Browsing Chemistry by Author "Petrik, Leslie"
Now showing items 1-20 of 29
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Application of nano zinc oxide (nZnO) for the removal of triphenyltin chloride (TPT) from dockyard wastewater
Ayanda, Olushola S.; Fatoki, Olalekan S.; Adekola, Folahan A.; Petrik, Leslie; Ximba, Bhekumusa J. (Water Research Commission, 2014)The use of triphenyltin chloride (TPT), a persistent organic pollutant, as a biocide has led to serious contamination of the marine environment. The potential of nano zinc oxide (nZnO) for the removal of TPT from contaminated ... -
Carbonation of brine impacted fractionated coal fly ash: Implications for CO2 sequestration
Muriithi, Grace; Gitari, Wilson; Petrik, Leslie; Ndungu, Patrick (Elsevier, 2011)Coal combustion by-products such as fly ash (FA), brine and CO2 from coal fired power plants have the potential to impact negatively on the environment. FA and brine can contaminate the soil, surface and ground water through ... -
Chemical, mineralogical and morphological changes in weathered coal fly ash: A case study of a brine impacted wet ash dump
Eze, Chuks P.; Nyale, Sammy M.; Akinyeye, Richard O.; Gitari, Wilson; Akinyemi, Segun A.; Fatoba, Olanrewaju O.; Petrik, Leslie (Elsevier, 2013)The mobility of species in coal fly ash (FA), co-disposed with brine using a wet ash handling system, from a coal fired power generating utility has been investigated. The study was conducted in order to establish if the ... -
Comparison of CO2 capture by ex-situ accelerated carbonation and in in-situ naturally weathered coal fly ash
Muriithi, Grace N.; Petrik, Leslie; Fatoba, Olanrewaju O.; M. Gitari, Wilson; Doucet, Frederic J.; Nel, Jaco; Nyale, Sammy M.; Chuks, Paul E. (Elsevier, 2013)Natural weathering at coal power plants ash dams occurs via processes such as carbonation, dissolution, co-precipitation and fluid transport mechanisms which are responsible for the long-term chemical, physical and geochemical ... -
Desalination and seawater quality at Green Point, Cape Town: A study on the effects of marine sewage outfalls
Petrik, Leslie; Green, Lesley; Abegunde, Adeola P.; Zackon, Melissa; Sanusi, Cecilia Y.; Barnes, Jo (Academy of Science of South Africa (ASSAf), 2017)This paper presents our collection methods, laboratory protocols and findings in respect of sewage pollution affecting seawater and marine organisms in Table Bay, Cape Town, South Africa, then moves to consider ... -
Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach
Madzivire, Godfrey; Gitari, Wilson; Vadapalli, V.R. Kumar.; Ojumu, Tunde V.; Petrik, Leslie (Elsevier, 2011)The treatment of acid mine drainage (AMD) and circumneutral mine water (CMW) with South African coal fly ash (FA) provides a low cost and alternative technique for treating mine wastes waters. The sulphate concentration ... -
Fusion-assisted hydrothermal synthesis and post-synthesis modification of mesoporous hydroxy sodalite zeolite prepared from waste coal fly ash for biodiesel production
Shabani, Juvet Malonda; Ameh, Alechine E.; Petrik, Leslie (MDPI, 2022)Increases in biodiesel prices remains a challenge, mainly due to the high cost of conventional oil feedstocks used during biodiesel production and the challenges associated with using homogeneous catalysts in the process. ... -
Hall measurements on carbon nanotube paper modified with electroless deposited platinum
Petrik, Leslie; Ndungu, Patrick; Iwuoha, Emmanuel (Springer, 2010)Carbon nanotube paper, sometimes referred to as bucky paper, is a random arrangement of carbon nanotubes meshed into a single robust structure, which can be manipulated with relative ease. Multi-walled carbon nanotubes ... -
In-situ ultrasonic monitoring of zeolite A crystallization from coal fly ash
Musyoka, Nicholas; Petrik, Leslie; Hums, Eric; Baser, Hasan; Schwieger, Wilhelm (Elsevier, 2012)In this study, high phase purity of zeolite A was prepared from coal fly ash precursors. The molar regime of both the clear solution extract and unseparated fly ash slurry was adjusted to achieve the right composition for ... -
The isolation and characterization of lipid compounds from black soldier fly larvae
Okwuosa, Raissa; Mabusela, Wilfred; Missengue, Roland; Petrik, Leslie (John Wiley and Sons Inc, 2023)With the global demand for lipid compounds on the rise, concerns are growing about the environmental and economic impact of traditional lipid sources. This concern is exacerbated by the ever-increasing demand for plant-based ... -
Laboratory study on the mobility of major species in fly ash–brine co-disposal systems: up-flow percolation test
Fatoba, Ojo O.; Petrik, Leslie; Akinyeye, Richard O.; Gitari, Wilson; Iwuoha, Emmanuel I. (Springer Verlag, 2013)Apart from the generation of fly ash, brine (hyper-saline wastewater) is also a waste material generated in South African power stations as a result of water re-use. These waste materials contain major species such as Al, ... -
Novel zeolite Na-X synthesized from fly ash as a heterogeneous catalyst in biodiesel production
Babajide, Omotola; Petrik, Leslie; Musyoka, Nicholas; Ameer, Farouk (Elsevier, 2012)Several studies have been carried out on the production of biodiesel using different heterogeneous catalysts but this study has been able to demonstrate the prospect of utilizing South African class F fly ash as a raw ... -
Occurrences, levels and risk assessment studies of emergingpollutants (pharmaceuticals, perfluoroalkyl and endocrine disruptingcompounds) infish samples from Kalk Bay harbour, South Africa
Ojemaye, Cecilia. Y.; Petrik, Leslie (Elsevier, 2019)A comprehensive analysis of 15 target chemical compounds (pharmaceuticals and personal care product,perfluoroalkyl compounds and industrial chemicals) were carried out to determine their concentrationsin selected commercially ... -
Plasmonic metal decorated titanium dioxide thin films for enhanced photodegradation of organic contaminants
Nyamukamba, Pardon; Tichagwa, Lilian; Ngila, Jane Catherine; Petrik, Leslie (Elsevier, 2017)Photocatalysis using titanium dioxide as photocatalyst is an efficient way for the removal of organic contaminants in water using solar energy. In this study, thin films of copper and silver were deposited on fused ... -
Rare earths’ recovery from phosphogypsum: An overview on direct and indirect leaching techniques
Mukaba, J.-L.; Eze, C.P.; Pereao, O.; Petrik, Leslie (MDPI, 2021)The need for rare earth elements (REEs) in high-tech electrical and electronic-based materials is vital. In the global economy, deposits of natural REEs are limited except for countries such as China, which has prompted ... -
A review of combined advanced oxidation technologies for the removal of organic pollutants from water
Tijani, Jimoh O.; Fatoba, Ojo O.; Madzivire, Godfrey; Petrik, Leslie (Springer Verlag, 2014)Water pollution through natural and anthropogenic activities has become a global problem causing short-and long-term impact on human and ecosystems. Substantial quantity of individual or mixtures of organic pollutants enter ... -
A review of pharmaceuticals and endocrine-disrupting compounds: sources, effects, removal, and detections
Tijani, Jimoh O.; Fatoba, Ojo O.; Petrik, Leslie (Springer, 2013)There are growing concerns about the increasing trends of emerging micropollutants in the environment due to their potential negative impacts on natural ecosystems and humans. This has attracted attention from both ... -
Silver/carbon codoped titanium dioxide photocatalyst for improved dye degradation under visible light
Nyamukamba, Pardon; Tichagwa, Lilian; Mamphweli, S.; Petrik, Leslie (Hindawi Publishing Corporation, 2017)Herein, we report the synthesis of quartz supported TiO2 photocatalysts codoped with carbon and silver through the hydrolysis of titanium tetrachloride followed by calcination at 500°C. The prepared samples were characterized ... -
Statistical testing of input factors in the carbonation of brine impacted fly ash
Muriithi, Grace; Gitari, Wilson; Petrik, Leslie (Taylor & Francis, 2012)A D-optimal design was applied in the study of input factors: temperature, pressure, solid/liquid (S/L) ratio and particle size and their influence on the carbonation of brine impacted fly ash (FA) determined. Both ... -
Surface-modified polyacrylonitrile nanofibers as supports
Bode-Aluko, Chris Ademola; Pereao, Omoniyi; Fatoba, Olanrewaju; Petrik, Leslie (Springer Verlag, 2017)Polyacrylonitrile nanofibers (PAN-nfs) are one of the most studied nanofibres because of their excellent characteristics, such as good mechanical strength, chemical resistance, and good thermal stability. Due to the easy ...