حذف رنگ از پساب توسط مهره هاي مغناطيسي آلژينات/نانو ذرات Fe3O4 تحت ميدان مغناطيسي

چكيده انگليسي :

Dye removal from wastewater by magnetic alginate beads Fe3O4 nanoparticles under magnetic field Heydar Rezaei heydar rezaei@ce iut ac ir Date of submission Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Masoud Haghshenasfard haghshenas@cc iut ac ir Ahmad moheb Ahmad@cc iut ac ir Abstract The discharge of toxic effluents from various industries causes the serious effects on water resource soil fertility aquatic organisms and ecosystem integrity Among all the treatment methods adsorption is one of the most effective methods for removal of dyes from wastewater The objectives of this research using of Fe3O4 nanoparticles encapsulated with alginate beads and investigate their efficiency in removal of methylene blue dye from aqueous solution In this study Fe3O4 nanoparticles coated with citrate ions and then encapsulated with sodium alginate Atomic absorption spectroscopy AAS was used for determination of magnetic beads compositions and Uv visible spectrophotometer was used for determination of dye adsorption rate Methylene blue adsorption was conducted in two system of batch and continuous The studies of adsorption isotherm and kinetic were done in continuous system The parameters of initial dye concentration content of adsorbent in dry basis contact time pH and intensity of magnetic field were studied with design of experiment by taguchi method and orthogonal array by 16 experiments in batch system The optimum condition of experiments were calculated with taguchi method in batch system initial dye concentration 20 ppm content of adsorbent in dry basis 1 g contact time 180 min pH 11 and intensity of magnetic field 293 gauss which in condition mean of dye removal predicted 59 122 and achieve to mean of dye removal 60 8 during confirmentional experiments The parameters of initial dye concentration dose of Fe3O4 used in adsorbent contact time and intensity of magnetic field were studied with design of experiment by taguchi method and orthogonal array by 16 experiments in equal optimum pH 11 and content of wet adsorbent 10 g in continuous system The optimum conditions of experiments were calculated with taguchi method in continuous system initial dye concentration 20 ppm dose of Fe3O4 used in adsorbent 1 g contact time 60 min and intensity of magnetic field 440 gauss In these conditions predict of Taguchi method for mean of dye removal was 85 68 that the mean of dye removal obtained from conformational experiments 86 88 is in good agreement with predicted value Equilibrium time of dye adsorption in continuous system calculated 90 min and the pseudo first order model has a good fitting with experimental data than pseudo second order and intraparticle diffusion models The experimental data have a good agreement with freundlich isotherm and dye adsorption onto adsorbent were physisorption and exothermic The maximum value of adsorption capacity at 293 15 K was calculated 106 38 mg g 1 Keywords Adsorption Iron oxide nanoparticles Methylene blue Taguchi method Isotherm and kinetic adsorption PDF created with pdfFactory Pro trial version www pdffactory com

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حذف رنگ از پساب توسط مهره هاي مغناطيسي آلژينات/نانو ذرات Fe3O4 تحت ميدان مغناطيسي

جذب سطحي , متيلن بلو , روش تاگوچي , ايزوترم و سينتيك جذب