1. College of Chemistry and Chemical Engineering
2. Xinyang Normal University
3. Xinyang 464000
4. P. R. China
5. Ministry of Education
6. Phosphorus Chemical Engineering Research Center of Henan Province
7. College of Chemistry
8. Zhengzhou University
9. Zhengzhou 450001
10. School of Chemistry and Materials Science
11. Hubei Engineering University
12. Xiaogan 432000