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More than Color:Pigments with Thermal Storage Capacity;Processing and Degradation Behavior

Advances in Materials Physics and Chemistry 2015年第5期5卷 171-184页

作者： estibaliz aranzabe Pedro Maria Villasante Ricard March Maria Isabel Arriortua Aitor Larranaga Ana aranzabe IK4-Tekniker EibarSpain Nubiola Pigmentos S.L. LaudioSpain Facultad de Ciencia y Tecnología Universidad del País Vasco(UPV/EHU)LeioaSpain

A standard ultramarine pigment was used to produce phase change material composites, by adsorbing n-hexadecane paraffin around the pigment surface with the aim of obtaining a pigment providing thermal storage capacity apart from color. Vacuum impregnation method was employed optimizing the process variables to maximize the latent heat of the hexadecane/pigment composite. In addition to the process optimization, the stability of the composite having the maximum latent heat was investigated. The hexadecane/pigment composite providing the highest latent heat has a Latent heat of fusion of 44 J/g (around a 20%wt. hexadecane adsorbed in the pigment). Durability of the material was tested by thermo-diffractometric measurements. The results indicate slow reduction of the area intensity up to 6.5% after the 100 cycles.

关键词： Ultramarine Blue Hexadecane Phase Change Material Thermal Storage

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Heterogeneous Fenton Catalyst for the Efficient Removal of Azo Dyes in Water

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American Journal of Analytical Chemistry 2014年第8期5卷 490-499页

作者： Miren Blanco Amaia Martinez Arrate Marcaide Estíbaliz aranzabe Ana aranzabe Chemistry of the Surface Unit IK4-TEKNIKER Eibar Gipuzkoa Spain

Heterogeneous Fenton/photo Fenton type processes using a Fe-exchanged zeolite of Y-type have been applied for the degradation of a model textile synthetic water based on Black B azodye. Research work has been directed to compare process efficiency and to establish their advantages over corresponding homogenous Fenton type processes. By optimizing the amount of reactants and process conditions, a complete decolorization of the effluent and a reduction greater than 80 per cent in the total organic carbon content is achieved. The influence of solar radiation on the heterogeneous process has been also studied. Homogeneous and heterogeneous Fenton processes yielded similar decolorization and mineralization, but the concentration of Fe ions in the bulk after the treatment was not significant in the latter case. Moreover, the catalyst support can be reused in successive cycles without significant loss of effectiveness. The use of solar radiation as a source of energy for operating the process accelerates the decomposition of azodye, making the process economical and environmentally sustainable.

关键词： Zeolite Heterogeneous Fenton Catalyst Wastewater Treatment Dyes

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