1. School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China
2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan, 410083, China
3. Department of Chemistry, University of North Texas, Denton, TX, 76201, USA
4. Water Pollution Control Technology Key Lab of Hunan Province, Changsha, Hunan, 410004, China
5. College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China