Browsing Chemistry by Issue Date

Now showing items 21-40 of 79

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 ...
Photocatalytic degradation of dyes and pesticides in the presence of ions

Pete, Kwena Yvonne (2015-03)

Water pollution caused by organic and inorganic contaminants represents an important ecological and health hazard. Simultaneous treatment of organic and inorganic contaminants had gradually gained great scientific interest. ...
Screening of substituted pyrazolone and pyrazole as ligands with palladium precursors in the Heck reaction

Bout, Wanda (2015-03)

The arylation and alkenylation of alkenes under the influence of a palladium catalyst, commonly referred to as the Heck reaction, has been extensively exploited by synthetic chemists since its debut in the late 1960’s. A ...
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 ...
Treatment of process water at Dense Media Separation (DMS) Powders Industry using selected membrane processes

Mosia, Mmankaeya Elsie (2015-07)

There is huge concern in the mining and industries to manage wastewater prior to discharge into the environment. It is generally cheaper and cost reducing for industries to treat its own wastewater before discharging to ...
The effect of solar irradiated vibrio cholerae on the immunochemistry of dendritic cells

Ssemakalu, Cano Cornelius (Vaal University of Technology, 2015-08-24)

Cholera is a waterborne disease caused by toxigenic strains of Vibrio cholerae. The spread of cholera in developing countries has largely been imputed to the unavailability of proper water treatment and sanitary infrastructure ...
X-ray spectroscopic method development for quantitative analysis of manganese ore in the Kalahari basin

Bodiba, A.L (Vaal University of Technology, 2016-11)

Manganese is a crucial element in the manufacturing of steel, which in turn is an essential material in many industries including construction and transportation. Its use in the steel making process results in increased ...
Thin film deposition of metal sulfide and metal oxide layers with and without polymer intercalation by using chemical bath deposition technique

Chiloane, M.H (Vaal University of Technology, 2017)

A well adherent single layer thin film of zinc oxide (ZnO), zinc sulfide (ZnS), cadmium oxide (CdO) and cadmium sulfide (CdS) has been deposited on silica glass substrates from basic baths containing zinc acetate, cadmium ...
Synthesis and characterization of substituted dithiocarbamates ligands and complexes as a source of metal (Pb, Ni & Co) sulphide nanoparticles

Thangwane, Selaelo Christabel (Vaal University of Technology, 2017)

Lead, nickel and cobalt dithiocarbamates complexes were synthesized using methanol and water as solvents. All complexes were refluxed at 60 °C, cooled at room temperature, washed with methanol to remove the impurities and ...
Polymer intercalation of chemically bath deposited iron sulphide and nickel sulphide thin films

Molete, Puleng Alina (Vaal University of Technology, 2017)

In chemical bath deposition (CBD) method, deposition of metal chalcogenide semiconducting thin films occurs due to substrate maintained in contact with a dilute chemical bath containing metal and chalcogenide ions. ...
Sorption of selected heavy metal ions from aqueous solutions by mango seed shell derived sorbents

Moyo, Malvin (2017-03-11)

ii Abstract The use of biosorption to complement conventional water treatment techniques has gained widespread appeal partly due to the abundance of waste materials that can be used as low cost biosorbents. However, ...
Synthesis and characterization of pine cone carbon supported iron oxide catalyst for dye and phenol degradation

Mmelesi, Olga Kelebogile (Vaal University of Technology, 2017-06)

Fenton oxidation is classified into two processes, homogeneous and heterogeneous. Homogeneous Fenton oxidation process, have been shown to be efficient in the degradation of organic pollutants. However, it was shown to ...
Synthesis, fabrication and characterization of poly nanofibers and investigation of their adsorption properties

Shooto, Ntaote David (Vaal University of Technology, 2017-06)

A major challenge for this generation is cleaning up heavy metal pollution disposed during industrial, domestic and agricultural activities. So, to obtain clean water resources, new treatment technologies are needed that ...
Synthesis and characterization of metal oxide thin films, metal sulfide and metal oxide polymer nanocomposites and studies of their application in water treatment

Xaba, Thokozani (Vaal University of Technology, 2017-08-10)

The study based on thiourea derivatives has received significant interest from several disciplines due to their variable bonding modes, promising biological implications and their complexation capacity. Thiosemicarbazones ...
Preparation, modification and characterization of activated carbon derived from Macadamia nutshells and its adsorption rate and capacity for Au(CN)2- compared to commercially prepared coconut shells

Tsolele, Refiloe (Vaal University of Technology, 2017-09)

Activated carbons have been produced from various carbonaceous source materials including nutshells, peat, wood, coir, lignite, coal and petroleum pitch and the produced carbons have been used for adsorption of inorganic ...
The effect of carboxylic acids on the size and shape of Co3O4 nanoparticles: used as capping molecules and ligands in the preparation method

Thabede, P. M. (Vaal University of Technology, 2017-09-12)

This study reports the synthesis and characterization of cobalt oxide nanoparticles using a microwave technique and chemical precipitation with oxidation method. Cobalt complexes were prepared using carboxylic acids (acetic ...
Preparation of chemically modified Macadamia nutshells for adsorptive removal of selected heavy metals

Ntuli, Themba Dominic (Vaal University of Technology, 2017-10)

The abundance of agricultural waste materials has led to its use as adsorbents for trace metal adsorption. The raw Macadamia nutshell (RMN) powder was treated with a hydrochloric acid solution to obtain acid modified ...
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 ...
Removal of selected chlorinated phenolic compounds from water sources in Vaal Triangle using HPLC, Macadamia nutshell activated carbon and solid phase extraction

Machedi, Sechaba (2017-12)

In this study, analytical method for determining the chlorinated phenols in water was developed using High Performance Liquid Chromatography. The following four compounds which are 2, 4, 6- Trichlorophenol (2, 4, 6 TCP), ...
Method development for determination and removal of the selected steroids from water sources in selected areas around the Vaal River in South Africa using High performance Liquid Chromatography, Macadamia Activated Carbon and Solid Phase Extraction

Khotha, Doctor Elias (2018)

A simple and rapid method for determination of estrone (E1) and β-estradiol (E2) was developed and validated using high performance liquid chromatography (HPLC). The solutions of standards and sample were prepared with ...