1. Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan
2. Department of Materials Science & Engineering, National Chung Hsing University, Taichung 40227, Taiwan
3. Department of Environmental Engineering, National Chung Hsing University, Taichung 40227, Taiwan
4. Institute of Analytical and Environmental Sciences, National Tsing Hua University, Hsinchu 300044, Taiwan