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 25 for “"Methyl orange"”.
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Electrochemical synthesis and characterisation of polypyrrole/chitosan films doped with molecular anions
… for the incorporation and release of methyl orange (a model anionic dopant), dexamethasone (an anti-inflammatory drug) and oxacillin (an antibiotic). All drug-doped films were grown at a constant potential of 0.80 V vs SCE until a charge density of 0.25 C cm-2 was achieved. Initially, …
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Nanoporous dialysis membrane for microfluidic neural probes
… membranes are used as the dialysis membranes for methyl orange in aqueous solution. The diffusion coefficient of methyl orange is 1.45×10^(-8) cm^2/s. The fabrication and characterization of nanoporous membranes in the thesis will help lead to the integration of the dialysis membranes onto neural …
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Investigation on Light-driven Photocatalyst-based Materials for Wastewater Cleaning and Environmental Remediation
… Ag3PO4 are mainly studied by degradations of methyl orange (MO) and rhodamine B (RhB) organic dyes. The effects of pH values and stabilities on photocatalytic performance are studied as well. The results reveal that the tube-like Ag3PO4 exhibits greatly high activities for the degradation of …
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Development of manganese oxide based nanostructures by wet chemical methods for enhanced energy storage and photocatalytic applications
… were further studied by the decomposition of methyl orange and methyl blue under UV irradiation. The results indicated that the 26-facet polyhedral Cu2O-Mn2O3 composite expressed excellent photocatalytic activities.
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Development of sustainable Pd-based catalysts for removal of persistent contaminants from drinking water
… for catalytic removal. The probe azo dye methyl orange (MO) enhanced catalytic reduction kinetics of a suite of oxyanions (i.e., nitrate, nitrite, bromate, chlorate, and perchlorate) and diatrizoate significantly but not N-nitrosodimethylamine (NDMA) with a variety of Pd-based catalysts. …
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Synthesis and applications of silver and palladium nano metal foams
… structure. Palladium NMFs was found to degrade methyl orange (MO). An aqueous MO solution will turn nearly colorless after only 10 h of mixing with 0.03g of palladium NMFs at room temperature under dark condition. Different concentrations of MO solution were also studied to compare the reaction …
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Síntese e caracterização de nanopartículas de óxidos de ferro e sua mistura com resíduos da cana-de-açúcar (bagaço e palha) para emprego nos processos de adsorção e fotocatálise heterogênea
… of iron oxides was evaluated using solutions of methylene blue, methyl orange and crystal violet dyes, obtaining a high percentage of discoloration, with samples characterized as amorphous hematite being the most promising with superior results of up to 98% conversion. The mixture of hematite …
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Development of a Novel TiO2-polymeric Photocatalyst for Water Purification both under UV and Solar illuminations
… both under UV and solar light. Aspirin and methyl orange were chosen as model compounds, as traces of these compounds were detected in the drinking water of South-Western Ontario. The freeze-dried film photocatalyst was observed to degrade organic compounds efficiently, under both UV and …
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Combining Thin Film Silver Nanoparticles and Microfluidics to Create Reusable and Versatile Surface-Enhanced Raman Scattering Devices
… devices are tested as SERS substrates, with methyl orange and malachite green used as Raman probe molecules, citrate is used as a washing agent to show the reusable nature of these devices. Enhancement factors and limits of detection were calculated highlighting the enhancing ability of the …
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Development of titanium dioxide nanoparticles/nanosolution for photocatalytic activity
… incorporated TiO2 showed highest performance for methyl orange degradation (93%) under fluorescent xxv light irradiation for 10 h. This follows by Zr-TiO2 (82%), Fe-TiO2 (75%) and Ag�TiO2 (43%). Meanwhile, the highest antibacterial performance was exhibited by Ag�TiO2. TEM images showed that …
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Directly enhancing the photocatalytic transformation of CO2 and water to renewable fuels.
… evaluation of the reactors was performed using methyl orange (MO) as a model compound and utilising TiO2 and ZnO. The reduction of CO2 and H2 evolution was performed over a range of novel catalysts in the optimised system developed, referred to as the propeller fluidised photo reactor (PFPR). A …
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The study of boiler saline concentrations and a determination of a more efficient boiler blowdown procedure
… 3. A straight line relationship exists between methyl orange alkalinity and total solids. This is shown in Fig. 5. This graph should be used in the plant to convert “M. O.” to total solids. 4. Neither pH nor specific gravity should be used to control boiler saline concentration. 5. If foaming …
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A Comparative Study on the Efficacy of Modified Clay Soil for the Decolouration of Acidic and Basic Textile Dyes: A Case Study
… black clay soil (smectite) in removing acidic (Methyl Orange, MO) and basic (Crystal Violet, CV) textile dyes was evaluated. A 1:3 modified smectite ratio was identified as the most effective adsorbent. Characterization using X-ray Fluorescence (XRF), Brunauer-Emmet-Teller (BET), X-ray …
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Development and testing of thin photocatalyst films
… using the oxidations of 4-chlorophenol and methylene blue, as well as the reductions of methylene blue and resazurin, in solution and ink forms. The photoactivity of TiO<sub>2</sub>-SEN film is measured against Pilkington Activ™ glass for each of these reactions, which is a commercial …
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Copper Oxide Nano Photocatalyst for Wastewater Purification using Visible Light
… reactivity towards the degradation of methyl orange compared to rhombic dodecahedral Cu2O nano crystals with all active (110):Cu facets. The chemical composition and architecture remain the same after repeating degradation tests. The high surface-to-volume ratio contributes to its …
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Cellulose-metal organic framework nanocomposite adsorbent films for water remediation
… adsorptive removal of organic dyes, particularly methylene blue (MB) from aqueous solutions. The adsorbent films consist of solvothermally synthesized metal-organic framework (MOF)/crystalline nanocellulose (CNC) composites, supported on a cellulose acetate (CA) substrate. Three adsorbent films …
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Hierarchical Supramolecular Assemblies Based on Host-Guest Chemistry between Cucurbit[n]uril and Azobenzene Derivatives
… homoternary complex formed between CB[8] and a methyl orange (MO) guest, which is the fastest CB[8]-based crystallisation to date. As a commonly used pH indicator, MO possesses an azobenzene moiety with both an electronically positive amino group and an anionic sulfonate group. At low pH values, …
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Carboxylate metallogels - an adventure in supramolecular chemistry
… their environment. Dyes bromocresol green and methyl orange were both sorbed, in different amounts, by the two carboxylate-iron(III) metallogels, Fe-5nite-DMF and Fe-tri-DMF. This was monitored using UV-visible spectrophotometry. Gas sorption experiments were performed using carbon dioxide, …
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The use of novel poly(allylamine) based amphiphilic polymers for drug delivery.
… amphiphilic polymers were further reacted with methyl orange to form quaternary ammonium moieties. The polymers were characterised by elemental analysis and nuclear magnetic resonance spectroscopy (NMR). In the aqueous environment the amphiphilic polymers formed nano self assemblies with …
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Encapsulation of iron(III) protoporphyrin IX and tetraphenylporphyrin in metal-organic frameworks for application as heterogeneous oxidation catalysts
… and Fe(III) tetraphenylporphyrin (Fe(III)TPP). Methyl orange (MO) adsorption was used as an initial model for substrate uptake in MOFs 1 and 2. MOF 1 showed good adsorption of MO (10.3 ± 0.8 mg.g-1 ) which could undergo in situ protonation upon exposure to aqueous HCl vapour. By contrast MO …
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