1. Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, P. R. China
2. Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, South China University of Technology, Guangzhou, Guangdong 510006, P. R. China
3. Jiangsu Academy of Science and Technology for Development, Nanjing, Jiangsu 210042, P. R. China
4. School of Metallurgy and Environment, Central South University, Changsha 410083, P. R. China