Encontrados 36 documentos, a visualizar página 1 de 4
Influência da carbonatação no transporte de cloretos em argamassas submetidas à...
Malheiro, Raphaele; Camões, Aires; Ferreira, Rui Miguel; Meira, Gibson; Amorim, M. T. Pessoa de; Reis, RuiVol.2 ; Para assegurar a sustentabilidade das estruturas de betão armado é fundamental garantir a sua durabilidade. Neste contexto, conhecer o modo como estas estruturas reagem à ação dos agentes agressores assume grande importância. A corrosão dos varões de aço é o problema que mais afeta a durabilidade sendo que, a carbonatação e o ingresso de cloretos são as duas principais causas da corrosão. Apesar da açã...
Evolução da frente de carbonatação em argamassas contendo cinzas volantes tendo...
Malheiro, Raphaele; Camões, Aires; Ferreira, Rui Miguel; Meira, Gibson; Amorim, M. T. Pessoa de; Reis, RuiVol.1 ; A incorporação de cinzas volantes (CV) em matrizes cimentícias tem sido frequentemente utilizada com objetivo de tornar a matriz mais resistente à ação dos cloretos. Por outro lado, sabe-se que o Ca(OH) existente na matriz é parcialmente consumido pelas reações pozolânicas, o que facilita o avanço da frente de carbonatação. Tendo em conta que a ação conjunta entre a carbonatação e a penetração de clore...
A bi-layer electrospun nanofiltration membrane for plasmid DNA recovery from fe...
Correia, Tiago R.; Antunes, Bernardo P.; Castilho, Pedro H.; Nunes, José C.; Amorim, M. T. Pessoa de; Escobar, I. C.; Correia, I. J.; Morão, A.The demanding ever-increasing quantities of highly purified biomolecules by bio-industries, has triggered the development of new, more efficient, purification techniques. The application of membrane-based technologies has become very attractive in this field, for their high throughput capability, simplicity of operation and scale-up. Herein we report the production of a bi-layer membrane by electrospinning (ES...
Effects of coconut granular activated carbon pretreatment on membrane filtratio...
Silva, Flávia Vieira da; Yamaguchi, Natália Ueda; Lovato, Gilselaine Afonso; Silva, Fernando Alves da; Reis, Miria Hespanhol MirandaThis study evaluates the performance of a polymeric microfiltration membrane, as well as its combination with a coconut granular activated carbon (GAC) pretreatment, in a gravitational filtration module, to improve the quality of water destined to human consumption. The proposed membrane and adsorbent were thoroughly characterized using instrumental techniques, such as contact angle, Brunauer–Emmett–Teller) and...
Plasmid DNA recovery from fermentation broths by a combined process of micro- a...
Nunes, José C.; Morão, A.; Nunes, Catherine; Amorim, M. T. Pessoa de; Escobar, I. C.; Queiroz, J. A.Microfiltration and ultrafiltration operations were used in tandem to isolate and purify a 6050 bp plasmid DNA (pDNA). To achieve primary isolation of the plasmid from fermentation broths, immediately after cell lysis, a 0.2 μm microfiltration membrane was selected for solid/liquid separation, which was performed in a diafiltration mode, as an alternative to centrifugation. Then to attain plasmid concentration ...
Decolorization of the phthalocyanine dye reactive blue 21 by turnip peroxidase ...
Silva, Maria Cristina; Corrêa, Angelita D.; Amorim, M. T. Pessoa de; Parpot, Pier; Torres, Juliana A.; Chagas, Pricila Maria BatistaPeroxidases can be used in decolorization processes and the treatment of textiles effluents. This study evaluates the potential of the turnip peroxidase enzyme in the decolorization of the phthalocyanine textile dye Reactive Blue 21 (RB21). Some factors such as pH, the amount of H2O2 and the enzyme were evaluated in order to determine the optimum conditions for the enzyme performance. The reaction products form...
Obtention of plant peroxidase and its potential for the decolorization of the r...
Silva, Maria Cristina; Torres, Juliana A.; Corrêa, Angelita D.; Bernardes, Allana Maria; Amorim, M. T. Pessoa de; Santos, Custódio DonizetePeroxidases can be used in the decolorization process. There is a growing interest for new sources of this enzyme and for obtaining economically viable processes. In this work, a low-cost vegetable peroxidase extraction process is proposed; the resulting enzyme is characterized to determine its optimum pH, temperature, and stability conditions, and it is then applied in the decolorization of reactive dye Remazo...
Descoloração de corantes industriais e efluentes têxteis simulados por peroxida...
Silva, Maria Cristina; Corrêa, Angelita D.; Torres, Juliana A.; Amorim, M. T. Pessoa deThe removal of important textile dyes by turnip peroxidase (TNP) was evaluated. The textile effluents besides the residual dyes contain also chemical auxiliaries such as salts, dispersing and wetting agents. The effect of these was evaluated in the removal of the dyes reactive blue 21 and reactive blue 19 by TNP in synthetic effluents. A decrease of the efficency decolorization was observed. The action of the e...
Processo UV/H2O2 como pós-tratamento para remoção de cor e polimento final em e...
Hassemer, M .E. N.; Coral, Lucila Adriani; Lapolli, F. R.; Amorim, M. T. Pessoa deSeveral problems are involved the treatment plants of textile effluents, mainly the low efficiency of color removal. This paper presents an alternative of post-treatment by UV/H2O2 process, for color removal in biologically treated textile effluents. The tests were performed in a photochemical reactor and samples were taken at different times to perform analyses. Using 250 mgH2O2.L-1, 96% removal of color was v...
Arsenic removal from drinking water by advanced filtration processes
Duarte, António A. L. Sampaio; Oliveira, Sara L. C.; Amorim, M. T. Pessoa deAll over the world the presence of arsenic in water sources for human consumption has been raising great concern in terms of public health since many epidemiologic studies confirm the potential carcinogenic effect of arsenic. Because arsenic removal is the most frequent option for safe drinking water, the development of more efficient and sustainable technologies is extremely important. Membrane separation proc...
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