1. Key Laboratory of Eco-Environment-Related Polymer Materials
2. Ministry of Education of China
3. College of Chemistry and Chemical Engineering
4. Northwest Normal University
5. Lanzhou 730070
6. Department of Chemical Engineering
7. Huizhou University
8. Huizhou
9. China
10. South African Institute for Advanced Materials Chemistry
11. University of the Western Cape
12. Cape Town 7535
13. South Africa