1. School of Chemistry and Environmental Engineering Wuhan Institute of Technology Wuhan 430205 P. R. China
2. Environmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 CleanTech Loop Singapore 637141 Singapore
3. Henan Institute of Advanced Technology Zhengzhou University Zhengzhou 450052 P. R. China
4. School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore