Browsing Faculty of Natural Science by Author "Dept. of Chemistry"
Now showing items 1-20 of 85
-
Advanced low temperature metal hydride materials for low temperature proton exchange membrane fuel cell application
Ntsendwana, Bulelwa (University of the Western Cape, 2010)Energy is one of the basic needs of human beings and is extremely crucial for continued development of human life. Our work, leisure and our economic, social and physical welfare all depend on the sufficient, uninterrupted ... -
Amperometric biosensor systems prepared on poly (aniline-ferrocenium hexafluorophosphate) composites doped with poly(vinyl sulfonic acid sodium salt)
Ndangili, Peter Munyao (University of the Western Cape, 2008)The main hypothesis in this study is the development of a nanocomposite mediated amperometric biosensor for detection of hydrogen peroxide. The aim is to combine the electrochemical properties of both polyaniline and ... -
The application of high capacity ion exchange absorbent material, synthesized from fly ash and acid mine drainage, for the removal of heavy and trace metals from secondary co-disposed process waters
Hendricks, Nicolette Rebecca (University of the Western Cape, 2005)The objective of this study was to investigate the feasibility of the application of low cost high capacity inorganic ion exchange material, synthesized form collected fly ash and acid mine drainage solid residues, for the ... -
The application of novel multinuclear catalysts derived from dendrimeric ligands in the polymerization and oligomerization of unsaturated hydrocarbons
Malgas, Rehana (University of the Western Cape, 2007)G1 and G2 dendrimeric salicylaldimine ligands containing both substituted and unsubstituted aryl rings were synthesized via a Schiff base condensation of the appropriate salicylaldehyde and the peripheral amino groups of ... -
Biological properties of selected flavonoids of rooibos (Aspalathus linearis)
Snijman, Petra Wilhelmina (University of the Western Cape, 2007)Bioactivity-guided fractionation was used to identify the most potent antioxidant and antimutagenic fractions contained in the methanol extract of unfermented rooibos (Aspalathus linearis), as well as the bioactive principles ... -
Boron-doped Diamond Sensors for the Determination of Organic Compounds in Aqueous Media
Hess, Euodia (University of the Western Cape, 2010)In electrochemical oxidation treatment of wastewater, the electrode material is an important parameter in optimizing oxidative electrochemical processes, since the mechanism and products of several anodic reactions are ... -
Brine treatment using natural adsorbents
Mabovu, Bonelwa (University of the Western Cape, 2011)The current study investigated application of natural adsorbents in brine treatment. Brines are hypersaline waters generated in power stations and mining industries rich in Mg2+, K+, Ca2+, Na+, SO4 2- , Cl- and traces of ... -
Catalyst Coated Membranes (CCMs) for polymerelectrolyte Membrane (PEM) fuel cells
Barron, Olivia (University of the Western Cape, 2010)The main objective of this work it to produce membrane electrode assemblies (MEAs) that have improved performance over MEAs produced by the conventional manner, by producing highly efficient, electroactive, uniform catalyst ... -
The catalytic membrane reactor for the conversion of methane to methanol and formaldehyde under mild conditions
Modibedi, Remegia Mmalewane (University of the Western Cape, 2005)This thesis described the development of new catalytic system for the conversion of natural gas (methane) to liquid products such as methanol and formaldehyde. This technology can allow the exploitation of small and medium ... -
Cesium hydrogen sulphate and cesium dihydrogen phosphate based solid composite electrolyte for fuel cell application
Naidoo, Sivapregasen (University of the Western Cape, 2004)A new high temperature solid electrolyte composite was developed, with CsHSO4 and CsH2PO4 as the proton conducting material in composition with PTFE and SiO2 to enhance the solid electrolyte composites mechanical strength ... -
Characterization and chemical speciation modelling of saline effluents at Sasol Synthetic Fuels Complex-Secunda and Tukuta power station
Nyamhingura, Amon (University of the Western Cape, 2009)The study shows conclusively that brine composition and concentration is highly variable at these South African power utilities and processes such as RO, contact with ash and CO2 ingress can have an impact upon the overall ... -
Characterization of platinum-group metal nanophase electrocatalysts employed in the direct methanol fuel cell and solid-polymer electrolyte electrolyser
Williams, Mario (University of the Western Cape, 2005)Characterization of nanophase electrocatalysts, which are an essential part in the direct methanol fuel cell (DMFC) and solid-polymer electrolyte (SPE) electrolyser, have been studied in this work. Their nanoparticulate ... -
Chemical and biological investigation into some selected African indigenous medicinal plants
Babajide, Jelili Olalekan (University of the Western Cape, 2009)African medicinal plants are commonly used throughout Africa to treat a variety of ailments including wounds and ulcers, cough and chest complaints, gingivitis, fever and gonorrhoea, indication all related to infection and ... -
Chemical interactions and mobility of species infly ash-brine co-disposal systems
Fatoba, Ojo Olanrewaju (University of the Western Cape, 2010)The primary aim of these coal fired industries for co-disposing fly ash and brine was to use the fly ash as a sustainable salt sink. It is therefore important to study the interaction chemistry of the fly ash-brine systems ... -
CO2 sequestration using brine impacted fly fish
Muriithi, Grace Nyambura (University of the Western Cape, 2009)It was hypothesized that South African FA and brine could sequester CO2 through mineral carbonation. A statistical approach was undertaken to optimize the % CaCO3 formed from FA/brine/CO2 interaction with input parameters ... -
Composite low temperate hydrogen storage material on the basis of iron-titanium alloy ; synthesis and structure
Onyegbule, Nkele (University of the Western Cape, 2006)It is widely believed that hydrogen will within a few tens of years become the means of storing and transporting energy. The reason is the depletion of hydrocarbons and the relatively facile production of hydrogen from ... -
Composite poly(dimethoxyaniline) electrochemical nanobiosensor for glufosinate and glyphosate herbicides
Songa, Everlyne Apiyo (University of the Western Cape, 2008)In this thesis, I present a simple, sensitive and low cost electrochemical nanobiosensor for quantitative determination of the herbicides glufosinate, glyphosate and its metabolite aminomethylphosphonic acid (AMPA). Firstly, ... -
Consolidated nanomaterials synthesized using nickel micro-wires and carbon nanotubes
Davids, Wafeeq (University of the Western Cape, 2007)Nano-devices are the next step in the application of nanomaterials in modern technology. One area of research that is receiving an increased amount of attention globally is the fabrication of new nano-devices for applications ... -
Cytochrome C biosensor for the determination of trace level arsenic and cyanide compounds
Fuku, Xolile Godfrey (University of the Western Cape, 2011)In this work, an electrochemical method based on a cyt c biosensor has been developed, for the detection of selected arsenic and cyanide compounds. Boron Doped Diamond (BDD) electrode was used as a transducer, onto which ... -
Determination of fumonisins in maize by High Performance Liquid Chromatography with fluorescence and ultraviolet detection of o-phthaldialdehyde, naphthalene-2,3-dicarboxaldehyde and dansyl chloride derivatives
Ndube, Ncediwe (University of the Western Cape, 2011)Fumonisins, carcinogenic mycotoxins produced by various Fusarium species, occur naturally in maize and maize-based food products. They are hazards for animal and human health as they cause cancer in rodents and have been ...