1. Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province and State Key Laboratory of Applied Organic Chemistry
2. College of Chemistry and Chemical Engineering
3. Lanzhou University
4. Lanzhou 730000
5. P. R. China
6. Xi'an Shiyou University
7. Xi'an 710065
8. College of Bioresources Chemistry and Materials Engineering
9. Shaanxi University of Science and Technology
10. Xi'an 710021
11. China