1. Water Research
Center, Korea Institute of Science and Technology, Seoul 136-791,
Korea
2. Environmental Science
and Engineering, Pohang University of Science and Technology, Pohang
790-784, Korea
3. Chemistry, Smalley
Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, United States
4. Applied Chemistry, Kumoh National Institute of Technology, Gumi 730-701,
Korea
5. The Institute of
Scientific
and Industrial Research, Osaka University, Osaka 567-0047, Japan
6. Chemical
and Biological Engineering, Korea University, Seoul 136-701, Korea
7. Civil and Environmental
Engineering, Rice University, Houston, Texas 77005, United States