1. Key Laboratory of Eco-Environment-Related Polymer Materials; Ministry of Education of China; Gansu 703370 People's Republic of China
2. Gansu Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering; Northwest Normal University; Gansu 703370 People's Republic of China
3. College of Natural Science; Gansu Agricultural University; No. 1 Yingmen village, Anning District Lanzhou Gansu 703370 People's Republic of China