1. State Key Laboratory of Rare Metals Separation and Comprehensive Utilization, Guangdong Province Key Laboratory of Rare Earth Development and Application, Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou 510651, P. R. China
2. School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
3. School of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China
4. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China