1. Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsKey Laboratory of Cluster ScienceMinistry of EducationSchool of Chemistry and Chemical EngineeringBeijing Institute of Technology Beijing 100081 P. R. China
2. Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of EducationSchool of Chemistry and Materials ScienceShanxi Normal University Linfen 041004 P. R. China
3. Engineering Research Center of Membrane and Water Treatment Technology of MOECollege of Chemical and Biological EngineeringZhejiang University Hangzhou 310027 P. R. China