1. Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore Singapore
2. School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 P. R. China
3. State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210023 P. R. China
4. School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 P. R. China