1. Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering; Nanjing University of Science & Technology; 200 Xiaolingwei Nanjing 210094 China
2. State Key Laboratory of Coal Conversion; Institute of Coal Chemistry, Chinese Academy of Sciences; Taiyuan 030001 China
3. Department of Organic and Polymeric Materials; Tokyo Institute of Technology; 2-12-1 O-okayama Meguro-Ku Tokyo 152-8552 Japan