WANG Ping1**, WANG Rong-Xia2, RAO Hong-Hua3, LIU Shan-Shan1
1. School of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China; 2. School of Humanities and Social Sciences, Beijing Institute of Petrochemical Technology, Beijing 102617, China; 3. Department of Chemistry, Capital Normal University, Beijing 100048, China