A5023413505- Mine drainage and remediation techniques
- Heavy metals in environment
- Adsorption and biosorption for pollutant removal
- Extraction and Separation Processes
- Radioactive element chemistry and processing
- Analytical chemistry methods development
- Geochemistry and Geologic Mapping
- Tailings Management and Properties
- Coal and Its By-products
- Geochemistry and Elemental Analysis
- Recycling and Waste Management Techniques
- Mercury impact and mitigation studies
- Arsenic contamination and mitigation
- Microplastics and Plastic Pollution
- Groundwater flow and contamination studies
- Clay minerals and soil interactions
- Minerals Flotation and Separation Techniques
- Chemical Synthesis and Characterization
- Metal Extraction and Bioleaching
- Moringa oleifera research and applications
- Radioactivity and Radon Measurements
- Heavy Metal Exposure and Toxicity
- Analytical Chemistry and Chromatography
- Water Quality and Pollution Assessment
- Hydrology and Watershed Management Studies
University of the Witwatersrand
2016-2025
Molecular Sciences Institute
2015
In order to improve the accessibility and user friendliness of an accurately pretrained stacking ensemble machine learning regressor used predict sulfate levels (mg/L) in Acid Mine Drainage (AMD), a Graphical User Interface (GUI) was developed using Python by combining human input with ChatGPT deployed Jupyter Notebook environment. This achieved prompts create error message feedback loop generate working code for GUI. allowed model be those no/low programming experience limited knowledge,...
This study reports the presence, concentration, and characteristics of microplastics (MPs) in tap water three suburbs Gauteng Province South Africa. Physical characterisation was conducted using stereomicroscopy scanning electron microscopy following staining MPs with Rose Bengal dye. The concentrations all samples ranged from 4.7 to 31 particles/L, a mean 14 ± 5.6 particles/L. Small-sized (<1 mm) fibrous-shaped were most abundant samples. Fibers accounted for 83.1% areas, followed by...
The objectives of this study were, firstly, to establish the mechanism by which modified clinoptilolite (in Na form) adsorbs lead ions and, secondly, assess extent influence pH on adsorption capacity. To end, experimental data have been fitted isotherms, thermodynamic and kinetic models. Based standard errors obtained during experiments, it was determined that accuracy prediction isotherm models considered for decreases in order: Dubinin-Raduschkevich (4.63%, average normalised deviation...
Phytochemicals of Cannabis sativa mainly for the use in different industries are that delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD). Pressurized hot water extraction (PHWE) is seen as an efficient, fast, green technique removal polar semi-polar compounds from plant materials. The PHWE was applied to extract cannabinoid seed. Response surface methodology used investigate influence time (5–60 min), temperature (50–200 °C) collector vessel (25–200 on recovery (THC), cannabinol (CBN),...
Microplastic pollution has become an environmental concern worldwide. In this study, the occurrence, abundance, and composition of microplastics (MPs) in sediment Vaal River, South Africa were assessed. Twenty-five samples collected from River using a Van Veen grab sampler, underwent digestion, density separation, filtration prior to physical chemical analysis. Following extraction, potential MPs visually identified under Nikon stereomicroscope, aided by characterization Raman spectroscopy....
Acid mine drainage is generated when mining activities expose sulphidic rock to water and oxygen leading generation of sulphuric acid effluents rich in Fe, Al, SO4 Mn with minor concentrations Zn, Cu, Mg, Ca, Pb depending on the geology hosting minerals. These must be collected treated before release into surface bodies. Mining companies are constant search for cheaper, effective efficient treatment technologies. This study assessed potential applying magnesite as an initial remediation step...