سنتز و مشخصه يابي نانو ذرات مغناطيسي اصلاح شده توسط 4-فنيل-3- تيو سمي كاربازيد و استفاده از آن ها در حذف يون هاي فلزي سنگين

چكيده انگليسي :

4 Phenyl 3 Thiosemicarbazide Modified Magnetic Nanoparticles Synthesis Characterization and their Application in the Removal of Heavy Metal Ions Mohammad Reza Mohammadi o mohamadi@yahoo com Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Hamid Zilouei hzilouei@cc iut ac ir Supervisor Kiomars Zargoosh kiomarszargoosh@cc iut ac ir Abstract Heavy metals are major pollutants in the environmen due to their bioaccumulation in living cells and their non biodegradable nature The objectives of this research were synthesing the magnetite nanoparticles Fe3O4 and determining their efficiency in the removal of heavy metal ions from aqueous solutions In this study magnetic nano adsorbent has been synthesized by the covalent immobilization of poly acrylic acid PAA and 4 phenyl 3 thiosemicarbazide TSC as a complexing agent on the surface of Fe 3O4 nanoparticles Scanning electron microscopy SEM atomic force microscopy AFM FT IR spectroscopy X ray diffraction and vibration sample magnetometer VSM were used for characterization of the synthesized magnetite nanoparticles Atomic absorption spectroscopy AAS was used for determination of heavy metal ions in the solution befor and after treatment with adsorbent The ability of the Fe3O4@PAA@TSC MNPs for removing heavy metal ions Pb2 Cd2 Co2 Cu2 and Zn2 from aqueous solution was studied and the effects of pH contact time metal ion concentration and background electrolytes on heavy metal ions removal efficiency were investigated in batch system SEM results showed that the diameter of the particles is in the rang of 40 60 nm Results also showed that the optimum pH value for adsorption is 5 The kinetic data were properly fitted by the pseudo second order model The assumption that the metal ions adsorption is due to complex formation between active sites of the adsorbent and the heavy metal ions was further confirmed by investigating the adsorption isotherms and kinetics The equilibrium time of 45 min and 0 050 g used of adsorbent for the volume 50 0 mL of wastewater solution Finally adsorption process was investigated with Langmuir and Freundlich isotherms The experimental adsorption equilibrium data were fitted to Langmuir adsorption and the maximum adsorption capacities of Pb 2 Cd2 Co2 Cu2 and Zn2 were found to be 181 1 125 0 86 2 67 1 and 57 8 mg g 1 respectively The adsorption capacity increased and the adsorption efficiency decreased with increasing the concentration of heavy metal ions and reducing the amount of adsorbent The desorption experiments under batch conditions revealed that the Fe 3O4@PAA@TSC MNPs are reusable adsorbent for practical removal of the heavy metal ions The ability of the prepared nanoparticles for removal of heavy metal ions from industrial samples was evaluated by using different industrial wastewaters from Moham industrial complex Raad plating company and Iran Aircraft Manufacturing Industrial Company HESA and obtained optimum conditions is adsorbent concentration 1 0 g L 1 contact time 45 minutes solution pH 5 0 solution valume 50 0 mL and stirrer speed 300 round per minutes that is applied to real samples Excellent adsorption capacity of the modified nano adsorbent together with other advantages such as reusability easy synthesis easy separation and more specially freedom of interferences of alkaline earth metal ions make them suitable alternatives to the well known adsorbents for removal of heavy metal ions from industrial wastewaters Key Words Heavy Metal Magnetic Nanoparticle Poly Acrylic Acid 4 Phenyl 3 Thiosemicarbazide Magnetite Fe3O4 PDF created with pdfFactory trial version www pdffactory com

محمدي، محمدرضا

سنتز و مشخصه يابي نانو ذرات مغناطيسي اصلاح شده توسط 4-فنيل-3- تيو سمي كاربازيد و استفاده از آن ها در حذف يون هاي فلزي سنگين

پلي اكريليك اسيد , مگنتيت , Fe3O4