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dc.contributor.advisorEroğlu, Ahmet Eminen
dc.contributor.authorŞeker, Ayşegül-
dc.descriptionThesis (Master)--İzmir Institute of Technology, Chemistry, İzmir, 2007en
dc.descriptionIncludes bibliographical references (leaves: 75-83)en
dc.descriptionText in English; Abstract: Turkish and Englishen
dc.descriptionxi, 83 leavesen
dc.description.abstractIn the assessment of environmental quality, one of the priorities must be given to the determination of heavy metals. In the present study, Spirulina platensis, a cyanobacteria (or blue-green alga) was suggested to be used as a biosorbent prior to the atomic spectrometric determination of Pb, Cd and Ni in some environmental samples. For this purpose, the parameters which might be effective on the biosorption were investigated such as pH, time, initial metal ion concentration, biosorbent amount, temperature, kinetics of sorption, repetitive reactivity and ionic competition. According to the sorption kinetics, results obeyed well the pseudo second-order model. Freundlich, Dubinin Radushkevich and Temkin isotherm models were applied in describing the equilibrium partition of the ions. Freundlich isotherm was applied to describe the design of a single-stage batch sorption system. Thermodynamic parameters (.G0, .H0 and .S0) were calculated and the sorption process was found to be largely driven towards the products and it had an endothermic nature. Faster adsorption kinetics was observed for Pb2+ ions in comparison to Cd2+ and Ni2+ ions. Based on kinetic modeling, the apparent activation energy, Ea, was calculated to be 44 kJmol-1, -16 kJmol-1 and 54 kJmol-1 for Pb2+, Cd2+and Ni2+, respectively. The measurements of the repetitive reusability of Spirulina platensis indicated a large capacity towards the three metal ions. Sorption activities in a three metal ion system were studied and at an initial metal concentration of 100.0 mgL-1, % Pb2+ was found to be still high (85%).However, it decreased to less than 20% for Cd2+ and Ni2+ indicating the relative selectivity of the biosorbent towards Pb2+. Finally, the use of Spirulina platensis, in its natural form or after be immobilized onto various matrices (alginate, silicate, carboxymethylcellulose and polysulfone) was planned for the separation of heavy metals from the sample matrix.en
dc.publisherIzmir Institute of Technologyen_US
dc.subject.lccQR92.M45 S46 2007en
dc.subject.lcshHeavy metals--Absorption and adsorptionen
dc.subject.lcshAtomic spectroscopyen
dc.subject.lcshSpirulina platensis--Biotechnologyen
dc.titlePreconcentration of heavy metals in environmental samples by biosorption and determination by atomic spectrometryen_US
dc.typeMaster Thesisen_US
dc.institutionauthorŞeker, Ayşegül-
dc.departmentIzmir Institute of Technology. Chemistryen_US
item.openairetypeMaster Thesis-
item.fulltextWith Fulltext-
Appears in Collections:Master Degree / Yüksek Lisans Tezleri
Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
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