Zohreh Zaman, Haman Tavakkoli
Department of Chemistry, College of Science, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Key words: Nanopowder, Perovskite-type oxide, Bromo thymol blue, Isotherm.
Nanoparticles of perovskite-type Gd0.5Ca0.5CrO3 was investigated for its ability to perform as a suitable sorbent for anionic dye from aqueous solution. The nanoperovskite were characterized using X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The effects of various experimental factors; adsorbent dose, contact time, pH and dye concentration were studied by using the batch technique. Experimental results indicate that the prepared Gd0.5Ca0.5CrO3 nanopowder can remove 91.38% of BTB dye under optimum operational conditions of a dosage of 0.02 g, pH 2, contact time of 25 min and initial dye concentration of 50mg/L. Adsorption isotherms have been modeled by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R). The Langmuir model displayed the best fit for the isothermal data. The maximum predicted adsorption capacities were 300 mg/g for Bromo Thymol Blue (BTB) dye. The results showed that the sorption kinetics of BTB removal from aqueous solutions onto nanopowder fitted well with the pseudo-second-order model.
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