| Summary: | 碩士 === 國立中正大學 === 化學所 === 94 === Radioactive cesium contamination of water is of serious social and environmental concern since it is a significant fraction of the radioactivity of the liquid waste. Nickel hexacyanoferrate (NiHCF) has been widely studied for separation and electrochemical sensing of Cs+ owing to their strong selectivity for Cs+ over other alkali cations. In this work, a novel material, multilayers of NiHCF immobilized within or on a porous propyl-ethylene diamine triacetate functionalized silica matrix, has been synthesized and characterized. Its uses as a novel cesium sorbent and cesium sensing material have been studied. As a cesium sorbent, this material was evaluated for selective removal of cesium ions in the presence of competing metal ions from water. Loading capacity of at least 1.69 mmole per g of sorbent material has been achieved. As a cesium sensing material, multilayers of NiHCF were coated on glassy carbon electrodes by multiple sequential adsorption for potentiometric sensing of cesium ions. A Nernst response with a slope of 31 mV/decade was obtained between 10-6 M and 1 M. The material was characterized through infrared spectroscopy, X-ray powder diffraction, cyclic voltammetry, X-ray energy dispersive spectroscopy and the Ni and Fe precursors were modeled by the PM3TM semiempirical method.
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