1. Department of Chemistry, CHRIST (Deemed to be University), Bangalore-560029, India
2. Centre for Nano and Material Sciences, Jain University, Bangalore, Karnataka 562112, India
3. Institute for Water and Wastewater Technology, Durban University of Technology, PO Box 1334, Durban-4000, South Africa
4. Department of Biomedical and Clinical Technology, Durban University of Technology, Durban-4000, South Africa