1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, P. R. China
2. Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, P. R. China
3. Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, P. R. China
4. Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, P. R. China