1. Jiangsu Key Laboratory of Chemical Pollution Control and Resource Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing 210094 Jiangsu Province P. R. China
2. Key Laboratory of Soft Chemistry and Functional Materials Nanjing University of Science and Technology, Ministry of Education Nanjing 210094 Jiangsu Province P. R. China), Fax: (+86) 25-84315054
3. Department of Chemistry University of California, Riverside CA 92521 USA
4. Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University Suzhou 215123 Jiangsu Province P. R. China