1. Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Kowloon, 999077 Hong Kong SAR
2. Centre for Environmental Engineering Research, Department of Civil Engineering and Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Pokfulam, 999077 Hong Kong SAR
3. CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
4. School of Energy and Environment, City University of Hong Kong, Kowloon, 999077 Hong Kong SAR
5. Henan Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou 450006, China
6. Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260-4200, United States