The rapid increase in the world population has drastically increased the generation of organic solid waste. Currently, this is disposed of mainly in landfills, leading to environmental pollution that necessitates the development of new treatment technologies. Catalytic wet oxidation has been proven to be an effective technology for solid waste destruction and the elimination of hazardous organic compounds. The aim of this work is to explore the production of NiO, MnO 2 , Fe 2 O 3 and CuO as transition metal oxide catalyst coatings using plasma spraying. Little, if any, literature has been presented on the plasma spray deposition of these materials, so this work provides the first proof of concept and benchmark for future development. The coating compositions were quantified from XRD patterns and the coating thickness measured from cross-sectional optical images. The optimal coating from each composition was analysed by scanning electron microscopy to determine the coating microstructure and phase distribution.
The microstructures of the porous ceramics are improved considerably using polymethyl methacrylate (PMMA) as a pore template since particles tend to adsorb irreversibly at the air-water interface. This paper presents a versatile approach for the production of porous SiO 2 ceramics by a process of direct foaming with the addition of PMMA beads. The adsorption free energy of the colloidal suspension was found to be 2.0610 9 kT. A wet foam stability of .80% was achieved using the surfactant hexylamine (0.05 M), which resulted in a colloidal suspension with the highest surface tension (116.2 mN m 21 ).
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