1. Department of Materials Science and Engineering, TU Delft, Mekelweg 2, 2628 CD Delft, The Netherlands
2. Department of Chemistry, KU Leuven, Celestijnenlaan 200F−P.O.
Box 2404, B-3001 Heverlee, Belgium
3. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, No. 1, Beier Street, Zhongguancun, Haidian District, Beijing 100190, P.R. China