1. Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China
2. Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Changsha 410083, China
3. Department of Chemistry and Biochemistry, Queens College of the City University of New York, Queens, New York 11367, United States
4. Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, Michigan 49931, United States
5. Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
6. Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio 45221, United States