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Nonionic surfactants and dispersants for biopolishing and stonewashing with Hyp...
Zilz, Luana; Rau, Martinho; Budag, Nelson; Scharf, Mauro; Paulo, Artur Cavaco; Andreaus, JuergenCellulases are widely applied in textile finishing, such as for the removal of protruding surface fibrils to reduce pilling propensity and to achieve the worn-out look in denim garments. The main drawback of enzymatic denim processing is the back-staining of indigo, which reduces the desired blue–white contrast. Alongside an accurate selection of the type of cellulase or vigorous post-washing of the garments, t...
Tratamento de banhos de tingimento têxtil por processos foto-Fenton e avaliação...
Zanella,Geovani; Scharf,Mauro; Vieira,Giovana Aparecida; Peralta-Zamora,PatricioIn this work the treatment of textile dyeing baths by a sequential reductive-oxidative process was evaluated, aiming its utilization in new dyeing process. The results demonstrated that reactive dyes can be easily degraded by reductive processes mediated by zero-valent iron, a fact that induces decolorizations of about 80%. Sequential photo-Fenton processes permit almost total removal of the residual color with...
Especiação analítica de compostos de arsênio empregando métodos voltamétricos e...
Carvalho,Leandro Machado de; Nascimento,Paulo Cícero do; Bohrer,Denise; Scharf,Mauro; Silva,Marcos Rivail daThis paper provides a review on voltammetric and polarographic methods for the speciation analysis of inorganic and organic arsenic compounds in different matrices. A discussion on the main advantages of electroanalytical methods in comparison with other analytical methods employed for arsenic speciation is presented. The mechanistic aspects of the most relevant techniques employing cathodic and anodic strippin...
Pré-concentração de chumbo e cádmio em um sistema de micro extração líquido-líq...
Carasek,Eduardo; Tonjes,Jussara Wick; Scharf,MauroA method for determination of lead and cadmium in aqueous samples using solvent microextraction and dithizone as complexing agent with FAAS was developed. Solvent microextraction parameters were optimized. The effect of foreign ions on the extraction yields was studied. The extraction was carried out until the aqueous to organic phase ratio achieved a 250 fold preconcentration of metals. For preconcentration ti...
The application of catalase for the elimination of hydrogen peroxide residues a...
AMORIM,ALEXANDRA M.; GASQUES,MARCELO D. G.; ANDREAUS,JÜRGEN; SCHARF,MAUROResults of dyeing of cotton fabrics with a bifunctional reactive dye were significantly improved when the fabric after bleaching with hydrogen peroxide was treated with catalase for the elimination of hydrogen peroxide residues from the fabrics. Compared to processes with a varying number of washing steps, with and without commercial reducing agents, the consumption of water could be significantly reduced, with...
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