Abstract
In the present study, response surface methodology (RSM) was applied to maximize As(V) removal from aqueous solutions by using modified magnetic nanoparticles with ascorbic acid (AA-MNPs). The structural features of the produced material were characterized by means of X-ray diffraction (XRD), N2 adsorption–desorption, Fourier transform infrared (FT-IR), vibrating sample magnetometer (VSM), thermogravimetric analyses (TGA), and scanning electron microscopy (SEM). More specifically, the effects of pH, temperature, arsenic ion concentration, and sorbent dosage were investigated on the arsenic adsorption. A total of 20 sets of experiments were designed by the software to achieve maximum adsorption capacity (q e ) and removal efficiency (R). Analysis of variance (ANOVA) of the two-factor interaction (2FI) model suggested that the predicted values were in good agreement with experimental data. The best local maximum values for pH, arsenic concentration, and sorbent dosage were found to be 2, 5 mg L−1, and 0.1 g L−1, respectively, that yielding maximum q e of 44.99 mg g−1 and a maximum R of 42.69 %. Additionally, the obtained value for desirability was equal to 0.862. The results indicated that the Langmuir model provided the best correlation of the equilibrium data. Moreover, the obtained results revealed that the pseudo-second-order kinetic model could best describe the adsorption kinetics.
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Acknowledgments
The present research was made possible through a university grant, sponsored by University of Kurdistan (UOK), Ministry of Science, Iran. The authors wish to thank Mr. Hoshyar Gavilian, the technician of environment laboratory at environmental science departments, for his assistance.
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Nikraftar, N., Ghorbani, F. Adsorption of As(V) Using Modified Magnetic Nanoparticles with Ascorbic Acid: Optimization by Response Surface Methodology. Water Air Soil Pollut 227, 178 (2016). https://doi.org/10.1007/s11270-016-2876-1
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DOI: https://doi.org/10.1007/s11270-016-2876-1