1. School of Materials Science and Engineering
2. Lanzhou Jiaotong University
3. Lanzhou
4. P. R. China
5. College of Chemistry and Pharmaceutical Engineering
6. Hebei University of Science and Technology
7. Shijiazhuang 050018
8. Qingdao Institute of Bioenergy and Bioprocess Technology
9. Chinese Academy of Sciences
10. Qingdao 266101