1. Department
of Applied Chemistry and the DST/Mintek Nanotechnology Innovation
Centre-Water Research Node, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028 Johannesburg, South Africa
2. Nanotechnology
and Water Sustainability Research Unit, College of Science, Engineering
and Technology, University of South Africa, Florida, 1709 Johannesburg, South Africa
3. Water
and Health Research Centre, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028 Johannesburg, South Africa
4. Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Box Wits, Johannesburg 2050, South Africa
5. Microscopy
and Microanalysis Unit, University of the Witwatersrand, P.O. Box Wits, Johannesburg 2050, South Africa