1. School of Chemistry and Chemical EngineeringJiangsu University Zhenjiang 212013 P. R. China
2. State Key Laboratory of Rare Earth Resource UtilizationInstitute of Applied ChemistryChinese Academy of Sciences Changchun 130022 P. R. China
3. School of Chemistry and Chemical EngineeringYangzhou University Yangzhou Jiangsu 225002 P. R. China
4. Institute of Physics & IMN MacroNano (ZIK)Ilmenau University of Technology Ilmenau 98693 Germany