1. Department of Chemistry, University of Burgos, 09001 Burgos, Spain
2. International Research Centre in Critical Raw Materials-ICCRAM, University of Burgos, 09001 Burgos, Spain
3. Department of Physics, University of Burgos, 09001 Burgos, Spain
4. Department of Chemical and Paper Engineering, Western Michigan University, Kalamazoo, Michigan 49008-5462, United States