1. Technical University of Berlin, Department of Chemistry, Chemical Engineering Division, Str. des 17. Juni 124, 10623 Berlin, Germany
2. Forschungszentrum Jülich, Helmholtz Institut Erlangen-Nürnberg für Erneuerbare Energien, IEK-11, 91058 Erlangen, Germany
3. Technical University of Berlin, Department of Chemistry, Functional Materials, Hardenbergstr. 40, 10623 Berlin, Germany
4. Chemical Resource Beneficiation Faculty of Natural Sciences, North-West University, Potchefstroom 2520, South Africa