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Showing 1 to 20 of 33 for “"Azo dyes"”.
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Halogen derivatives of certain azo dyes
Project (B.S.)--University of Kansas, Chemistry, 1917. ; Includes bibliographic references.
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Fate of azo dyes in sludges
… of color and organic matter contributed by the azo dye, 'Reactive Black 5,’ and Navy 106 wash water from a textile mill were studied in sludges under aerobic and anaerobic conditions. The potential of the dyes to leach from landfills was also investigated using Toxicity Characteristic Leaching …
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The synthesis and examination of Azo dyes derived from novel couplers
… synthesis and examination of several series of azo dyes of general structure (I) where Y incorporates the terminal nitrogen atom in a five- or six-membered saturated heterocyclic ring system, and Ar is an aromatic carbocyclic or heterocyclic residue, often containing substituent groups. Results …
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Treatment of azo dyes in industrial wastewater using microbial fuel cells
Due to the extensive use of xenobiotic azo dyes in the colour industry and their proven mutagenic and cytotoxic nature, their treatment prior to discharge is essential and is legally enforced. However, currently used wastewater treatment technologies such as activated sludge systems, anaerobic …
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Contact allergy to textile dyes. Clinical and experimental studies on disperse azo dyes
Disperse dyes are the most common allergens among textile dyes. It is not known whether the purified dyes, impurities in the commercial dyes, or metabolites are the actual sensitisers. Moreover, it is not known whether those disperse dyes that are now present in test series are actually used in …
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Monitoring for sulfonated azo dyes and their degradation products in industrial and municipal wastewater
Sulfonated azo compounds are one of the most commonly used textile dyes. They pose an environmental problem because they can be difficult to degrade in municipal and industrial treatment systems and can cause effluent wastewaters to violate color standards. Methods were developed to monitor for …
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Removal of colour from solutions of azo dyes using bacterial cells (Shewanella strain J18 143)
… be capable of directly inducing the reduction of azo bonds in reactive azo dyes and, indirectly being involved in the reduction of azo/ketohydrazone chromophores in pigment molecules. Two approaches have been used to extend the applications of Shewanella strain J 18 143 in the treatment of textile …
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Development of a biocathode system in microbial fuel cells for improved treatment of azo dyes
… This work investigated the treatment of azo dye (Acid orange 7, AO7) in MFC utilising biological catalysts as replacements for platinum. Various ways of mitigating pH changes in the cathode of MFCs and its effect on laccase activity were studied initially. Use of Nafion 117 membrane …
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Part I. Coordination Compounds of Azo Dyes. Part Ii. The Stereochemistry of Certain Cobalt(iii) and Zirconium(iv) Complexes
Made available in DSpace on 2014-12-05T19:37:12Z (GMT). No. of bitstreams: 1 6000139.pdf: 3267171 bytes, checksum: 779ba896f017249e78b96333889d0048 (MD5) Previous issue date: 1959
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Design and optimization of an adsorption method for the removal of textile azo dyes from aqueous solutions using Plantago lanceolata
Submitted in fulfilment of the requirements of the degree of Master of Applied Science in Chemistry, Durban University of Technology, 2022.
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Preparation of the azo dyes; diazobenzene-acetoacet-alpha-naphthylamide; diazo-alpha-naphthylamine-acetoacetanilide and the isomeric meta- and para-nitro derivatives of diazobenzene-acetoacetanilide
I. Dyes were prepared by coupling para- and meta- nitroaniline and alpha-naphthylamine with aceto-acetanilide. II. Intermediates were prepared by condensing para- and meta-nitroaniline and alpha-naphthylamine with aceto-acetanilide. III. Dyes were prepared by diazotizing aniline and coupling with …
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An evaluation of the environmental fate of reactive dyes
Dyestuffs are widely used industrial chemicals, yet surprisingly little is known about their fate in the environment. The potential modes of transformation and removal of reactive dyes in treatment and in the environment are principally through anaerobic and aerobic biodegradation and …
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Anaerobic/aerobic degradation of a textile dye wastewater
… to the development of new, more stable textile dyes. These dyes, many of the azo type, are often incompletely degraded/removed in wastewater treatment plants, leading to the discharge of highly colored effluents to rivers and streams. Concerns by downstream users of that water have led to …
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Development of sustainable Pd-based catalysts for removal of persistent contaminants from drinking water
… higher selectivity, and extended lifetime. Azo dyes are wide-spread contaminants, and they are potentially co-exisiting with target contaminants amenable for catalytic removal. The probe azo dye methyl orange (MO) enhanced catalytic reduction kinetics of a suite of oxyanions (i.e., nitrate, …
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DEVELOPMENT OF PHOTOSYNTHETIC MICROBIAL FUEL CELLS FOR AZO DYE DEGRADATION
Azo dyes are xenobiotic, cytotoxic, and often mutagenic compounds commonly found in textile industry effluents. Their recalcitrant nature presents a major challenge to conventional wastewater treatment plants (WWTPs), which predominantly rely on the energy-intensive activated sludge process. This …
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