1. Beijing Engineering Research Center of Process Pollution Control; Division of Environmental Technology and Engineering; Institute of Process Engineering; Chinese Academy of Sciences; Beijing 100049 P. R. China
2. State Key Joint Laboratory of Environment Simulation and Pollution Control; School of Environment; Tsinghua University; Beijing 100084 P. R. China
3. University of Chinese Academy of Sciences; Beijing 100049 P. R. China
4. Institute of Inorganic Chemistry I; Ulm University; Ulm 89081 Germany