Distribution of Articles published per year
(1995 - 2018)
(1995 - 2018)
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Article 4 Reads 0 Citations Conversion of South African Coal Fly Ash into High-Purity ZSM-5 Zeolite without Additional Source of Silica or Alumina a... Published: 21 March 2018
Catalysts, doi: 10.3390/catal8040124
Characteristics of ZSM-5 synthesized from H2SO4-treated coal fly ash and fused coal fly ash extracts are compared in this study. In the synthesis process, fused coal fly ash extract (without an additional silica source) was used in the synthesis of ZSM-5. The effect of the structure-directing agent (tetrapropylammonium bromide, 1,6-hexanediamine or 1-propylamine) on the properties and methanol-to-olefins (MTO) effectiveness of the fly ash-based ZSM-5 was also investigated. A pure ZSM-5 synthesized from the fused coal fly ash extract led to a methanol conversion higher than 90% after 5 h on stream. The template 1,6-hexanediamine led to the synthesis of the most stable fly ash-based catalyst keeping a 44% methanol conversion after 24 h on stream.
Article 1 Read 0 Citations Visible active gold/carbon co-doped titanium dioxide photocatalytic nanoparticles for the removal of dyes in water Published: 01 March 2018
Materials Science in Semiconductor Processing, doi: 10.1016/j.mssp.2017.12.008
Gold/carbon co-doped TiO2 photocatalysts with different contents of gold were prepared using a wet chemical technique, immobilized on fused silica and tested for their photocatalytic activity using methyl orange under visible light. Co-doping significantly red shifted the absorption edge of the photocatalysts. The synergistic effects between gold and carbon were best when the Au content was 1.0% where the lowest band gap of 2.45 eV and high photocatalytic activity towards methyl orange were achieved. Co-doping was also found to promote anatase to rutile phase transformation and the highest transformation was achieved by using 0.5% of Au. The effect of the simultaneous photodegradation of methyl orange and bisphenol A was also studied and it was observed that the photodegradation rates achieved for each contaminant was reduced in the bi-component system when compared to the mono-component system.
Article 4 Reads 0 Citations Treatment of persistent organic pollutants in wastewater using hydrodynamic cavitation in synergy with advanced oxidatio... Published: 19 January 2018
Environmental Science and Pollution Research, doi: 10.1007/s11356-017-1171-z
Persistent organic pollutants (POPs) are very tenacious wastewater contaminants. The consequences of their existence have been acknowledged for negatively affecting the ecosystem with specific impact upon endocrine disruption and hormonal diseases in humans. Their recalcitrance and circumvention of nearly all the known wastewater treatment procedures are also well documented. The reported successes of POPs treatment using various advanced technologies are not without setbacks such as low degradation efficiency, generation of toxic intermediates, massive sludge production, and high energy expenditure and operational cost. However, advanced oxidation processes (AOPs) have recently recorded successes in the treatment of POPs in wastewater. AOPs are technologies which involve the generation of OH radicals for the purpose of oxidising recalcitrant organic contaminants to their inert end products. This review provides information on the existence of POPs and their effects on humans. Besides, the merits and demerits of various advanced treatment technologies as well as the synergistic efficiency of combined AOPs in the treatment of wastewater containing POPs was reported. A concise review of recently published studies on successful treatment of POPs in wastewater using hydrodynamic cavitation technology in combination with other advanced oxidation processes is presented with the highlight of direction for future research focus.
Article 3 Reads 0 Citations Corrigendum: Desalination and seawater quality at Green Point, Cape Town: A study on the effects of marine sewage outfal... Published: 14 December 2017
South African Journal of Science, doi: 10.17159/sajs.2018/a0244c
Article 2 Reads 1 Citation Desalination and seawater quality at Green Point, Cape Town: A study on the effects of marine sewage outfalls Published: 29 November 2017
South African Journal of Science, doi: 10.17159/sajs.2017/a0244
Article 1 Read 0 Citations Synthesis and Characterization of Faujasite Zeolite and Geopolymer from South African Coal Fly Ash Published: 01 September 2017
Journal of Environmental Engineering, doi: 10.1061/(ASCE)EE.1943-7870.0001212