1. State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering; College of Chemistry and Chemical Engineering; Ningxia University; Yinchuan 750021 China
2. International Joint Research Laboratory of Nano-Micro Architecture Chemistry; Institute of Theoretical Chemistry; Jilin University; Changchun 130023 China
3. Ningxia (China-Arab) Key Laboratory of Resources Assessment of Environmental Regulation in Arid Regions; Ningxia University; Yinchuan 750021 China