These properties make ZnO a promising material for uses in a broad range of applications including sensors, catalysis and optoelectronic devices. The presented research covers a broad spectrum of these interesting nanomaterials, from their synthesis and characterization to their use as photocatalyts.
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A new synthetic approach for producing morphology controlled ZnO nanostructures was developed using microwave irradiation MWI. The rapid decomposition of zinc acetate in the presence of a mixture of oleic acid OAC and oleylamine OAM results in the formation of hexagonal ZnO nanopyramids and ZnO rods of varying aspect ratios. The factors that influence the morphology of these ZnO nanostructures were investigated. Using ligand exchange, the ZnO nanostructures can be dispersed in aqueous medium, thus allowing their use as photocatalysts for the degradation of malachite green dye in water.
Photocatalytic activity is studied as a function of morphology; and, the ZnO nanorods show enhanced photocatalytic activity for the degradation of the dye compared to hexagonal ZnO nanopyramids. After demonstrating the catalytic activity of these ZnO nanostructures, various ways to enhance photocatalytic activity were studied by modification of this MWI method. Photocatalytic activity is enhanced through band gap modulation and the reduction of electron-hole recombination.
ZnO-based nanostructures were studied systematically through the entire process from synthesis and characterization to their use as photocatalysis. Sewwandi Rathnayake , University of Kentucky Follow. In order to properly evaluate the ecological and human health risks of ZnO Manufactured nanomaterials MNMs released to the environment, it is critical to understand the likely transformation products in the wastewater treatment process and in soils receiving biosolids.
To address this critical knowledge gap, we examined the transformation reactions of 30 nm ZnO MNMs in single component and multi-component systems, with phosphate and natural organic matter NOM. We also assessed the influence of nano ZnO transformation on the bioavailability, and toxicity of ZnO transformation products to Triticum aestivum.