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Recovery of precious metals from exhausted automotive catalysts by leaching and...
Nogueira, C. A.; Carvalho, G. I.; Costa, Maria Clara; Costa, Ana M. Rosa da; Paiva, A. P.Platinum group metals (PGM’s) are precious and rare metals used in many existing and emerging technologies such as electronics, catalysts, energy and medical appliances, among others. PGM’s applications and demand are growing rapidly, and their supply is short and considered critical. Recycling of residues containing PGM’s is therefore mandatory, in order to allow the continuity of supplying. The main market sh...
Integrated synthesis of nanosized semiconductors in a bioremediation system for...
Costa, J. P. da; Girão, Ana Violeta; Lourenço, J. P.; Monteiro, O. C.; Trindade, Tito; Costa, Maria ClaraThe use of sulfate-reducing bacteria in bioremediation process for the treatment of afluents with high-content of sulfate and metal generates an excess of sulfide.
New extractants for separation of platinium-group metals from chloride solution...
Paiva, A. P.; Carvalho, G. I.; Schneider, A. L.; Costa, Maria Clara; Costa, A. M.; Assunção, A. F.; Nogueira, C. A.In this paper some results on the application of four N,N’-tetrasubstituted malonamide derivatives for the extraction and separation of platinum-group metals (PGMs) are presented. The above mentioned extractants were specifically synthesized in order to evaluate their efficiency for the extraction of a specific metal, or group of metals, from aqueous chloride matrices. Different behaviours were obtained towards...
Use of biogenic sulfide for the synthesis of CuS nanocrystals and nanocomposites
Pinto da Costa, João; Girão, Ana Violeta; Lourenço, J. P.; Monteiro, O. C.; Trindade, Tito; Costa, Maria ClaraDuring the metabolism of organic matter (CH2O), sulfate-reducing bacteria (SRB) use sulfate as the terminal electron acceptor, resulting in the production of H2S. This biologically generated sulfide, in the presence of metal ions, can be used for metal precipitation (Bhagat et al., 2004). The use of SRB in bioremediation processes, namely, in the reduction of highcontent sulfate and metal effluents, is well doc...
Crescimento inicial de Euterpe edulis Mart. em diferentes regimes de luz
NAKAZONO,ERIKA MATSUNO; COSTA,MARIA CLARA DA; FUTATSUGI,KAORI; PAULILO,MARIA TEREZINHA SILVEIRAPlantas sob forte sombreamento (2% ou 6% da luz solar direta) apresentaram, em relação às plantas sob maior nível de luz, menor biomassa, menores taxas de crescimento, menor razão raiz/parte aérea, menor massa foliar específica (MFE), menor razão clorofila a/b e maior razão de área foliar (RAF). Com o aumento da irradiância as plantas apresentaram três tipos de comportamento, dependendo da quantidade de luz dad...
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