1. National & Local Joint Engineering Laboratory for New Petrochemical Materials and Fine Utilization of Resources, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P. R. China
2. Educational Scientific Institute, Changsha Normal University, Changsha Hunan 410100, P. R. China
3. Educational Scientific Institute, Hunan First Normal University, Changsha Hunan 410205, P. R. China