حذف يون هاي فلزي سنگين از پساب هاي صنعتي با استفاده از نانو ذرات مغناطيسي اصلاح شده توسط تيوساليسيل هيدرازيد

چكيده انگليسي :

68 Removal of heavy metal ions from industrial wastewaters using thiosalicylhydrazide modified magnetic nanoparticles Hamed Abedini abedini hamed68@yahoo com Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Kiomars Zargoosh Dr kiomarszargoosh@cc iut ac irAbstract A novel magnetic nano adsorbent has been synthesized by the covalent immobilization of poly acrylic acid PAA and a thiosalicylhydrazide TSH agent on the surface of Fe3O4 nanoparticles Theprepared magnetic nanoparticles MNPs were characterized by Scanning electron microscopy SEM Atomic force microscopy AFM FT IR spectroscopy X ray diffraction and Vibration samplemagnetometer VSM The SEM images showed that the diameters of the Fe3O4@PAA@TSH MNPsare about 10 35 nm The ability of the Fe3O4@PAA@TSH MNPs for removing heavy metal ions Pb2 Cd2 Cu2 Zn2 and Co2 from aqueous solution was studied and the effects of the solution pH contacttime metal ions concentration and background electrolytes on the adsorption characteristics of themodified MNPs were investigated The results showed the conditions of solution pH 5 2 100 mg L 1initial concentration of heavy metal ion 1 g L 1 adsorbent and time of 40 minutes dose the optimumconditions for this application Finally adsorption process was investigated with Langmuir andFreundlich isotherms The experimental adsorption equilibrium data were fitted to Langmuir adsorptionand the maximum adsorption capacities of Pb2 Cd2 Cu2 Zn2 and Co2 were found to be 188 7 107 5 76 9 51 3 and 27 7mg g 1 adsorbent respectively The adsorption was fairly rapid because itdoesn t take more 40 minutes to reach the equilibrium state and kinetic data were precisely fitted by thepseudo second order model The assumption that the metal ions adsorption is due to complex formationbetween active sites of the adsorbent and the heavy metal ions was further confirmed by investigatingthe adsorption isotherms and kinetics The desorption experiments under batch conditions revealed thatthe Fe3O4@PAA@TSH MNPs are reusable adsorbent for practical removal of the heavy metal ions Inaddition it was found that presence of amine and sulfur binding sites on the surface of the preparedMNPs not only can significantly improve the adsorption capacity of the adsorbent but also can notablyreduce the interferences of the alkaline earth metal ions These improvements are most probably due tohigher affinity of the sulfur and amine sites of the modified MNPs for complex formation with theheavy metal ions via soft soft interactions For testing the ability of the prepared nanoparticles forremoval of heavy metal ions from industrial samples was evaluted using different industrial wastewatersfrom Moham industrial complex Raad plating company and Iran Aircraft Manufacturing IndustrialCompany HESA and obtained optimum conditions is adsorbent concentration 1 g L 1 contact time 40minutes solution pH 5 2 solution valume 50 mL and stirrer speed 300 round per minutes that isapplied to real samples The obtained resuls showed that Fe3O4@PAA@TSH MNPs can be used forremoval of heavy metal ions from industrial wastes Key Words Magnetic nanoparticle Poly acrylic acid Thiosalicylhydrazide Heavy metals Fe3O4

عابديني، حامد

حذف يون هاي فلزي سنگين از پساب هاي صنعتي با استفاده از نانو ذرات مغناطيسي اصلاح شده توسط تيوساليسيل هيدرازيد

پلي آكريليلك اسيد , Fe3O4