Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"azo dye"”.
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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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Reactions of Congo Red and Azo Dye Congeners With Formaldehyde
Analysis of samples of Congo Red dye exposed to formaldehyde were found to form multiple products, including a colorless benzimidazole form previously characterized and an unidentified yellow compound. Congeners equivalent to half of the symmetrical Congo red molecule and related structures were …
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Biological Treatment of a Synthetic Dye Water and an Industrial Textile Wastewater Containing Azo Dye Compounds
… biological sludges to reduce and stabilize azo dye compounds was studied. Synthetic dye solutions and an industrial textile wastewater were both treated using anaerobic and aerobic biomass, separately and in sequential step-treatment processes. The primary objective was to reduce the …
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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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Organic materials for holographic applications
… in optical systems. A novel medium composed of azo dye molecules (methyl red sodium salt) and liquid crystals (PCB) was developed for holographic applications. A conformation change of azo dye molecules in cis-trans isomerization reorients liquid crystal molecules. Reversible polarization …
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Electrocoagulation for Water Treatment: the Removal of Pollutants using Aluminium Alloys, Stainless Steels and Iron Anodes
… electrodes in the treatment of phosphates, an azo dye and zinc ions dissolved in synthetic wastewaters. The synthetic wastewaters were designed to contain a mixture of ions with different conductivity values. Pure iron and an aluminium-indium-zinc electrode were identified as the most promising …
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Some aspects of the ultrastructure and enzyme cytochemistry of normal and virus-transformed cells
… microscopic enzyme cytochemistryi mainly by azo-dye methods. Differences in levels of activity are difficult to assess visually but microdensitometry shows that transformed 3T3 cells have higher acid phosphatase activity than normal cells. This is confirmed by biochemical assays which also …
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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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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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Vliv cytochromu b5 na enzymovou kinetiku hydroxylace Sudanu I lidským cytochromem P450 1A1
… I, which has previously been widely used as a azo dye in industry, but since 1980s it is banned for coloring food and cosmetics for its negative influence on the organism. NADPH:cytochrome P450 reductase is the major electron donor for cytochrome P450 catalyzed monooxygenation reactions. …
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Optical tweezers for signal detection and micromanipulation
… These spheres were then coated with an azo dye such that surface-enhanced resonance Raman (SERRS) measurements could be made on a single bead whilst it was simultaneously trapped in 532 nm optical tweezers. The length of time over which the SERRS signal could be recorded was increased, …
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Chemical characterization and aquatic biotoxicity testing of dye wastewaters and their reduction products
… from a reduced solution of a fiber-reactive azo dye. The identity and purity of this product was assessed through elemental composition analysis, high performance liquid chromatography (HPLC), gas chromatography/mass spectroscopy (GC/MS), and nuclear magnetic resonance spectroscopy (NMR). The …
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PERFORMANCE OF MODIFIED HETEROGENEOUS NOVEL PAN CATALYST FOR THE REMEDIATION OF REACTIVE ORANGE 16 (RO16)
… modified PAN Catalyst for the remediation of the azo dye Reactive Orange 16 (RO16). The modified PAN crosslinked catalyst comprises amidoxime, amidrazone groups chelated to iron 3+. The surface of these catalyst fibres also comprises particulates of iron oxide sulphate species. The effects of …
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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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Utilization of the Phanerochaete chrysosporium ligninolytic system and the potential for toxaphene degradation
… total organic halide analyses. Oxidation of the azo dye, Orange II, via spectrophotometric measurements was employed to determine the activity and reactivation of the fungal ligninolytic system. Degradation of toxaphene in the P. chrysosporium cultures was limited, with a maximum of 7% of the …
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Multimodal in-situ spectroscopy of novel enzyme mimics with optofluidic microreactors
… for the repeated degradation of the harmful azo dye pollutant amaranth in water. Both surfactant and surfactant-free approaches for the synthesis of Ag-AuNP were developed, allowing for highly tuneable size, shape and elemental composition properties. In addition, an optofluidic microreactor …
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Color removal in textile dye wastewaters by means of coagulation
… wastewater effluent, highly colored and stable dyes are formidable and somewhat insusceptible to removal treatment processes. Recent governmental regulations have made it necessary to remove most color before discharging the treated wastewater to surface waters. Chemical coagulation is …
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Ocean sensors - for marine environmental monitoring
… water, based on Greiss reaction that forms as Azo dye whose absorbance is measured at a wave length of 540nm. The design incorporates a green LED and integrated photo-detectors to make the nitrite sensor compact, with low-cost and low-power consumption.<br/><br/>A Conductivity, Temperature, …
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