1. National Engineering Laboratory for Industrial Wastewater Treatment East China University of Science and Technology Shanghai 200237 P.R China
2. Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 P.R China
3. Department of Chemistry University of Tennessee Knoxville TN 37996 USA
4. Key Laboratory for Advanced Materials Research Institute of Industrial Catalysis East China University of Science and Technology Shanghai 200237 P.R China
5. Chemical Sciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA