Abstract
In this study, Extran (biodegradable surfactant) was used for the preparation of Fe3O4 nanoparticles by microemulsion process to improve removal efficiency of As(III) from aqueous solution. Fe3O4 nanoparticles were characterized by XRD, FTIR, FESEM, TEM, HRTEM, and VSM instrumental techniques. The effect of different parameters such as adsorbent dose, initial As(III) concentration, and solution pH were studied by response surface methodology (RSM) based on Box-Behnken design (BBD). The optimized condition for adsorption of As(III) from aqueous solution was obtained as adsorbent dose of 0.70 mg/g, solution pH of 7.7, and initial As(III) concentration of 33.32 mg/L. In this optimum condition, about 90.5% of As(III) was removed from the aqueous solution. Isotherm studies have been done at optimal condition, and it was observed that the Langmuir isotherm models were fitted well with experimental data having a high correlation coefficient of 0.993. From the Langmuir isotherm data, the maximum adsorption capacity of Fe3O4 nanoparticles was found to be 7.18 mg/g at pH 7.7 in room temperature. This study revealed that Fe3O4 nanoparticles can be used as an efficient, eco-friendly, and effective material for the adsorptive removal of As(III) from aqueous system.
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Acknowledgements
The authors thank the Board of Research in Nuclear Sciences, DAE, India for funding the research project (2013/34/20/BRNS/2708). The authors are also thankful to the National Institute of Technology, Rourkela for providing the research facilities.
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Sahu, U.K., Sahu, M.K., Mahapatra, S.S. et al. Removal of As(III) from Aqueous Solution Using Fe3O4 Nanoparticles: Process Modeling and Optimization Using Statistical Design. Water Air Soil Pollut 228, 45 (2017). https://doi.org/10.1007/s11270-016-3224-1
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DOI: https://doi.org/10.1007/s11270-016-3224-1