http://hdl.handle.net/10386/2799 2026-04-02T03:44:22Z http://hdl.handle.net/10386/5110 An overview of disease and health research Vol. 3 Nozic, Darko (editor) This book covers key areas of disease and health. The contributions by the authors include functional neurological disorders, psychogenic nonepileptic seizures, psychogenic symptom, severe acute respiratory syndrome, cardiovascular disease, type-2 diabetes, pandemic’s stress, medical staff members, essential micronutrients, fortification, micronutrient stability, rice consumption profile, gastroesophageal reflux disease, proton pump inhibitors, nutrient malabsorption, Nissen fundoplication, metal ceramic restorations, anterior maxillary teeth, fixed partial denture, zirconia-based materials, autosomal recessive spastic paraplegia-51, mutations, hereditary spastic paraplegia, genetic testing, respiratory allergy, allergic rhinitis, asthma, pollen allergies, sickle cell disease, homozygous state, Arab-Indian haplotype, betaglobin gene, antenatal care, rural-urban disparities, maternal health service, health care-seeking behaviour. This book contains various materials suitable for students, researchers, and academicians in the fields of disease and health. Book 2025-01-01T00:00:00Z http://hdl.handle.net/10386/4260 Evaluation of corrosion inhibition effect of glycerol stearate on aluminium metal by electrochemical techniques Pesha, Thabo; Mulaudzi, Vusimuzi L.; Cele, Mduduzi L.; Mothapo, Mmaphefo P.; Ratshisindi, Fulufhelo The inhibitory effect of glycerol stearate (GS) on aluminium (Al) metal was examined utilizing weight loss, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) in hydrochloric acid (HCl) solution. Gravimetric analysis, PDP, and impedance spectroscopy were used to calculate the rate of corrosion (EIS). Gravimetric measurement and electrochemical methods both demonstrated that when the inhibitor concentration increased, the corrosion rate decreased. PDP and EIS inhibition effectiveness was best at 50 10-5 mol. L-1 glycerol stearate concentration,with 81.1% and 86.1%, respectively. The differences in corrosion potential (Ecorr) values between the blank and inhibitor (GS) concentrations revealed that glycerol stearate acted as a mixed type of corrosion inhibitor. The inhibitors’ adsorption on the aluminium surface followed the Langmuir isotherm model. Fourier transform infrared spectroscopy (FTIR) indicated the existence of an adsorption coating on the surface of the aluminium metal. SEM pictures of aluminium demonstrated decreased inhomogeneities in the presence of glycerol stearate. Journal article published in the Arabian Journal of Chemistry (2023) 16, 104798 2023-01-01T00:00:00Z http://hdl.handle.net/10386/4258 Design, synthesis and investigating the interaction of novel s-triazine collector with pyrite surface : a DFT-D3+U and experimental studies Mkhonto, Peace P.; Zhang, Xingrong; Lu, Liang; Xiong, Wei; Zhu, Yangge; Han, Long; Ngoepe, Phuti E. In this study the green (environmentally friendly) novel di-sodium 2,6-dithio-4-butyl-amino-1,3,5-Triazine (SDTBAT) collector also known as s-triazine molecule was designed and synthesised for use in sulphide minerals separation. The SDTBAT adsorption was investigated on pyrite mineral surface using computational density functional theory with dispersion correction and U-parameter (DFT-D3+U) as well as experimental methods. The chemical adsorption behaviour of SDTBAT collector was compared with the sodium normal butyl xanthate (SNBX) and sodium normal butyl dithiocarbamate (SNBDTC). Computationally, it was observed that the SDTBAT adsorbed through the S and N atoms, while SNBX and SBDTC adsorbed through S atoms onto pyrite Fe atoms. The adsorption energies followed the decreasing adsorption strength as: SDTBAT > SNBX > SNBDTC, which suggested that the SDTBAT had strong exothermic adsorption than xanthate and DTC. The experimental microflotation tests showed fast floating and higher recoveries of pyrite when using the SDTBAT collector compared to xanthate and DTC. The XPS and FTIR analysis of pyrite-SDTBAT revealed that the SDTBAT adsorbed through S and N atoms on Fe atoms. This clearly demonstrated that the SDTBAT was a potential collector to replace the xanthate collector due to its high flotation power for separation of sulphide minerals. Journal article published in the journal of Surfaces and Interfaces 38 (2023) 102820 2023-01-01T00:00:00Z http://hdl.handle.net/10386/4257 Comparison of adsorption capacity of water and hydroxide with collector reagents on geversite (PtSb2) mineral surface : a DFT-D insights Mangwejane, Samuel S.; Mkhonto, Peace P.; Ngoepe, Phuti E. The interactions of water, hydroxide and organic collectors with mineral surfaces are the key aspects that define the floatability behaviour of minerals. This study employed the density functional theory with dispersion correction (DFT-D) method to unravel the adsorption capacity and bonding behaviour of H2O, OH–, normalbutyl- xanthate (NBX–), butyl-dithiocarbamate (BDTC–), butyl-trithiocarbonate (BTTC–) and dibutyldithiophosphate (DBDTP–) with the PtSb2 (100) surface. The adsorption energy of hydration was found less exothermic than that of hydroxylation, indicating that the OH􀀀 had greater ability to interact with PtSb2 surface compared to H2O. The collector adsorption energies strength decreased in the order: BDTC > BTTC > NBX > DBDTP, and clearly the BDTC unveiled the superior exothermic adsorption. It was found that the collectors may easily displace water and OH􀀀 , and attach on the mineral surface during flotation due to their strong binding than water and OH􀀀 . However, since there was a greater probability of OH􀀀 attaching on the surface, operating at low pH may be decisive in the flotation of PtSb2 mineral. This study has compared the adsorption behaviour of various collectors with water and hydroxide and established the best conditions that may improve the flotation performance of PtSb2 mineral. Journal article published in the Journal of Computational Materials Science 224 (2023) 112174 2023-01-01T00:00:00Z