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چكيده انگليسي :

Adsorption of Methylene Blue from Aqueous Solution by Sodium Alginate Kaolin Beads Nader Marzban n marzban@ce iut ac ir Date of submission Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Ahmad Moheb ahmad@cc iut ac irAbstractToday with increasing water consumption and lack of water resources treatment of industrial waste waters to reusethese waters has been attracted very much attention of researchers Dyeing process in the textile industries withconsuming a large volume of water is one of the major sources of water pollution by dye materials The dyepollutants are generally non biodegradable and usually cause serious negative effects on the environment One ofthe effective approaches to removal of dye pollutants is using adsorption process by proper adsorbents The aim ofpresent work was synthesis of sodium alginate kaolin beads and evaluation of their performance for removal ofMethylene Blue from synthetic waste water Effects of different operating parameters initial dye concentration solution pH contact time stirring speed temperature and adsorbent dosage on the efficiency of the adsorptionprocess and its capability for removal of dye pollutant were investigated To evaluate the effect of each parameterthe experiments were designed by Response Surface Method Using RSM 54 experiments were carried out in abatch system According to the experimental results the highest efficiency for dye removal obtained 99 56 Usingresponse surface methodology optimized adsorption conditions were achieved as follows initial dye concentrationof 4 ppm adsorbent dosage of 1 g L stirring speed of 190 rpm pH of 8 contact time of 90 min and temperatureof 27 C Furthermore in a series of separate experiments the effect of salt concentration on the adsorption processwas explored and it was found that increasing the salt concentration in the solution had negative effects on the dyeremoval The amount of solution pH were measured before and after the adsorption process in order to determinethe zero point charge which was found equal to 6 4 In addition kinetic isotherm and thermodynamic studies werecarried out on the adsorption process to have a better understanding about the thermo kinetics aspects of the process By fitting the experimental data with isotherm and kinetic models it was observed that the adsorption processfollows Freundlich isotherm R2 0 99 and pseudo second order kinetic models R2 0 99 respectively Maximumdye removal capacity at 27 C was obtained 333mg g Negative values of G at different temperatures indicatedthat the adsorption process was spontaneous Also positive values of H revealed that the adsorption process wasendothermic The other thermodynamic parameter S had positive values showing the affinity of adsorbent foradsorbate and increasing randomness at the interface of solution and solid with some structural changes in theadsorbates and adsorbents during the adsorption process Keywords Adsorption Sodium alginate kaolin beads Methylene Blue Response surface methodolog

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جذب رنگ متيلن بلو از محلول هاي آبي با استفاده گويچه هاي سديم آلژينات - كائولن

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