List of Titles

Authors: Muzenda, Edison , Kabuba, John , Ntuli, Freeman , Mollagee, Mansoor , Mulaba-Bafubiandi, Antoine F.
Date: 2011
Subjects: Clinoptilolite , Ion exchange , Synthetic waste water , Waste water treatment , Heavy metals - Removal
Type: Article
Identifier: uj:4708 , ISSN 2078-0966 , http://hdl.handle.net/10210/10953
Description: The objective of this study was to investigate the potential of acid activated South Africa clinoptilolite as an adsorbent in the ion-exchange process for the removal of cations from aqueous solutions. The kinetic parameters affecting the adsorption of Cu (II) ions were studied. The adsorption of Cu (II) from synthetic waste water was found to be dependent on pH, temperature, contact time and initial adsorbate concentration. The pH was varied from 2.5 to 6 and the optimum pH for Cu (II) removal was found to be 4.0. The removal of Cu (II) ions increased with time and attained saturation in about 60-70 min. The equilibrium data showed that the adsorption was endothermic nature. Kinetics data showed that at higher temperatures, the rate of adsorption is higher for the clinoptilolite natural zeolite and that Langmuir equation successfully described the adsorption process.
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Authors: Nheta, Willie , Ntuli, Freeman , Mulaba-Bafubiandi, Antoine F. , Makhatha, Elizabeth
Date: 2014
Subjects: Ion exchange , Impala Platinum Metal Refinery , Crystallised salts
Type: Article
Identifier: uj:4796 , http://hdl.handle.net/10210/12048
Description: Impala Platinum Metal Refinery (PMR) produces about 30 tonnes of salt every month after crystallisation of effluent from the refining processes. These crystallised salts contain impurities (heavy metals) and are discarded. This poses a danger to the environment and it costs the company large amount money to correctly dump them. There is need to find ways of purifying these salts and find its alternative industrial uses. Major sectors identified using industrial salt were paper mills, pharmaceutical, textile, tanning and paint industrial sectors (Department of Minerals and Energy, 2001). Comparison of the salt composition with salt specifications required for these uses revealed that the salt needed further purification in order to find application in these industrial sectors. Two approaches were proposed; treatment of the crystallized salt to remove impurities and treatment of the crystallizer influent stream before crystallization to ensure a more pure salt is produced...
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Authors: Mafu, Lihle, D.
Date: 2014-02-25
Subjects: Ion-permeable membranes , Liquid membranes , Ion exchange , Solvent extraction
Type: Thesis
Identifier: uj:4201 , http://hdl.handle.net/10210/9553
Description: M.Sc. (Chemistry) , Please refer to full text to view abstract
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Authors: Adeiga, Opeoluwa I.
Date: 2021
Subjects: Chromium , Nanocomposites (Materials) , Macadamia nut , Ion exchange , Reverse osmosis
Language: English
Type: Masters (Thesis)
Identifier: http://hdl.handle.net/10210/477186 , uj:43107
Description: Abstract: This study investigated a polyaniline decorated macadamia nutshell composite (MNS-PANI) adsorbent for the removal of highly toxic Cr(VI) and the efficient catalytic activity of the spent adsorbent for reuse. The composite adsorbent was successfully synthesised and the functional groups present were confirmed with Fourier transform infrared spectroscopy (FTIR). The diffraction patterns were examined with X-ray diffractometry (XRD) while the structure and surface morphology were assessed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The elemental composition of the adsorbent was studied using energy dispersive X-ray spectrometer (EDX) Brunauer-Emmett-Teller (BET) was used to estimate the surface area while the thermal stability was studied using thermogravimetric analyser. Batch adsorption studies were further carried out to study the adsorptive behaviour of MNS-PANI with Cr(VI), and the effects of pH, contact time, adsorbent dose, initial Cr(VI) concentration and temperature were studied. The Cr(VI) loaded MNS-PANI was further applied in the degradation of ciprofloxacin... , M.Sc. (Chemistry)
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