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Surface and porous characterisation of activated carbons made from a novel biom...
Nabais, Joao; Laginhas, Carlos; Ribeiro Carrott, Manuela; Carrott, Peter; Crespo Amoros, Jose; Nadal Gisbert, AntonioIn the work now reported the production of activated carbons from a novel precursor, esparto grass, by activation with carbon dioxide is presented. The results show that the materials produced have interesting properties, namely BET apparent surface area and pore volume up to 1122 m2 g−1 and 0.46 cm3 g−1, respectively. The activated carbons have basic characteristics with point of zero charge between 9.25 and 1...
Production of low-cost adsorbents with tunable surface chemistry by conjunction...
Roman, Silvia; Valente Nabais, Joao; Ledesma, Beatriz; Gonzalez, Juan; Laginhas, Carlos; Titirici, MariaWe report a new methodology to produce activated carbons from biomass-derived hydrothermal carbons using air and carbon dioxide. The activation step is crucial to develop porosity in the hydrothermal carbons. Additionally different surface functionalities are also introduced on the surface of the final materials. Our method based on initial hydrothermal carbonization of lignocellulosic biomass (walnut shell, su...
Health and Lifestyles in Young Adults with Type 1 Diabetes
Serrabulho, Lurdes; Valente Nabais, Joao; Raposo, Joao; Gaspar de Matos, MargaridaThe social, occupational, familiar and emotional changes during emerging adulthood, can affect adherence to diabetes management tasks and quality of life of young adults with type 1 diabetes. Aims The objectives consisted on the evaluation of behaviours and lifestyles, psychological adaptation and social support of young adults with type 1 diabetes. Methods This research included a quantitative study with 278 ...
Produção de materiais de carbono a partir de carbonização hidrotérmica
Laginhas, Carlos; Valente Nabais, Joao; Carrott, Peter; Ribeiro Carrott, ManuelaNo presente trabalho é reportado a produção e caracterização de carvões activados por um processo de carbonização hidrotérmia a partir de açucares simples e complexos.
Near-rational expectations and the Phillips Curve : an empirical application
Nabais, João Miguel CasanovaMestrado em Economia Monetária e Financeira ; The purpose of this work is to present and empirically test the Akerlof, Dickens and Perry (2000) model for two euro area countries, Portugal and Germany. The main purpose is to derive estimates for the Near Rational Phillips Curve and verify if the implications of ADP do apply to the current preference of the European Central Bank for an inflation target below the...
Propriedades estruturais e estabilidade hidrotérmica de titanosilicatos do tipo...
Velho, Filipe; Galacho, Cristina; Carrott, Manuela; Carrott, Peter; Nabais, JoãoNeste trabalho apresentam-se os resultados da caracterização textural e da estabilidade estrutural de materiais mesoporosos ordenados, do tipo SBA-15, com elevado teor de titânio, que foram preparados por um método de síntese direta, por via hidrotérmica, designado por híbrido dado que se fundamentou nos procedimentos de síntese previamente estabelecidos na literatura.
Care, Education, protection – the Associação Protectora dos Diabéticis de Portu...
Valente Nabais, JoaoThe Portuguese Diabetes Association is the world’s oldest diabetes association and a senior Member Association of the International Diabetes Federation. From the moment it was founded, early in the 20th century, to the present day, the Associação has been driven by a single overarching objective: to improve the quality of life of people with diabetes. Involved nationally in diabetes advocacy and the provision o...
HYDROTHERMAL CARBONIZATION AS AN EFFECTIVE WAY OF DENSIFYING THE ENERGY CONTENT...
Valente Nabais, Joao; Roman, Silvia; Laginhas, Carlos; Ledesma, Beatriz; Gonzalez, JuanHydrothermal carbonization processes were studied under different conditions using two different biomass materials: walnut shell and sunflower stem. Coalification under mild conditions was promoted with the aim of increasing the calorific value of the solid hydrochar. Hydrocarbonization processes brought up an increase on the heating value of the materials up to 28.9 and 29.3 MJ kg−1, for sunflower stem and wal...
Study of the contributions of non-specific and specific interactions during flu...
Valente Nabais, Joao; Roman, Silvia; Gonzalez, Juan; Garcia, Carmen; Ortiz, AngelThe adsorption of fluoxetine onto activated carbons (ACs) prepared from almond tree pruning by steam and CO2 activation under different temperature conditions (650– 9508C), was studied. In both series increasing the temperature caused an increase in the BET apparent surface area, yielding ACs with SBET up to 870 and 710m2 g 1 after steam and CO2 activation, respectively. Also, a slight widening of the porosity ...
Removal of amitriptyline from aqueous media using activated carbons
Valente Nabais, Joao; Ledesma, Beatriz; Laginhas, CarlosThis paper reports the removal of amitriptyline, a widely used tricyclic anti-depressant, from aqueous solutions by six activated carbons produced from cork, coffee endocarp and eucalyptus pulp. The results of this study showed that samples from cork and eucalyptus pulp, activated at 800 °C, exhibited the highest adsorption capacity of 120 mg/g and 110 mg/g, respectively. Samples produced from coffee endocarp s...
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