Direct Dyes
Mostrando 1-12 de 38 artigos, teses e dissertações.
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1. Water-Soluble Benzazole Dyes Fluorescent by ESIPT: Structural Characterization, Photophysical Properties and Its Application as a Probe for Direct Staining of Helminths
A series of four water-soluble benzazole dyes that emit fluorescence by the excited state intramolecular proton transfer (ESIPT) mechanism were structurally characterized by Fourier transform infrared spectroscopy (FTIR), 1H and 13C nuclear magnetic resonance (NMR) attached proton test (APT) and mass spectrometry. Their photophysical properties were systemat
J. Braz. Chem. Soc.. Publicado em: 2019-03
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2. KINETIC BEHAVIOR OF SOME AZO DYES DECOLORIZATION BY VARIATION OF ZINC OXIDE AND TITANIUM DIOXIDE CONCENTRATIONS
The decolorization of three monoazo dyes (acid orange 7, direct orange 34, and methyl orange), one diazo dye (direct yellow 86) and one tetraazo dye (direct red 80) were mediated by n-type semiconductors as ZnO and TiO2 under pseudo-first order conditions at 30 ºC. The decolorization rate constants of these azo dyes were determined, varying the semiconducto
Quím. Nova. Publicado em: 2018-03
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3. Biosorption of anionic textile dyes from aqueous solution by yeast slurry from brewery
ABSTRACT This study investigated the biosorption of the anionic textile dyes: Reactive Red 239 (RR239), Reactive Black B (RBB) and Direct Blue 85 (DB85) according to pH, biomass dosage, contact time and dye concentration onto waste beer yeast slurry. The kinetics and isotherm of the removal of dyes were also studied. The equilibrium of biosorption reaction w
Braz. arch. biol. technol.. Publicado em: 11/05/2017
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4. Decolorization of azo dyes (Direct Blue 151 and Direct Red 31) by moderately alkaliphilic bacterial consortium
Abstract Removal of synthetic dyes is one of the main challenges before releasing the wastes discharged by textile industries. Biodegradation of azo dyes by alkaliphilic bacterial consortium is one of the environmental-friendly methods used for the removal of dyes from textile effluents. Hence, this study presents isolation of a bacterial consortium from soi
Braz. J. Microbiol.. Publicado em: 2016-03
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5. New copolymer of acrylamide with allyl methacrylate and its capacity for the removal of azo dyes
The copolymerization reactions of Acrylamide (AA) with the different mole ratios of allyl methacrylate (AMA) such as 25/75, 50/50 and 75/25 were studied by radical polymerization under argon atmosphere using 2,2’-Azobis (isobutyronitri1e) (AIBN) as initiator. The copolymers were characterized with Fourier transform infrared spectroscopy (FTIR) and thermogr
Polímeros. Publicado em: 2015-04
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6. Síntese e caracterização de poliuretano à base de óleo de Mabea fistulifera Mart. e sua utilização para remoção de corantes têxteis / Synthesis and characterization of Mabea fistulifera Mart. oil based polyurethane its use for textile dyes removal
Hard polyurethane polymers (PU-1, PU-2, PU-3 and PU-4) were developed in this study, obtained from polyols derived from Mabea fistulifera Mart oil. The chemical modification of the oil occurred through an in situ hydroxylation reaction employing acetic acid, hydrogen peroxide and sulfuric acid. The reaction conditions were optimized using a factorial composi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2011
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7. Remoção de corantes em efluentes têxteis utilizando espumas de poliuretano e resíduos de sementes de Mabea fistulifera Mart. / Dye removal in textile effluents using polyurethane foams and residues of Mabea fistulifera Mart.
The absorption is successfully used in removing the organic contaminants found in textile effluent. This work proposes the use of alternative absorbents to remove the direct dyes (Direct Red 80) and reactive (Reactive Blue 21) in aqueous solutions and in effluent samples. Two absorbents were tested: the synthetic polyurethane foams (EPUs) and the seed residu
Publicado em: 2009
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8. Estudo da degradação de corante têxtil em matrizes aquosas por meio dos processos oxidativos avançados O3-H2O2/UV e foto-Fenton. / Study on the degradation of a textile dye in aqueous matrices by the oxidative processes O3-H2O2/UV and photo-Fenton.
The textile industry generates large volumes of wastewater with high organic load, strong coloration and toxicity. In this work, the treatment of an aqueous solution containing the dye Solophenyl Yellow Arle 154% was studied by the O3-H2O2/UV and photo-Fenton processes, in order to evaluate the responses color removal after 5 minutes; color removal after 60
Publicado em: 2009
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9. Estudo da desativação do agente VX usando o MgO por cálculos ab initio
The organophosphates are used in industry, in the fields of dyes, varnishes, artificial leather, electrical insulation, waterproofing, plastics, oil additives and solvents, are also used in medicine to treat diseases such as glaucoma, in the household and in agriculture are applied as insecticides and pesticides. Besides these various civilian facilities, th
Publicado em: 2009
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10. Remoção de corantes em solução aquosa e efluentes de indústrias têxteis através de adsorção em cabelo humano / Removal of dyes in water solutions and effluents of textile industries through adsorption on human hair
The color of textile effluent resulting from dyeing processes has been one of the main environmental problems faced by textile industries in recent times, regarding the contamination of natural waters. These effluents are characterized by varied composition and because they are highly colorful due to the presence of dyes that cannot fix themselves during the
Publicado em: 2008
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11. Simple and sensitive spectrophotometric methods for the determination of acebutolol hydrochloride in bulk sample and pharmaceutical preparations
A direct, extraction-free spectrophotometric method has been developed for the determination of acebutolol hydrochloride (ABH) in pharmaceutical preparations. The method is based on ion-pair complex formation between the drug and two acidic dyes (sulphonaphthalein) namely bromocresol green (BCG) and bromothymol blue (BTB). Conformity to Beer's law enabled th
Eclética Química. Publicado em: 2008
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12. Heterodimeric DNA-binding dyes designed for energy transfer: synthesis and spectroscopic properties.
Heterodimeric dyes are described which bind tightly to double-stranded (dsDNA) with large fluorescence enhancements. These dyes are designed to exploit energy transfer between donor and acceptor chromophores to tune the separation between excitation and emission wavelengths. The dyes described here absorb strongly at the 488 nm argon ion line, but emit at di