1. Department of Chemistry, College of Science Engineering and Technology, Science Campus, University of South Africa, Corner Christian de Wet and Pioneer Avenue Florida Park, Roodepoort, Johannesburg, Gauteng 1709, South Africa
2. Department of Chemistry, College of Natural and Computational Sciences, Debre Berhan University (DBU), Debre Berhan, Ethiopia
3. Institute for Nanotechnology and Water Sustainability (iNanoWS), The Science Campus, College of Science Engineering and Technology, Johannesburg, South Africa