1. Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, Doornfontein 2028, South Africa
2. Analytical Facility, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
3. Department of Science and Innovation (DSI)/National Research Foundation (NRF) South African Research Chair Initiative (SARChI): Nanotechnology for Water, University of Johannesburg, Doornfontein 2028, South Africa
4. Department of Chemistry, College of Science and Engineering and Technology, University of South Africa, Florida Science Campus, Johannesburg 1710, South Africa
5. Institute for Nanotechnology and Water Sustainability, Engineering and Technology, University of South Africa, Florida Science Campus, Johannesburg 1710, South Africa
6. Department of Chemical Sciences, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
7. Centre for Synthesis and Catalysis, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa