1. School of Metallurgy and Environment, Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha 410083, P. R. China
2. Department
of Civil Engineering, The University of Hong Kong, Hong Kong, P. R. China
3. National
Engineering Laboratory for Modern Silk, College of Textile and Clothing
Engineering, Soochow University, Suzhou 215123, P. R. China
4. School
of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, P. R. China