1. Faculty of Arts and Sciences/College of Education for the Future, Beijing Normal University, Zhuhai 519087, P. R. China
2. School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, P. R. China
3. College of Chemistry and Chemical Engineering, Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637000, P. R. China
4. Research and Development Center for Watershed Environmental Eco-Engineering, Beijing Normal University, Zhuhai 519087, P. R. China