Multicomponent ion exchange on clinoptilolite

Download

index.pdf

Date

2006

Author

Bayraktaroğlu, Kerem

Metadata

Show full item record

Item Usage Stats

223
views

127
downloads

Zeolites are crystalline, hydrated aluminosilicate minerals that are characterized by their ability to exchange some of their constituent cations with cations in aqueous solutions, without a major change in their crystalline structure. Clinoptilolite is the most abundant ype of zeolite and it has received extensive attention due to its favorable selectivity for mmonium and certain heavy metal cations. The aim of this study is to investigate the binary and ternary (multicomponent) ion xchange behavior of sodium form of Gördes type clinoptilolite for ammonium,cadmium and sodium ions. For this purpose, NH4 +-Na+,Cd2+-Na+ binary systems and NH4 +-Cd2+-Na+ multicomponent system were investigated both in batch and column systems at 0.1 and 0.01 constant total normality respectively and at 250C constant temperature. As a result of binary and ternary experiments, clinoptilolite’s affinity for both ions but greater affinity to NH4+ ion than Cd2+ ion was observed and the selectivity sequence of Gördes clinoptilolite was determined as NH4+>Cd2+>Na+ in binary and multicomponent batch and column operations. Additionally, total ion exchange capacities and maximum exchange levels of Gördes clinoptilolite for both ions were determined in batch systems whereas breakthrough capacities and column efficiencies (for three different flow rates) were determined in column systems. Finally, it was concluded that the increase of the flow rate reduced the breakthrough capacities and column efficiencies of Gördes clinoptilolite for ammonium and cadmium ions in multicomponent column systems involving more than one cation.

Subject Keywords

Chemistry.

URI

http://etd.lib.metu.edu.tr/upload/2/12607580/index.pdf
https://hdl.handle.net/11511/16357

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Asymmetric synthesis of chiral camphor fused pyridine type novel organocatalysts Küçükdişli, Murat; Tanyeli, Cihangir; Department of Chemistry (2009) Chiral pyridines as organocatalysts have been used in asymmetric organic synthesis in recent years. The asymmetric synthesis of camphor fused pyridine type novel organocatalysts were perfomed starting from cheap and easily available natural (+)-camphor. Using camphor fused pyridine skeleton, six organocatalysts 29, 32, 33, 38, 40, and 41were successfully synthesized. The first four nucleophilic and Lewis base catalysts 29, 32, and 33 are different P-oxides and P,N-dioxides which were tested in allylation of...
Stereoselective synthesis of cyclopentanoids and cyclitol derivatives originated from polychlorinated norbornene systems Gümüş, Ayşegül; Tanyeli, Cihangir; Department of Chemistry (2009) Optically active polychlorinated norbornene systems are important starting compounds for the synthesis of many complex molecules. The synthetic strategy of this study mainly depends upon the enzymatic resolution of hydroxymethyl-substituted polychlorinated norbornene structures. The enantiomerically enriched acetoxymethyl derivatives were synthesized in high ee values by several lipases. The absolute configuration of tetrachlorinated norbornene system was determined by X-ray analysis. The second part of the...
Inorganic antimony speciation using tungsten coil atom trap and hydride generation atomic absorption spectrometry Akay, Pınar; Ataman, Osman Yavuz; Department of Chemistry (2010) Antimony is a toxic element which is mostly found in two oxidation states (III and V) in environmental, biological and geological samples. Antimony may form various inorganic and organic compounds that exhibit differences in analytical behavior, toxicity and mobility; inorganic compounds of antimony are more toxic than organic forms and toxicity of Sb(III) has been shown to be 10 times higher than that of Sb(V). Therefore selective determination of Sb(III) and Sb(V) is required in environmental and biologic...
Voltammetric methods of reboxetine analysis and the mechanism of its electrode reactions Altunöz Erdoğan, Deniz; Erk, Nevin; Kilic, Esma (Walter de Gruyter GmbH, 2013-05-01) Reboxetine (RBX) electrochemical redox behavior at hanging mercury drop (HMDE) and glassy carbon electrodes (GCE) was studied in various pH Britton-Robinson universal buffers using cyclic voltammetry and square-wave voltammetry. RBX was reduced at the HMDE and oxidized at the GCE with reversible adsorption controlled and irreversible diffusion controlled processes respectively. The anodic peak is due to the amine and the cathodic peak may correspond to oxygen protonation. An oxidation reaction mechanism is ...
Lead (II) and ammonium exchange on Na form of Gördes clinoptilolite Aşiroğlu, Sedat; Yücel, Hayrettin; Department of Chemical Engineering (2006) Natural zeolites, especially clinoptilolite, have the ability of removing certain cations from wastewater by utilizing ion exchange and adsorption. In this study, ion exchange behaviour of Gördes clinoptilolite at particle size range (0.5-0.25 mm) for lead and ammonium removal was investigated to establish the conditions under which clinoptilolite may be used in an economical and effective manner. Experiments were divided into two parts. Batch and continuous (column) experiments were carried out. In the bat...

Citation Formats

K. Bayraktaroğlu, “Multicomponent ion exchange on clinoptilolite,” M.S. - Master of Science, Middle East Technical University, 2006.