1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering
2. College of Chemistry and Chemical Engineering
3. Ningxia University
4. Yinchuan 750021
5. China
6. School of Science
7. North University of China
8. Taiyuan 030051
9. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
10. College of Chemistry and Materials Science
11. Northwest University
12. Xi'an 710069