1. Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education Key Laboratory of Polymer Materials of Gansu Province College of Chemistry and Chemical Engineering Northwest Normal University 730070 Lanzhou Gansu P. R. China
2. Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT) Albert-Einstein-Str. 29a 18059 Rostock Germany
3. Chemical Engineering Institute Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission Northwest Minzu University 730030 Lanzhou Gansu P. R. China