1. College of Environmental and Chemical Engineering
2. Xi'an Polytechnic University
3. Xi'an 710048
4. PR China
5. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
6. College of Chemistry
7. Jilin University
8. Changchun 130012
9. College of Chemistry and Chemical Engineering
10. Harbin Normal University
11. Harbin
12. Key Laboratory of Polyoxometalate Science of the Ministry of Education
13. Faculty of Chemistry
14. Northeast Normal University
15. Changchun
16. P.R. China