Soheil Sobhanardakani
1*, Raziyeh Zandipak
2, Mehrdad Cheragh
11 Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
2 Young Researchers and Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran
*Corresponding Author: * Corresponding author: Soheil Sobhanardakani, Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran. Tel: +98-8134494170, Fax: +98-8134494170,, Email:
s_sobhan@iauh.ac.ir
Abstract
In this study, sodium dodecyl sulfate (SDS) coated magnetite modified with 2, 4-Dinitrophenylhydrazine was used to remove Cr
(VI) ions from aqueous solution. The modified magnetite nanoparticles were characterized by X-ray diffraction (XRD) analysis,
Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and SEM–EDXS measurement. The synthesized
nanoparticles exhibited a high surface area of 75.5 m2
g
-1 and were of 20 - 35 nm in particle size. The effects of parameters,
including pH, dose of adsorbent, temperature and contact time were investigated to find the optimum adsorption conditions. Adsorption
data fits well with the Langmuir isotherm model with a maximum adsorption capacity (qm) and a Langmuir adsorption
equilibrium constant (b) of 169.5 mg g-1 and 0.168 L mg-1, respectively. The adsorption kinetic agrees well with pseudo-second-order
model.