1. School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
2. Nanyang Environmental & Water Research Institute (Newri), Interdisciplinary Graduate Program, Graduate School, Nanyang Technological University, Singapore 637141, Singapore
3. School of Material Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
4. School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning 116024, PR China