Synthesis and characterization of zeolites from sodium aluminosilicate solution

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dc.contributor.authorSiti Aida, Ibrahim
dc.date.accessioned2014-11-18T07:33:35Z
dc.date.available2014-11-18T07:33:35Z
dc.date.issued2007
dc.descriptionMasteren_US
dc.description.abstractA series of synthetic zeolites were successfully synthesized from sodium aluminosilicate solutions with varying Si concentration from 1 to 8 molar using fumed silica and sodium aluminate. The order of mixing and the effect of varying amount of Si in the sodium aluminosilicate solution towards gelation, crystallization, phases, physico-chemical characteristics and surface morphology were studied. Data concerning the in-situ monitoring of sodium aluminosilicate gelation behavior and the crystallization time at room temperature are reported. XRD results showed that the phases of zeolites synthesized are similar to FAU, LTA, SOD and GIS framework. The crystallite size was found to vary from 3 to nearly 20 nm. The physico-chemical characteristics of the product were obtained from Malvern particle size analyzer, BET and FTIR. From Malvern analysis, it was found that the average particle sizes (d50) of synthetic zeolites were varied from 12 micron to 95 micron while the highest surface area values obtained from BET was about 9.84 m2/g. Meanwhile, FTIR spectra exhibited the presence of internal Si-O-(Si) and Si-O-(Al) vibrations in the tetrahedra or alumino- and silico-oxygen bridge in the range of 1200 – 400 cm-1, while the presence of zeolite water in the range of 1600- 3700 cm-1 and the pseudo-lattice vibrations of structural unit in the range of 500-700 cm-1. Surface morphological studies obtained from SEM photomicrographs showed the powdered synthetic zeolite have a lamellar structure with cubical edge and the crystal size was estimated to be 1 to 1.2 micron. TEM photomicrographs showed the presence of pores with the pore sizes estimation at 13-23 nm (width) and 18-43 nm (length). Finally, the highest CEC value of the synthesized zeolites against ammonium was obtained at 66.3 meq/100g meanwhile the lowest was at 7.65 meq/100g at optimum contact of 12 hours.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/559
dc.language.isoenen_US
dc.subjectMaterials and Mineral Resources Engineeringen_US
dc.subjectZeolitesen_US
dc.subjectSodium Aluminosilicate Solutionen_US
dc.titleSynthesis and characterization of zeolites from sodium aluminosilicate solutionen_US
dc.typeThesisen_US
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