Simple Chemical Route Synthesis of Fe₂O₃Nanoparticles and its Application for Adsorptive Removal of Congo Red from Aqueous Media: Artificial Neural Network Modeling

Abstract

Nanocrystalline Fe 2 O 3 powder was synthesized by a simple chemical route involving FeCl 3 and NaOH. The Fe 2 O 3 powder thus prepared was characterized using X-ray diffraction study; scanning electron microscopy and Fourier transform infrared spectroscopy. The adsorption properties of crystalline Fe 2 O 3 powder have been investigated with an aim to explore a possible low cost and efficient way to remove Congo red (CR) from waste water. Fe 2 O 3 powder was found as an excellent adsorbent for CR from aqueous medium. Adsorption capacity as much as 203.66 mg g -1 is reported at room temperature. Effect of different experimental parameters such as reaction pH, initial CR dye concentration, adsorbent dose and reaction temperature were studied on adsorption capacity of Fe 2 O 3 powder and modeled by artificial neural network (ANN).Optimal ANN structure (4-5-1) shows minimum mean squared error (MSE) of 0.00235 and determination coefficient (R 2 ) of 0.991 with Levenberg-Marquardt algorithm.Isotherm analysis of experimental data exhibited better fit to the Langmuir isotherm. The adsorption process was found to follow second order kinetics as depicted by the analysis of experimental results. Thermodynamic study shows that the adsorption process is Downloaded by [University of Otago] at 06:21 27 July 2015 2 endothermic, spontaneous and thermodynamically favorable in the temperature range of 27ºC to 60 ºC.

Adsorption characteristics of methyl blue onto magnetic Ni0.5Zn0.5Fe2O4 nanoparticles prepared by the rapid combustion process

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“…Activated carbons, having powder or granular forms, are mostly used for heavy metal ions removal from wastewater. However, this adsorbent is expensive for a developing country and its selectivity is limited . The adsorption capacity of Cr (VI) from aqueous solutions using biomass was evaluated by investigating various parameters.…”

Study on the Antagonistic Potential of Biosynthesized Hematite Nanoparticles During Water and Wastewater Treatment

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