Author/Authors :
Kakavandi، Babak نويسنده Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Rezaei Kalantary، Roshanak نويسنده Department of Environmental Health, School of Health, Tehran University of Medical Sciences, Tehran, Iran. Rezaei Kalantary, Roshanak , Farzadkia، Mahdi نويسنده Associate Professor, Department of Environmental Health Engineering , , Mahvi، Amir Hossein نويسنده Department of Environmental Health Engineering, School of Health; National Institute of Health Research; Center for Solid Waste Research, Institute fo , , Esrafili، Ali نويسنده Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Delfan Azari، Qanbar Ali نويسنده دانش آموخته كارشناسي ارشد مديريت آموزشي دانشگاه آزاد اسلامي واحد رودهن دلفان آذري, قنبرعلي , Yari، Ahmad Reza نويسنده Department of Environmental Health Engineering, School of Public Health, Qom University of Medical Sciences, Qom, Iran , , Javid، Allah Bakhsh نويسنده Department of Environmental Health Engineering, School of Public Health, Shahrood University of Medical Sciences, Semnan, Iran ,
Abstract :
Recently, adsorption process has been introduced as a favorable and effective technique for the removal of metal
ions from aqueous solutions. In the present study, bimetallic nanoparticles consisting of zero valent iron and silver
were loaded on the activated carbon powder for the preparation of a new adsorbent (PAC-Feo/Ag). The above
adsorbent was characterized by using XRD, SEM and TEM techniqes. Experimental data were exploited for kinetic,
equilibrium and thermodynamic evaluations related to the adsorption processes. The Cr(VI) adsorption process was
found to be favorable at pH 3 and it reached equilibrium state within 60 min. The stirring rate did not have a
significant effect on the adsorption efficiency. Furthermore, the monolayer adsorption capacity of Cr(VI) based on
the Langmuir model was measured to be 100 mg/g. The experimental equilibrium data were fitted to the
Freundlich adsorption and pseudo second-order models. According to the thermodynamic study, the adsorption
process was spontaneous and endothermic in nature, indicating the adsorption capacity increases with increasing
the temperature. The results also revealed that the synthesized composite can be potentially applied as a magnetic
adsorbent to remove Cr(VI) contaminants from aqueous solutions.
