1. College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, P. R. China
2. Shandong Tianming Pharmaceutical Co, Ltd., Jinan 250104, P. R. China
3. Engineering and Technology Research Center for Implant Materials of Shandong Province, Success Bio-Tech Co., Ltd., Jinan 250101, P. R. China
4. School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, P. R. China