https://commons.ru.ac.za/vital/access/manager/Index en-us 5 Mechanisms and modes of β-N-methylamino-lalanine neurotoxicity: the basis for designing therapies https://commons.ru.ac.za/vital/access/manager/Repository/vital:32483 Wed 13 Mar 2024 11:50:54 SAST ]]> An exploration of HIV and aids disclosure among HIV-serodiscordant married couples in the Eastern Cape Province, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:36580 Wed 13 Mar 2024 09:30:27 SAST ]]> A strategy for sustainable ICT development in deep rural environments https://commons.ru.ac.za/vital/access/manager/Repository/vital:36483 Wed 12 May 2021 23:23:16 SAST ]]> Data quality issues in electronic health records for large-scale databases https://commons.ru.ac.za/vital/access/manager/Repository/vital:38190 Wed 12 May 2021 23:13:45 SAST ]]> β-N-Methylamino-L-Alanine is a developmental neurotoxin https://commons.ru.ac.za/vital/access/manager/Repository/vital:36949 Wed 12 May 2021 22:27:54 SAST ]]> Oral narratives as intertexts in selected Nigerian films https://commons.ru.ac.za/vital/access/manager/Repository/vital:37038 Wed 12 May 2021 22:27:35 SAST ]]> Construction material logistics management: the case of north-central Nigeria https://commons.ru.ac.za/vital/access/manager/Repository/vital:38179 Wed 12 May 2021 20:50:21 SAST ]]> Innovation: its impact on the success of construction micro, small, and medium enterprises in northern Nigeria https://commons.ru.ac.za/vital/access/manager/Repository/vital:38191 Wed 12 May 2021 20:50:17 SAST ]]> Applying anthropological perspectives in criminal procedures involving murder in Port Elizabeth, 2000-2016 https://commons.ru.ac.za/vital/access/manager/Repository/vital:38335 Wed 12 May 2021 20:07:20 SAST ]]> Antecedents and influence of the union-management relationship on employee relationships in the automotive, component and metal industries in the Nelson Mandela Bay Metropole https://commons.ru.ac.za/vital/access/manager/Repository/vital:34126 Wed 12 May 2021 19:08:39 SAST ]]> Effects of 99-year leases on newly resettled farmers’ farm improvement, productivity and empowerment in Zimbabwe, 2007 to 2013 https://commons.ru.ac.za/vital/access/manager/Repository/vital:36239 Wed 12 May 2021 18:11:36 SAST ]]> A "lean-led-evaluation" of infrastructure development improvement programme in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:38189 Wed 12 May 2021 18:05:20 SAST ]]> Microalgae as indicators of environmental change in the St Lucia estuarine system https://commons.ru.ac.za/vital/access/manager/Repository/vital:31333 Wed 12 May 2021 17:50:28 SAST ]]> Influence of laser surface treatment on residual stress distribution and dynamic properties in rotary friction welded ti-6al-4v components https://commons.ru.ac.za/vital/access/manager/Repository/vital:37050 Wed 12 May 2021 17:31:57 SAST ]]> Catholic and charismatic: identity construction in a catholic charismatic movement in Nigeria https://commons.ru.ac.za/vital/access/manager/Repository/vital:37047 Wed 12 May 2021 17:17:09 SAST ]]> A framework to measure human behaviour whilst reading https://commons.ru.ac.za/vital/access/manager/Repository/vital:36921 Wed 12 May 2021 17:12:16 SAST ]]> The synthesis and assessment of thioxanthone- and xanthone- derived compounds as hosts for application in host-guest chemistry https://commons.ru.ac.za/vital/access/manager/Repository/vital:36665 Wed 12 May 2021 17:09:11 SAST ]]> Descriptive guidelines for mediation to enhance the parental involvement of unmarried fathers https://commons.ru.ac.za/vital/access/manager/Repository/vital:30948 Wed 12 May 2021 16:47:38 SAST ]]> A sustainable industrialisation model for the ocean economy of South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:37164 Wed 12 May 2021 16:42:14 SAST ]]> The social sustainability of low-cost housing: the role of social capital and sense of place https://commons.ru.ac.za/vital/access/manager/Repository/vital:37161 Wed 12 May 2021 16:41:18 SAST ]]> In search of identity: an anthropological study on the experiences of Rastafarians in contemporary Malawi https://commons.ru.ac.za/vital/access/manager/Repository/vital:36666 Wed 12 May 2021 16:27:26 SAST ]]> Creating value through experiential marketing for mobile network operators in Ghana https://commons.ru.ac.za/vital/access/manager/Repository/vital:37158 Wed 12 May 2021 16:08:02 SAST ]]> Implementation of school-based assessment in high schools, Mpumalanga Province, South Africa : implications for teaching and learning https://commons.ru.ac.za/vital/access/manager/Repository/vital:40549 Wed 12 May 2021 15:12:07 SAST ]]> Integration of indigenous knowledge in the intermediate phase school curriculum in a selected education district in the Eastern Cape, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:40671 Wed 12 May 2021 15:03:43 SAST ]]> Pre-service education students’ application of visualisation strategies to solve mathematical word-problems https://commons.ru.ac.za/vital/access/manager/Repository/vital:40735 Wed 12 May 2021 14:58:30 SAST ]]> Selected stakeholders’ views on the use of tablet computers in learning and teaching – a South African case study at a university https://commons.ru.ac.za/vital/access/manager/Repository/vital:40553 Wed 12 May 2021 14:52:51 SAST ]]> An assessment of school food and nutrition environments for strengthening the integrated school health policy in the Eastern Cape, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:40836 Wed 12 May 2021 14:22:24 SAST ]]> Examining educators’ strategies for promoting science learning and science literacy among grade 9 learners in a South African Rural Education District https://commons.ru.ac.za/vital/access/manager/Repository/vital:40673 Wed 12 May 2021 14:05:55 SAST ]]> Caregivers’ and parents’ views about preschool education as a school readiness programme in the Queenstown Education District https://commons.ru.ac.za/vital/access/manager/Repository/vital:40674 Wed 12 May 2021 14:05:29 SAST ]]> Examining the teaching of natural sciences concepts to English second language speakers in selected primary schools in the East London Education District https://commons.ru.ac.za/vital/access/manager/Repository/vital:40564 Wed 12 May 2021 13:59:58 SAST ]]> Study habits and learning styles as correlates of grade 11 students’ academic performance in mathematical literacy in the Amathole Education District https://commons.ru.ac.za/vital/access/manager/Repository/vital:40743 Wed 12 May 2021 13:57:30 SAST ]]> Political education as a determinant of university students’ political participation in the Eastern Cape, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:40524 Wed 12 May 2021 13:55:04 SAST ]]> The influence of multinational corporations in promoting foreign direct investment in the South African business environment https://commons.ru.ac.za/vital/access/manager/Repository/vital:37131 Tue 24 May 2022 13:27:37 SAST ]]> The future of banking in South Africa towards 2055: disruptive innovation scenarios https://commons.ru.ac.za/vital/access/manager/Repository/vital:36184 Thu 14 Mar 2024 15:06:22 SAST ]]> A multi-factor model for range estimation in electric vehicles https://commons.ru.ac.za/vital/access/manager/Repository/vital:36926 Thu 13 May 2021 12:45:50 SAST ]]> Behavioural flexibility in an endangered seabird during current changes https://commons.ru.ac.za/vital/access/manager/Repository/vital:37048 Thu 13 May 2021 08:47:30 SAST ]]> Design of metal ion-selective reagents for recovery of precious metals https://commons.ru.ac.za/vital/access/manager/Repository/vital:36664 NSN2 (148.55 mg/g) > NNN1 (131.88 mg/g) > NNN2 (75.87 mg/g). The bis-benzimidazole derivatives preference for metal ions was further investigated with a multi-element solution containing Rh(III), Ir(III), Pt(II), Pd(II) and Ni(II). The bis-benzimidazole derivatives showed the following order of loading capacity: NSN1 (47.28 mg/g) > NSN2 (23.89 mg/g) > NNN1 (17.47 mg/g) > NNN2 (14.91 mg/g) for Rh(III); NSN2 (10.64 mg/g) > NNN2 (6.84 mg/g) > NSN1 (5.74 mg/g) > NNN1 (5.02 mg/g) for Ir(III); NNN2 (33.96 mg/g) > NSN1 (30.95 mg/g) > NSN2 (19.95 mg/g) > NNN1 (14.92 mg/g) for Pt(II); NNN1 (47.94 mg/g) > NNN2 (28.90 mg/g) > NSN1 (16.22 mg/g) > NSN2 (15.83 mg/g) for Pd(II). Bis-benzimidazole derivatives showed no uptake of nickel(II) under these conditions. It was observed the ligand-selectivity order for Rh(III) was similar in both single-element and multi-element studies. This order showed that the bis-benzimidazoles containing a sulfur atom showed a high preference for rhodium(III) compared to Pt(II) which had a high preference for NNN2 as well as Pd(II) which had a high preference for NNN1. Ir(III) generally had a lower preference for the ligands presumably due to its higher kinetic inertness compared with Rh(III). Column sorption of [IrCl6]2- and [RhCl5(H2O)]2- on nanofibers functionalized with diammonium cations was carried out and the loading capacities of [IrCl6]2- were obtained. [RhCl5(H2O)]2- was not adsorbed by the sorbent materials while [IrCl6]2- was loaded onto the column. The loading capacities of [IrCl6]2- with the quaternary diammonium sorbent materials increased in the order of F-QuatDMDAMeBnz (60.29 mg/g) < F-QuatDMDABnz (67.61 mg/g) < F-QuatDMDACF3Bnz (107.59 mg/g) < F-QuatDMDANO2Bnz (140.47 mg/g). The loading capacity for Ir(IV) with quaternary diammonium cationic nanofibers increased with an increase in the electron-withdrawing nature of the quaternizing group. The charge delocalizing ability of the nitrobenzyl group resulted in the best interaction of the diammonium cation with [IrCl6]2-. Batch equilibrium studies were carried out to assess the efficiency of bis-benzimidazole chelating derivatives as adsorbents using a multi-metal solution (Rh(III), Ir(III), Pt(II), Pd(II) and Ni(II)) in 0.5 M HCl. The efficiency of the quaternary diammonium cations was tested using a binary metal solution (Ir(IV) and Rh(III)) in 6 M HCl. The isothermal batch adsorption studies of a multi-metal solution with bis-benzimidazoles derivatives fitted the Langmuir isotherm model which confirmed monolayer adsorption onto a homogeneous surface. The Langmuir isotherm parameter (qe (mg/g)), using functionalized nanofibers, showed the order of NNN2 (128.21 mg/g) > NSN1 (99.01 mg/g) > NSN2 (91.74 mg/g) > NNN1 (84.03 mg/g) for Pt(II); NNN1 (66.23 mg/g) > NNN2 (5.89 mg/g) > NSN1 (1.40 mg/g) > NSN2 (0.59 mg/g) for Pd(II); NSN2 (10.64 mg/g) > NNN2 (6.84 mg/g) > NSN1 (5.74 mg/g) > NNN1 (5.02 mg/g) for Ir(III); NSN1 (140.85 mg/g) > NSN2 (109.89 mg/g) > NNN1 (104.17 mg/g) > NNN2 (91.74 mg/g) for Rh(III). The pseudo-first-order kinetics model was found to be the best fit to describe the adsorption kinetics of all metal ions onto all the sorbent materials. K1 (min-1) value in pseudo-first-order kinetics showed the same order of adsorption as observed in the Langmuir isotherms. The isothermal batch adsorption studies of [IrCl6]2- and [RhCl5(H2O)]2- with quaternary diammonium cations fitted the Freundlich isotherm model and confirmed to be effective for multiple-layered adsorption onto a heterogeneous surface. The Freundlich isotherm parameter (kf (mg/g)) using functionalized quaternary diammonium cationic nanofibers increased in the order of F-QuatDMDANO2Bnz (794.33 mg/g) > F-QuatDMDACF3Bnz (185.35 mg/g) > F-QuatDMDABnz (156.32 mg/g) > F-QuatDMDAMeBnz (112.46 mg/g) for Ir(IV) uptake. F-QuatDMDANO2Bnz resin showed the highest adsorption than that of F-QuatDMDAMeBnz, F-QuatDMDABnz and F-QuatDMDACF3Bnz and this order is similar to what was observed in column studies. The quaternary diammonium cations were shown to have the highest adsorption capacity for Ir(IV) compared with Rh(III). The adsorption of Rh(III) was also observed to increase in the order of F-QuatDMDANO2Bnz (177.83 mg/g) > F-QuatDMDACF3Bnz (40.37 mg/g) > F-QuatDMDABnz (36.98 mg/g) > F-QuatDMDAMeBnz (12.71 mg/g). The pseudo-second-order kinetic model was found to be the best fit to describe the adsorption kinetics of both metal ions onto all the sorbent materials. K2 (g.mg-1min-1) value in pseudo-second-order kinetics showed the same order of adsorption as observed in the Freundlich isotherms. The adsorption studies showed adsorption takes place via chemisorption process. This thesis presents PGMs and iridium-specific materials that could be applied in solutions of secondary PGMs sources containing rhodium, platinum and palladium with bis-benzimidazoles as well as in feed solutions from ore processing with diammonium cations for iridium recovery.]]> Thu 13 May 2021 07:20:28 SAST ]]> HIV-related stigma in rural areas: a case of citrus farm workers based in Addo community in Eastern Cape https://commons.ru.ac.za/vital/access/manager/Repository/vital:36501 Thu 13 May 2021 07:19:19 SAST ]]> Development of spunlaced nonwoven filters from PAN, PPS and PI fibres for industrial use https://commons.ru.ac.za/vital/access/manager/Repository/vital:32266 Thu 13 May 2021 06:46:04 SAST ]]> A leadership development model to enhance ethical governance in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:35489 Thu 13 May 2021 05:55:43 SAST ]]> Optimising construction project role-player performance https://commons.ru.ac.za/vital/access/manager/Repository/vital:36140 Thu 13 May 2021 05:47:12 SAST ]]> Attachment styles, coping strategies, personal meaning, and mental health in nonclinical adults https://commons.ru.ac.za/vital/access/manager/Repository/vital:30950 Thu 13 May 2021 05:44:48 SAST ]]> An investigation of plant conservation strategies employed in Makhanda, South Africa: an educational exploration https://commons.ru.ac.za/vital/access/manager/Repository/vital:34276 Thu 13 May 2021 05:07:10 SAST ]]> Culturally-informed coping strategies of posttraumatic stress disorders among the black Africans in the greater Accra region of Ghana and black Africans in the eastern cape of South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:38259 Thu 13 May 2021 04:33:34 SAST ]]> Conflict transformation and campus protests at Rhodes University, 2015 - 2016 https://commons.ru.ac.za/vital/access/manager/Repository/vital:35756 Thu 13 May 2021 04:25:22 SAST ]]> A model for using learners' online behaviour to inform differentiated instructional design in MOODLE https://commons.ru.ac.za/vital/access/manager/Repository/vital:36155 Thu 13 May 2021 02:25:13 SAST ]]> The impact of public spending on economic growth, employment and poverty reduction in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:35570 Thu 13 May 2021 02:07:00 SAST ]]> A framework for ethical sourcing of construction materials https://commons.ru.ac.za/vital/access/manager/Repository/vital:36629 Thu 13 May 2021 01:56:47 SAST ]]> A change framework for introducing performance management in higher education: a case study https://commons.ru.ac.za/vital/access/manager/Repository/vital:36590 Thu 13 May 2021 01:43:19 SAST ]]> An evaluation of a profiling and selection process for apprentices in the South African automotive industry https://commons.ru.ac.za/vital/access/manager/Repository/vital:36791 Thu 13 May 2021 01:32:02 SAST ]]> Microstructural evolution of welded creep aged 12% cr martensitic stainless steel https://commons.ru.ac.za/vital/access/manager/Repository/vital:31128 Thu 13 May 2021 01:09:19 SAST ]]> Management capacity within small and medium tourism enterprises (SMTEs) https://commons.ru.ac.za/vital/access/manager/Repository/vital:36574 Thu 13 May 2021 00:50:46 SAST ]]> Anthropological study on perceptions of gender inequality in soccer: the case of selected Tsakane township schools https://commons.ru.ac.za/vital/access/manager/Repository/vital:38260 Thu 13 May 2021 00:38:50 SAST ]]> Sustainable rural development through community participation: modeling community-based tourism in Nqileni village, Eastern Cape, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:36863 Thu 13 May 2021 00:04:38 SAST ]]> A co-constructed practice model for supporting parents of children in conflict with the law https://commons.ru.ac.za/vital/access/manager/Repository/vital:30949 Fri 15 Mar 2024 13:00:57 SAST ]]> The anti-proliferative activity of drimia altissima and a novel isolated flavonoid glycoside against hela cervical cancer cells https://commons.ru.ac.za/vital/access/manager/Repository/vital:36690 Fri 15 Mar 2024 12:32:30 SAST ]]>