1. School of Metallurgy and Environment Central South University Changsha Hunan 410083 China
2. Department of Chemistry University of South Florida Tampa FL 33620 USA
3. College of Chemistry and Chemical Engineering Central South University Changsha Hunan 410083 China
4. College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou Jiangsu 215123 China
5. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Changsha Hunan 410083 China
6. Water Pollution Control Technology Key Lab of Hunan Province Changsha 410004 China
7. Department of Chemistry Collage of Science, King Saud University Riyadh 11451 Saudi Arabia
8. Department of Chemistry University of North Texas Denton TX 76201 USA