1. Research Student, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong Special Administrative Region 999077, China.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong Special Administrative Region 999077, China (corresponding author).
3. Assistant Professor, Department of Chemical and Environmental Engineering, Faculty of Engineering, Univ. of Nottingham, Nottingham NG7 2RD, U.K.
4. Engineer, Nano and Advanced Materials Institute Limited, Hong Kong Special Administrative Region 999077, China.