nanoparticles showed the excellent adsorption properties towards Bromo thymol blue (C27H28Br2O5S).The adsorption studies have been carried out at different pH values, initial dye concentration and adsorbent doses to the optimum conditions. the removal of BTB above 88% was achieved. The Kinetic studies indicate that the removal process obeys the second-order kinetic equation. Also, The experimental isotherms were analyzed with four parameters equations (Freundlich, Langmuir, Temkin, and Redlich–Peterson) using linear regression.
Get the original articles in English: http://www.innspub.net/volume-6-number-4-april-2015-jbes/