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Browsing Theses and Dissertations (Chemistry) by Title

Browsing Theses and Dissertations (Chemistry) by Title

Now showing items 1-20 of 79

2,2-Dithiobis(benzothiazole) complexes (Cd and Ni): Precursors to nanoparticles and electrochemical properties and interactions with Rhodamine B

Mabaso, Busisiwe Dagracia (Vaal University of Technology, 2021-10-13)

The ligand 2, 2-dithiobisbenzothiazole and it metal complexes have been a subject of interest in various fields but they have found to exhibit remarkable and prevalent biological and pharmacological activities. The ligand ...
Adsorption of Cr(VI) by iron oxide functionalized polyethyleneimine (PEI) coated activated carbon-silica composites

Qhubu, Mpho Cynthia (Vaal University of Technology, 2020-12-14)

Water scarcity due to limited resources and pollution of the little available water by organic and inorganic contaminants remains as one of the critical issues of the 21st century. Several treatment methods have been ...
Adsorption of nitrate and fluoride anions from aqueous solutions using doped magnetite-pinecone nanocomposites

Frans, Nonhlanhla (Vaal University of Technology, 2022-03-23)

The increasing rate of pollutants, such as nitrate and fluoride from industrial and agricultural sources in the environment, especially in water bodies, is becoming alarming. Excessive nitrate and fluoride concentration ...
Adsorption studies of toxic metal ions (Co(II), Ni(II), Cu(II), Cr(VI) and Pb(II)) and methylene blue using black cumin (Nigella sativa L.) seeds

Thabede, P. M. (Vaal University of Technology, 2021)

High levels of pollutants in water are found to have poisonous effects on human health. Due to increasing awareness about the environment and strict environmental regulations, wastewater treatment has become a very important ...
An adsorptive study of Pb(II), Cr(VI) ions and methylene blue dye by treated and untreated coral limestones in aqueous solution

Nkutha, Cynthia Sibongile (Vaal University of Technology, 2021)

For centuries the contamination of surface water has been problematic, especially in third world countries whereby socio-economic issues are prevalent. With the development of various technologies for surface water ...
Amino acid-capped metal selenide nanoparticles: their synthesis, characterization, optical and magnetic properties

Mokubung, Kopano Edward (2018-04)

Quantum dots (QDs) have already proven features that can be considered to improve their properties for biological applications. Metal selenide nanoparticles possess semiconducting behaviors that can vary with structural ...
Antimicrobial activity and dye photodegradation of titanium dioxide nanoparticles immobilized on polyacrylonitrile-cellulose acetate polymer blended nanofibers.

Nkabinde, Sibongile Chrestina (Vaal University of Technology, 2019)

Electrospinning is a method that has gained more attention due to its capability in spinning a wide variety of polymeric fibers and nanoparticles embedded in polymer fibers. Polymer blending has been considered the most ...
Antimicrobial activity of synthesized copper chalcogenides nanoparticles and plant extracts.

Mbewana, Nokhanyo (2019-03)

Chemical precipitation method is the most widely used of all methods for preparing good quality semiconductor nanoparticles. Several conditions are optimized for producing the desired size and shape of particles. The ...
Biodiesel Production by Transesterification of Waste Cooking Oil Using Modified Attapulgite.

Mabungela, Ntandokazi (Vaal University of Technology, 2019-10)

Biodiesel has an ability to solve the problem associated with the use of fossil fuels as a source of energy. The aim of this study was to produce biodiesel from waste cooking oil (WCO) by transesterification, catalysed ...
Cobalt and cadmium chalcogenide nanomaterials from complexes based on thiourea, urea and their alkyl derivatives : synthesis and characterization

Morifi, E. L. (2015)

Cadmium and cobalt complexes of urea and thiourea were synthesized using ethanol as a solvent. All complexes were refluxed at 70 - 80 °C, left to cool at room temperature, washed with methanol and acetone to remove impurities ...
Comparative study of the immunomodulatory effect of solar and photonically inactivated salmonella enteritidis on dendritic cells in-vitro

Adeniran, Dorcas Oluwaseun Taiwo (Vaal University of Technology, 2022)

Salmonellosis is a food and water-borne disease that affects humans, especially those that are immunocompromised as well as children and the elderly. This disease is caused by a variety of Salmonella species. Salmonella ...
Competitive biosorption of a mixture of cationic dyes from a multicomponent solution using modified pine cone powder

Ngema, Silindile Lucia (Vaal University of Technology, 2012-07)

The biosorption of methyl violet and methylene blue onto modified pine cone powder was studied. Single and binary component systems studies were carried out for the biosorption of methyl violet and methylene blue onto raw, ...
Copper oxide-carbon catalysts for the oxidation of methylene blue

Makamu, Anza Reliance (Vaal University of Technology, 2020)

Organic water pollutants such as dyes are difficult to biodegrade. In this study Fenton, photo-Fenton and photocatalysis were used to degrade methylene blue dye in the presence of copper oxide catalysts. The copper oxide ...
Correlation of saliva and serum antibody titre response to pneumococcal capsular polysaccharides

Madimabe, Metsekae Richard (Vaal University of Technology, 2017-10)

Background: Infants and young children under the age of 2 years are vulnerable to Streptococcus pneumoniae infections, especially those who are born in developing countries. Antibiotic therapy was an effective treatment ...
Determination of the antibacterial, antioxidant activity, isolation and characterisation of active compounds from the leaves of Rhys Leptodictia plant

Matamela, Tshifhiwa (2014-02)

Rhus leptodictya commonly known as a mountain karee belongs to the family Anacadeceae and has been used since antiquity in tradition medicine. In the present study antimicrobial and antioxidant potentials of the leaves of ...
Determination of volatile organic compounds in ambient air by using thermal desorber, sorbent tubes, canister and GC-MS

Mkhwanazi, Sipho Sydney (2009-06)

The dissertation deals with volatile organic compounds that evaporate from the water-oil separate in the refinery, which causes bad odour around the neighbouring communities, the existence of these compounds are being ...
Development and optimization of selective leaching processes for the extraction of calcium from steel slag in view of sequestering carbon dioxide

Kotoane, Alice Mpho (2013-05)

Several technologies are currently being developed to mitigate the greenhouse gas CO2. One of these promising processes is industrial mineral carbonation whereby alkaline industrial wastes are taken as raw material. The ...
Development of a sensitive electrochemical sensor based on carbon dots and graphitic carbon nitride for the detection of 2-chlorophenol and arsenic (III) in water

Moundzounga, Theo Herman Gael (Vaal University of Technology, 2021-02)

The presence of organic and inorganic pollutants in aqueous environments is one of the major challenges confronting man. It is therefore important to develop sensitive, versatile and cheap techniques for their detection. ...
Development of a simple technique for selective removal of cesium in wastewater in the presence of mixed alkali metals

Pholosi, Agnes (Vaal University of Technology, 2012-08)

Amongst treatment technologies, adsorption is rapidly gaining prominence because it can remove metal pollutants at low concentrations, economical, ease of operation, and the adsorbent can be regenerated for reuse. This ...
The dissolution of limestone, coal fly ash and bottom ash in wet flue gas desulphurization

Koech, Lawrence (2015-03)

Strict environmental regulation on flue gas emission has led to the implementation of FGD technologies in power stations. Wet FGD technology is commonly used because it has high SO2 removal efficiency, high sorbent utilization ...