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:: Volume 3, Number 1 (6-2014) ::
J Health Dev 2014, 3(1): 14-0 Back to browse issues page
Cr6+Removal by Activated Carbon Magnetized with Nona Zero Valent Iron from Aqueous Solutions: Study Kinetic, Isotherm and Thermodynamic
Abstract:   (706 Views)
v:* {behavior:url(#default#VML);} o:* {behavior:url(#default#VML);} w:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Background: Chromium is one of the most common pollutants that has been noticed in recent years due to its accumulation in human tissues and health risks. The aim of this study is to magnetize powdered activated carbonby Nano zero-valent iron (NZVI) particles and use it as the adsorbent for removal of Cr (VI) from aquatic solutions. Methods: In this study, reduction and co-precipitation methods were used for converting divalent iron into zero-valent iron and depositing zero-valent iron particles on powdered activated carbon in order to induct magnetic effect, respectively. Adsorbent characteristics were analyzed using SEM and XRD techniques. The pH, contact time, stirring rounds, adsorbent dose and the concentration of chromium was determined in optimal condition by Regression coefficient (R 2 ). Then the isotherm, kinetic and thermodynamic equations of adsorption were investigated based on optimum conditions. Statical analysis was done by Design Expert software.   Results: The highest removal efficiency was observed in pH=3, 60 minutes contact time and 0.5 g/L of adsorbent dose in the initial concentration of 4 mg/l chromium. Isotherm and kinetic studies also showed that adsorption process of chromium follows the Freundlich model (R 2 >0.991) and pseudo-second order model kinetics (R 2 >0.982) respectively. In evaluating the reaction thermodynamic, values of ∆H o and ∆S o was equal to 146.99 and -0.452 respectively , which illustrates reactions are endothermic and spontaneous. Conclusion: Powdered activated carbon modified by zero-valent iron has the ability to remove chromium effectively and could be separated from the sample by magnet simply due to its magnetic property.  
Keywords: Chromium(VI), Adsorption, Magnetic activated carbon, Nano zero valent iron Normal 0 false false false EN-US X-NONE AR-SA
Full-Text [PDF 1014 kb]   (369 Downloads)    
Type of Study: Research | Subject: General
Received: 2016/06/13
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Cr6+Removal by Activated Carbon Magnetized with Nona Zero Valent Iron from Aqueous Solutions: Study Kinetic, Isotherm and Thermodynamic. J Health Dev. 2014; 3 (1) :14-0
URL: http://jhad.kmu.ac.ir/article-1-60-en.html
Volume 3, Number 1 (6-2014) Back to browse issues page
مجله بهداشت و توسعه Journal of Health and Development
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