396743 Effects of Aging Time and Crystallization Time and Temperature in the Synthesis of Ideal LTA Zeolites

Monday, November 17, 2014
Galleria Exhibit Hall (Hilton Atlanta)
Julia King, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ

With the rising global population, water recovery and purification are vital processes to sustainability as well as limited energy consumption.  The utilization of forward osmosis has the potential for a low energy-cost method of desalinating water.  A molecular sieve inclusion nanocomposite membrane may be designed with a layer of water-selective molecular sieve nanoparticles connected by a corrosion-resistant, water-impermeable polymer matrix.  Linde Type A (LTA) zeolites may be used for this application but must be synthesized to specifications limited by the membrane structure such as size.  The effects of aging time of the precursor solution and crystallization temperature and time were evaluated and the morphology of the synthesized zeolites were investigated using scanning electron microscopy.  The longer aging time proved to produce the smallest LTA zeolites, however these particles were not very cubic in structure.  Overall, a shorter crystallization time and lower crystallization temperature produced smaller particles. The synthesized particles were still too large for the membrane system. Inconsistencies in particle structure could stem from other synthesis steps. Further work will be done on the effects of combining these factors to create smaller more cubic and uniform LTA zeolites for the membrane use.

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