1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
2. School
of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, P. R. China
3. Centre
des Matériaux des Mines d’Alès, C2MA-MPA-BCI, Ecole des mines d’Alès, avenue de Clavières, F-30319 Alès cedex, France