| Summary: | 碩士 === 國立中山大學 === 化學系研究所 === 107 === Ceria NPs show outstanding chemical activity due to more oxygen vacancies on the particle surface and high specific surface area compared to bulk ceria. CeO2 NPs with different shape (nano-cubes, nanorods, and polygonal) were prepared, and the effects of differences between these shapes on de-phosphorylation (paraoxon ethyl) were systematically investigated, from the experimental results were observed that (111 & 110) planes of terminated surface (CeO2 NPs) is more reactive than the (200) plane surfaces for better catalytic activity, this can be further tuned by PDDA stabilized CeO2 NPs as highly active and efficient catalysts for de-phosphorylation of paraoxon ethyl in the presence of alkaline pH. PDDA could serve as an electron acceptor from AuNPs to produce the net positive charges on the surface, which provide strong electrostatic attraction with negatively charged phosphorus group and borohydride ions. The activity parameter and rate constant of PDDA-capped AuNP’s stabilized CeO2 NPs were higher than those of PDDA-stabilized CeO2 NPs. AuNP’s can increase the electron transfer efficiency, it can be further improved by reduction 4-nitrophenol to 4-aminophenol. So we designed the combination of PDDA-capped AuNP’s stabilized CeO2 NPs by electrostatic attraction, which can be utilized to decompose paraoxon ethyl, and this can be further employed to application studies of environmental water samples (river water & sea water).
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