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Fabrication of perovskite-type oxide nanopowders as a novel adsorbent in removal of Bromo Thymol Blue dye from aqueous solutions

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.


hqdefaultNanoparticles 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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