1. Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, P.R. China
2. Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, USA
3. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia, 010051, P.R. China