1. College of Chemistry and Chemical Engineering, State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, P. R. China
2. College of Chemistry and Chemical Engineering, Jinggangshan University, Jian 343009, P. R. China
3. College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China