1. Department of Chemistry, University of Fort Hare, Private Bag X1314, Alice 5700, Eastern Cape, South Africa
2. Fort Hare Institute of Technology, University of Fort Hare, Private Bag X1314, Alice 5700, Eastern Cape, South Africa
3. Energy, Materials and Inorganic Chemistry Research Group (EMICREG), University of Fort Hare, Private Bag X1314, Alice 5700, Eastern Cape, South Africa