1. Assistant Professor, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
2. Research Scientist, Faculty of Technology, Univ. of Vaasa, P.O. Box 700, FI-65101 Vaasa, Finland; presently, Visiting Researcher, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China (corresponding author).
3. Researcher, Center for Environmental Monitoring of Hubei Province, Wuhan 430072, China.
4. Professor, Faculty of Resources and Environment, Hubei Univ., Wuhan 430062, China.