1. College of Chemistry and Chemical Engineering, Hubei Polytechnic University, Huangshi, Hubei 435003, P.R. China
2. Pharmaceutical College, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
3. College of Materials Science and Engineering, Hubei Polytechnic University, Huangshi, Hubei 435003, P.R. China