1. Key Laboratory of Macromolecular Science of Shaanxi Province School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 P.R. China
2. Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources Department of Chemical Engineering & Modern MaterialsShangluo University Shangluo 726000 P.R. China
3. Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education) Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Normal University Xi'an 710062 P.R. China