1. Department
of Chemistry, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho 2735, South Africa
2. Material Science Innovation & Modelling, Faculty of Agriculture, Science and Technology, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho 2735, South Africa
3. School
of Chemical Technology, Department of Biotechnology and Chemical Technology, Aalto University, P.O.
Box 16100, FIN-00076 Aalto, Finland
4. Department
of Chemistry, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa