1. School of Environmental Science & Engineering, Donghua University, 201620, Shanghai, China.
2. School of Energy and Environment Engineering, Zhongyuan University of Technology, 450007, Zhengzhou, China.
3. School of Environmental Science & Engineering, Donghua University, 201620, Shanghai, China. Phone: +86 2167792545; Fax: +86 2167792522; E-mail: Lifang@dhu.edu.cn