en تخصصي Special مقاله اصیل Original Article <p dir="ltr">Background: The rapid increase in agricultural and industrial development has made heavy metal pollution a serious environmental problem and public health threat; therefore, removal of heavy metals from water is important. The current study prepared DNPH@SDS@Fe3O4 nanoparticles as a novel and effective adsorbent for removal of Hg(II) ions from an aqueous solution.<br> Methods: A selective adsorbent for Hg(II) was synthesized by coating Fe3O4 nanoparticles with sodium dodecyl sulfate which was further functionalized with 2,4-dinitrophenylhydrazine (2,4-DNPH). The synthesized nanoparticles were characterized by Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), scanning electron microscopy (SEM) and SEM&ndash;EDXSt. The effects of pH, dose of adsorbent and shaking time on adsorption capacity were investigated. The kinetics and equilibrium of adsorption of the metal ions were thoroughly studied.<br> Results: SEM showed that the size of the nanoparticles was 20 to 35 nm. The maximum adsorption capacity for Hg(II) was 164.0 mg g-1 for an adsorbent dose of 0.04 g at pH 7.0, 25&deg;C and the initial metal concentration was 25 mg L-1,which was greater than for most adsorbents previously examined for Hg(II) adsorption. Adsorption experimental data showed good correlation with the pseudo-second-order model and Langmuir isotherm model.<br> Conclusion: The results indicated that the DNPH@SDS@Fe3O4 nanoparticles are an efficient adsorbent for removal of heavy metal from wastewater.<br> &nbsp;</p> Adsorption, Mercury, Magnetite nanoparticles, Wastewater, Kinetics 183 189 http://ehemj.com/browse.php?a_code=A-10-1-66&slc_lang=en&sid=1 Soheil Sobhanardakani* s_sobhan@iauh.ac.ir 10031947532846002682 10031947532846002682 Yes Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran Raziyeh Zandipak 10031947532846002683 10031947532846002683 No Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran Lobat Taghavi 10031947532846002684 10031947532846002684 No Department of the Environmental Pollution, College of Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran