1. School of Materials and New Energy, Ningxia University, Yinchuan, Ningxia 750021, China
2. Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14115-175 Tehran, Iran
3. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, China