5075

4772

كارشناسي ارشد

مهندسي شيمي

اصفهان: دانشگاه صنعتي اصفهان،دانشكده مهندسي شيمي

1388

سيزده،92ص.: مصور،جدول،نمودار

ص.ع.به: فارسي و انگليسي

غلامرضا اعتماد

88/12/12

شمس، قريشي

1396/09/28

كتابنامه

مهندسي شيمي

ID4772

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

ABSTRACTBased on nanotechnology the proposed process is used to eliminate heavy metal cationsfrom the aqueous media and provides a better solution for the existing problems of theseparation systems like low efficiency and high costs The heavy metal cations selectedfor this purpose are cadmium lead and copper whereas the nanoparticles aresuperparamagnetic iron oxide Fe3O4 The separation system consists of a two stage process In the first stage the iron oxidenanoparticles are suspended in an aqueous medium contaminated with the heavy metalcations and adsorb these cations In the second stage the solution which contains thenanoparticles impregnated with the heavy metal cations is brought into contact with aferromagnetic matrix or a paramagnetic matrix magnetized by the application of anoutside magnetic field The heavy metal cations are deposited on the matrix under theimposed magnetic field This two stage process makes it possible to separate the heavymetal cations from the aqueous medium The wire matrices are upon the completion ofseparation washed away by water or air current Within the framework of the present process the effects of the various parameters liketemperature pH contact time initial concentration of heavy metals weight percentage ofnanoparticles and magnetic field intensity are studied in both stages The test results showthat these parameters have significant effects on the adsorption process output but haveno noticeable effect on the magnetic capturing yield For adsorption process it is observed that with any increase in the weight percentage ofnanoparticles the initial concentration of heavy metal cations and contact time theadsorption of the cations is increased whereas with the increase in pH and temperature the adsorption is decreased Based on the results any change in weight percentage ofnanoparticles initial concentration of heavy metal cations and pH brings about asignificant change in the adsorption process output whereas the change in time andtemperature has not a considerable effect on the adsorption process output Measurements of the heavy metal cations concentration before and following theseparation process indicate high separation and show the very high potential of thenanotechnology in eliminating the heavy metal cations as one of the most dangerouscontaminants in both aqueous and terrestrial media

غلامرضا اعتماد

شمس، قريشي