1. Department of Chemistry-Chemical & Environment Engineering, Weifang University, Weifang 261061, P. R. China
2. Environmental Pollution Control Institution of Weifang University, Weifang, Shandong 261061, China
3. Shanghai Institute of Quality Inspection and Technical Research, Shanghai 200233, China
4. Weifang Water Quality Testing Co., Ltd, Weifang, Shandong 261061, China