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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...
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.
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...
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...
Production and characterization of activated carbons made from sunflower stems
Valente Nabais, Joao; Laginhas, Carlos; Carrott, Peter; Ribeiro Carrott, ManuelaActivated carbons (ACs) are artificial materials, prepared from natural or synthetic precursors that are worldwide extensively used. The ACs main characteristics are the noticeable adsorption capabilities provided by the highly developed porous structure and the rich surface chemistry. Because of their versatility and properties the final material can be tailored to have specific properties suitable for a wide ...
PRODUCTION OF CARBON MATERIALS BY CONJUNCTION OF HYDROTHERMAL AND ACTIVATION PR...
Valente Nabais, Joao; Laginhas, Carlos; Carrott, Peter; Ribeiro Carrott, Manuela; Titirici, Magdalena; Roman, SilviaActivated Carbons (AC) are traditionally produced by chemical or physical activation processes, frequently using biomass materials as precursors [1]. These procedures can be modified in order to create particular surface characteristics (both textural and chemical), so that the adsorption of a given organic or inorganic compound is optimized. Recently, the use of hydrothermal carbonization processes (HTC) to pr...
Removal of amitriptyline from simulated gastric and intestinal fluids using act...
Valente Nabais, João M.; Ledesma, Beatriz; Laginhas, CarlosIn this work, the adsorption behavior of a tricyclic antidepressant, amitriptyline hydrochloride, onto several activated carbons (ACs) is reported. The adsorption was done using in vitro simulated gastric and intestinal fluid at 37◦C to test the performance of the carbons as treatment in overdose cases. The tested materials were one commercial AC (carbomix) and two ACs produced in our laboratory. The highest ad...
A vida para alem da morte dos produtos agrícolas.
Nabais, Joao; Laginhas, Carlos; Carrott, Peter; Ribeiro carrott, Manuela; Roman, SilviaEStudo da utilização de vários residuos agricolas para a produção de carvões activados
Systems involving hydrogenated and fluorinated chains: Volumetric properties of...
Morgado, Pedro; Lewis, J. Ben; Laginhas, Carlos M. C.; Martins, Luis F. G.; McCabe, Clare; Blas, Felipe J.; Filipe, Eduardo J. M.As part of a combined experimental and theoretical study of the thermodynamic properties of perfluoroalkylalkanes (PFAAs), the liquid density of perfluorobutylpentane (F4H5), perfluorobutylhexane (F4H6), and perfluorobutyloctane (F4H8) was measured as a function of temperature from 278.15 to 353.15 K and from atmospheric pressure to 70 MPa. The liquid densities of n-perfluoropentane, n-perfluorohexane, n-perflu...
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