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Electrocatalytic oxidation of oxalic and oxamic acids in aqueous media at carbo...
Ferreira, Marta; Pinto, Mara F.; Soares, O. S. G. P.; Pereira, M. F. R.; Orfão, J. J. M.; Figueiredo, J. l.; Neves, Isabel C.; Fonseca, A. Maurício C.The electrochemical oxidation of oxalic and oxamic acids on multiwalled carbon nanotubes (CNT) and on monometallic (Pd and Pt) and bimetallic (Pd-Cu, Pt-Cu) catalysts supported on multiwalled carbon nanotubes was investigated using cyclic voltammetry. The electrodes were prepared by dispersion of the catalytic material on Toray carbon (CT) using a Nafion/water solution. The kinetic parameters of the reactions w...
Treatment of wastewater containing mineral oil by sorption onto granulated cork
Ferreira, C.; Pereira, J.; Pintor, A.; Correia, P.; Silva, J.; Vilar, V.; Botelho, C.; Martins, Ramiro; Orfão, J.; Boaventura, RuiThe aim of this work is the development of a new method to remove oils from wastewaters, namely hydrocarbons. These contaminants, when present in high concentrations, are efficiently removed by physical and chemical processes, such as gravity separators, flocculation and flotation processes; however for low concentrations, these methods are not applicable [1]. Moreover, advanced separation processes such as mem...
Valorisation of cork by-products for the treatment of vegetal and animal oil co...
Pereira, J.P.; Ferreira, C.I.; Pintor, A.M.; Correia, P.; Silva, S.; Vilar, V.; Botelho, C.; Martins, Ramiro; Orfão, J.; Boaventura, RuiIn this study, cork granules, which are by-products of the cork processing industry, were used as biosorbents for the removal of vegetable and animal oils from water. Simple oil-in-water emulsions were created by ultrasonic emulsification and batch adsorption tests were performed by contacting cork with these emulsions for a defined period of time. A mass transfer model was able to predict adequately the kineti...
Utilização de resíduos ou subprodutos de cortiça para a eliminação de óleos e g...
Vilar, Vitor; Ferreira, C.; Pereira, J.; Pintor, A.; Botelho, C.; Martins, Ramiro; Órfão, J.; Boaventura, Rui; Correia, P.; Siva, S.Este trabalho pretende apresentar a cortiça como um material competitivo para a resolução de problemas ambientais, nomeadamente a eliminação de gorduras hidro-solúveis ou dispersas em águas. Os métodos convencionais de tratamento, que incluem processos físicos/químicos, são muito eficientes na remoção de óleos e gorduras em concentrações elevadas, mas são ineficazes quando estes poluentes estã...
Studies on sorption and regeneration of granulated cork for oil and grease removal
Pereira, J.; Ferreira, C.; Pintor, A.; Correia, P.; Silva, S.; Vilar, V.; Botelho, C.; Martins, Ramiro; Órfão, J.; Boaventura, RuiThe aim of this work is to develop a method to recover sorbed oil and grease from granulated cork, in order to promote biomass regeneration. Experimental procedure involved biomass saturation with oil, followed by chemical regeneration. Oil removal by elution was tested using HNO3 and NaOH solutions, cationic and anionic surfactants and organic solvents, namely carbon tetrachloride and n-hexane. Chemical desorp...
Activated carbon production from brewer’s spent grain lignin
Mussatto, Solange I.; Fernandes, Marcela; Rocha, George J. M.; Orfão, J. J. M.; Teixeira, J. A.; Roberto, Inês ConceiçãoActivated carbons are adsorbents that are industrially used in multiple processes for product separation and purification, and for the treatment of liquid and gaseous effluents. Despite its frequent use in the water and waste industries, activated carbons remain an expensive material. In view of the high cost and the tedious procedures for the preparation and regeneration of activated carbons, there is a contin...
Changes in cognitive function performance in patients after anesthesia
MACHADO, H.; PEREIRA, M.J.; ORFAO, J.; MENDONCA, D.; RIBEIRO, J.L.Acta Med Port. 2000 May-Jun;13(3):85-92. [Changes in cognitive function performance in patients after anesthesia]. [Article in Portuguese] Machado H, Pereira MJ, Orfão J, Mendonça D, Ribeiro JL. SourceServiço de Anestesiologia, Hospital Geral de Santo António, Porto. Abstract This study evaluates the mental performance of 112 patients (ASA grade 1 and 2) submitted to Orthopaedic, Urologic, Gynecologic, General...
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