In this study, removal of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was investigated with variation of pH, adsorbent dosage, initial Cr(VI) concentration, ionic strength and temperature. Coating of Fe3O4 nanoparticles onto Scallop shell was identified by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The maximum adsorption was observed at pH 3. Removal efficiency of Cr(VI) was increased with increasing adsorbent dosage, but was decreased with increasing initial Cr(VI) concentration and temperature. Removal efficiency of Cr(VI) was decreased in the presence of sulfate and carbonate ions. Adsorption kinetic study revealed that a pseudo-second order model better described the removal data than a pseudo-first order model and an intra-particle diffusion model. Maximum adsorption capacity was estimated to be 34.48 mg/g. Thermodynamic studies indicated that adsorption of Cr(VI) onto Scallop shell-Fe3O4 nanoparticles occurred via an exothermic (ΔH = −320.88 KJ mol−1) process. Adsorption efficiency of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was maintained even after eight successive cycles.
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Research Article|
February 27 2017
Application of Scallop shell-Fe3O4 nanoparticles for the removal of Cr(VI) from aqueous solutions Available to Purchase
Azita Mohagheghian;
Azita Mohagheghian
1Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran
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Robabeh Vahidi-Kolur;
Robabeh Vahidi-Kolur
1Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran
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Melina Pourmohseni;
Melina Pourmohseni
1Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran
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Jae-Kyu Yang;
Jae-Kyu Yang
2Ingenium College, Kwangwoon University 20 Kwangun-ro, Nowon-Gu, Seoul, Korea 01897
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Mehdi Shirzad-Siboni
1Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran
3Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran and Research Center of Health and Environment, Guilan University of Medical Sciences, Rasht, Iran
E-mail: [email protected]
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Water Sci Technol (2017) 75 (10): 2369–2380.
Article history
Received:
June 13 2016
Accepted:
February 09 2017
Citation
Azita Mohagheghian, Robabeh Vahidi-Kolur, Melina Pourmohseni, Jae-Kyu Yang, Mehdi Shirzad-Siboni; Application of Scallop shell-Fe3O4 nanoparticles for the removal of Cr(VI) from aqueous solutions. Water Sci Technol 25 May 2017; 75 (10): 2369–2380. doi: https://doi.org/10.2166/wst.2017.120
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