1. Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry a Chemical Engineering, Northwest Normal University, Lanzhou, 730070, P. R. China
2. State Key Laboratory of Aridland Crop Science, Gansu Agriculture University, Lanzhou, 730000, P. R. China