1. School of Science China University of Geosciences (Beijing) Beijing 100083 P. R. China
2. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology Institution of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 P. R. China
3. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences (Beijing) Beijing 100083 P. R. China