1. 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, NO.967 Anning East Road, Anning District, Lanzhou, Gansu 730070, China
2. Gansu Natural Energy Research Institute, NO.20 Renmin Road, Chengguan District, Lanzhou, Gansu 730046, China