Development of Palladium selective reagents and materials
- Authors: Moyo, Cyprian Bertrand
- Date: 2016
- Subjects: Palladium Palladium compounds -- Industrial applications Chemistry, Inorganic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/12231 , vital:27046
- Description: The adsorption and separation of Pd(II) from Pt(IV), Ir(IV) and Rh(III) by silica microparticles functionalized with triethylenetetramine (TETA), 2-(2-aminoethylthio)ethanamine (NSN) and 2-(2-(2-aminoethyl)ethylthio)ethanamine (NSSN) in 1 M hydrochloric acid medium was investigated by continuous column studies. The functionalized sorbent materials were characterized by microanalysis, SEM-EDS and FT-IR. Palladium selectivity of the sorbent materials was achieved by stripping of rhodium, iridium and platinum chlorido species with 0.5 M of NaClO4 in 1 M HCl while [PdCl4]2 was eluted with 3% w/v thiourea. The desorption efficiency of thiourea was confirmed by the SEM-EDS analysis of the materials after Pd(II) elution. Palladium loading capacity of the sorbents were in the order S-NSSN (23.85 mg/g) > S-NSN (12.70 mg/g) > S-TETA (4.97 mg/g). The extraction patterns on the sorbent materials were explained by considering the coordination chemistry of the ligand with [PdCl4]2ˉ and ionic interactions of [PtCl6]2ˉ and [IrCl5(H2O]ˉ. The square planar complexes, [Pd(HNSSNH)Cl2]Cl2 and [Pd(NSNH)Cl2][PdCl4]2, were isolated, analyzed by spectroscopy and single crystal X-ray, whereas evidence of the fraction of Pd(II)-TETA complex was obtained by HPLC studies. This provided proof of the inner sphere coordination mechanism as the mode of interaction of these ligands with [PdCl4]2ˉ. Trace amounts of Brˉ anions in ligands resulted in the inadvertent isolation of bromide coordinated Pd(II) NSN and NSSN complexes. The ion-pair salts of [TETAH4]4+ with [PtCl6]2ˉ, [IrCl6]3ˉ and [RhCl6]3ˉ were also isolated and characterized by microanalysis and IR to further explain the extraction patterns.
- Full Text:
- Date Issued: 2016
- Authors: Moyo, Cyprian Bertrand
- Date: 2016
- Subjects: Palladium Palladium compounds -- Industrial applications Chemistry, Inorganic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/12231 , vital:27046
- Description: The adsorption and separation of Pd(II) from Pt(IV), Ir(IV) and Rh(III) by silica microparticles functionalized with triethylenetetramine (TETA), 2-(2-aminoethylthio)ethanamine (NSN) and 2-(2-(2-aminoethyl)ethylthio)ethanamine (NSSN) in 1 M hydrochloric acid medium was investigated by continuous column studies. The functionalized sorbent materials were characterized by microanalysis, SEM-EDS and FT-IR. Palladium selectivity of the sorbent materials was achieved by stripping of rhodium, iridium and platinum chlorido species with 0.5 M of NaClO4 in 1 M HCl while [PdCl4]2 was eluted with 3% w/v thiourea. The desorption efficiency of thiourea was confirmed by the SEM-EDS analysis of the materials after Pd(II) elution. Palladium loading capacity of the sorbents were in the order S-NSSN (23.85 mg/g) > S-NSN (12.70 mg/g) > S-TETA (4.97 mg/g). The extraction patterns on the sorbent materials were explained by considering the coordination chemistry of the ligand with [PdCl4]2ˉ and ionic interactions of [PtCl6]2ˉ and [IrCl5(H2O]ˉ. The square planar complexes, [Pd(HNSSNH)Cl2]Cl2 and [Pd(NSNH)Cl2][PdCl4]2, were isolated, analyzed by spectroscopy and single crystal X-ray, whereas evidence of the fraction of Pd(II)-TETA complex was obtained by HPLC studies. This provided proof of the inner sphere coordination mechanism as the mode of interaction of these ligands with [PdCl4]2ˉ. Trace amounts of Brˉ anions in ligands resulted in the inadvertent isolation of bromide coordinated Pd(II) NSN and NSSN complexes. The ion-pair salts of [TETAH4]4+ with [PtCl6]2ˉ, [IrCl6]3ˉ and [RhCl6]3ˉ were also isolated and characterized by microanalysis and IR to further explain the extraction patterns.
- Full Text:
- Date Issued: 2016
Investigating the high level of consumer indebtedness in the South African retail market
- Authors: Kgomo, Stephen Phuti
- Date: 2016
- Subjects: Consumer credit -- South Africa , Debt -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/8450 , vital:26360
- Description: This study was aimed at investigating the high level of consumer indebtedness in the South African retail market more specifically factors that contribute to consumer indebtedness. Recommendations on how to control the level of consumer indebtedness are also presented. Consumer indebtedness is a problem in many countries around the world and as witnessed during the 2008 global financial crisis, its impact can be disastrous. Not only does it create problems for the families but also for a country and even to the extent of the whole world. The literature conducted did not reveal a study undertaken to investigate factors that impact consumer indebtedness. Eight factors were identified and explored further in this study. Results were analysed in chapter three and outcomes presented in chapter four. The method used in conducting this study is the quantitative method. A questionnaire was developed based on the literature review conducted. The questionnaire was a five point Likert scale and was distributed to the respondents in the southern area of Tshwane Municipal district. In view of a manageable number of responses, results were analysed using an excel spreadsheet. Results were verified by an independent expert. From the eight factors that are identified, one (easy access to credit) was found to impact the high level of consumer indebtedness. Although there are other weaknesses, easy access to credit is found to be the main contributor. Recommendations on the findings are presented in chapter five of this study.
- Full Text:
- Date Issued: 2016
- Authors: Kgomo, Stephen Phuti
- Date: 2016
- Subjects: Consumer credit -- South Africa , Debt -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/8450 , vital:26360
- Description: This study was aimed at investigating the high level of consumer indebtedness in the South African retail market more specifically factors that contribute to consumer indebtedness. Recommendations on how to control the level of consumer indebtedness are also presented. Consumer indebtedness is a problem in many countries around the world and as witnessed during the 2008 global financial crisis, its impact can be disastrous. Not only does it create problems for the families but also for a country and even to the extent of the whole world. The literature conducted did not reveal a study undertaken to investigate factors that impact consumer indebtedness. Eight factors were identified and explored further in this study. Results were analysed in chapter three and outcomes presented in chapter four. The method used in conducting this study is the quantitative method. A questionnaire was developed based on the literature review conducted. The questionnaire was a five point Likert scale and was distributed to the respondents in the southern area of Tshwane Municipal district. In view of a manageable number of responses, results were analysed using an excel spreadsheet. Results were verified by an independent expert. From the eight factors that are identified, one (easy access to credit) was found to impact the high level of consumer indebtedness. Although there are other weaknesses, easy access to credit is found to be the main contributor. Recommendations on the findings are presented in chapter five of this study.
- Full Text:
- Date Issued: 2016
A study of a 2010 strike in a sub-directorate of the Nelson Mandela Bay Municipality
- Authors: Kigozi, Annet Nakimuli
- Date: 2012
- Subjects: Strikes and lockouts -- Municipal government -- South Africa -- Nelson Mandela Bay Municipality , Industrial relations -- South Africa -- Nelson Mandela Bay Municipality , Labor unions -- South Africa -- Nelson Mandela Bay Municipality
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9421 , http://hdl.handle.net/10948/d1021229
- Description: This research adds on to Chaulk & Brown (2008) research on the assessment of employees’ reaction towards management and the union in the pre-strike and post-strike period. Research problem: The study raised two aspects that form part of the statement of the problem. Firstly, strike action has been a major aspect describing the South African industrial relations climate. The high level of strike action prompts the question; “Are South Africans World Class Strikers?” (Anstey, 2006). Secondly, the analysis of strike action has focussed more on the economic and power testing impact analysis rather than psychological and affective impact analysis of the strike such as establishing the impact of the strike on job satisfaction, work climate satisfaction, organisational commitment, management satisfaction, and union commitment. Research objectives: To address the research problem, research objectives, research questions and hypotheses were established. The main objective of the study was to examine the causes, processes and the impact of the strike, thereby making a contribution to both theory and practice. Whereas the contribution to theory took a form of building on to the research carried out by Chaulk & Brown (2008), and exploring through the process analysis on how behaviour during the conflict impacts on the ongoing relationships within the organisation, the contribution to practice took a form of highlighting to management and unions the impact of the strike on employees so that necessary interventions to prevent the negative impact of the strike would be created. Research questions: Six research questions were established and these were; what were the causes of the strike; how did the strike unfold; what were the substantive outcomes of the strike; what were the procedural outcomes of the strike; what were the climate outcomes of the strike; is there a relationship between the demographic factors and the affective outcomes of the strike? Research hypotheses; Five research hypotheses were established for the research. These hypotheses were aimed at establishing the impact of the strike on the affective outcomes of the strike. These were; there was a significant change in the level of organizational commitment after the strike; there was a significant change in the level of job satisfaction after the strike; there was a significant change in the level of work climate satisfaction after the strike; there was a significant change in the level of management satisfaction after the strike; and there is was significant change in the level of union commitment after the strike. Research design and methodology: Both qualitative and quantitative methods were used to collect data. Qualitatively, interviews, media reports and the Municipality records were being used to collect data on the causes, processes and outcomes of the strike. Quantitatively a survey questionnaire was used to collect data. Data was collected from 105 Traffic Officers who had recently been on strike in the NMBM. Measures of organisational and union commitment, employee job satisfaction, and work climate satisfaction were assessed using the Chaulk & Brown (2008) questionnaire. A paired sample t-test, ANOVA test, and Scheffe test and Cronbach’s alpha, were some of the quantitative methods used in data analysis. Henning’s approach was used to analyze qualitative data. Major findings: The results from the questionnaire revealed that job satisfaction, work climate satisfaction and management satisfaction significantly changed in the post-strike period. In addition, impact of demographic factors on affective factors was evident for participation in the strike and the level of union commitment; age and job satisfaction; occupational level and job satisfaction; and service length and union commitment.
- Full Text:
- Date Issued: 2012
- Authors: Kigozi, Annet Nakimuli
- Date: 2012
- Subjects: Strikes and lockouts -- Municipal government -- South Africa -- Nelson Mandela Bay Municipality , Industrial relations -- South Africa -- Nelson Mandela Bay Municipality , Labor unions -- South Africa -- Nelson Mandela Bay Municipality
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9421 , http://hdl.handle.net/10948/d1021229
- Description: This research adds on to Chaulk & Brown (2008) research on the assessment of employees’ reaction towards management and the union in the pre-strike and post-strike period. Research problem: The study raised two aspects that form part of the statement of the problem. Firstly, strike action has been a major aspect describing the South African industrial relations climate. The high level of strike action prompts the question; “Are South Africans World Class Strikers?” (Anstey, 2006). Secondly, the analysis of strike action has focussed more on the economic and power testing impact analysis rather than psychological and affective impact analysis of the strike such as establishing the impact of the strike on job satisfaction, work climate satisfaction, organisational commitment, management satisfaction, and union commitment. Research objectives: To address the research problem, research objectives, research questions and hypotheses were established. The main objective of the study was to examine the causes, processes and the impact of the strike, thereby making a contribution to both theory and practice. Whereas the contribution to theory took a form of building on to the research carried out by Chaulk & Brown (2008), and exploring through the process analysis on how behaviour during the conflict impacts on the ongoing relationships within the organisation, the contribution to practice took a form of highlighting to management and unions the impact of the strike on employees so that necessary interventions to prevent the negative impact of the strike would be created. Research questions: Six research questions were established and these were; what were the causes of the strike; how did the strike unfold; what were the substantive outcomes of the strike; what were the procedural outcomes of the strike; what were the climate outcomes of the strike; is there a relationship between the demographic factors and the affective outcomes of the strike? Research hypotheses; Five research hypotheses were established for the research. These hypotheses were aimed at establishing the impact of the strike on the affective outcomes of the strike. These were; there was a significant change in the level of organizational commitment after the strike; there was a significant change in the level of job satisfaction after the strike; there was a significant change in the level of work climate satisfaction after the strike; there was a significant change in the level of management satisfaction after the strike; and there is was significant change in the level of union commitment after the strike. Research design and methodology: Both qualitative and quantitative methods were used to collect data. Qualitatively, interviews, media reports and the Municipality records were being used to collect data on the causes, processes and outcomes of the strike. Quantitatively a survey questionnaire was used to collect data. Data was collected from 105 Traffic Officers who had recently been on strike in the NMBM. Measures of organisational and union commitment, employee job satisfaction, and work climate satisfaction were assessed using the Chaulk & Brown (2008) questionnaire. A paired sample t-test, ANOVA test, and Scheffe test and Cronbach’s alpha, were some of the quantitative methods used in data analysis. Henning’s approach was used to analyze qualitative data. Major findings: The results from the questionnaire revealed that job satisfaction, work climate satisfaction and management satisfaction significantly changed in the post-strike period. In addition, impact of demographic factors on affective factors was evident for participation in the strike and the level of union commitment; age and job satisfaction; occupational level and job satisfaction; and service length and union commitment.
- Full Text:
- Date Issued: 2012
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