1. Gansu Key Laboratory of Protection and Utilization for Biological Resources and Ecological Restoration, College of Chemistry and Chemical Engineering, Longdong University, Qingyang, Gansu, 745000, P. R. China
2. Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, P. R. China