1. School of Material Science and Engineering; School of Chemistry and Chemical Engineering; Jiangsu University; Zhenjiang 212013 P. R. China
2. Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province; Yancheng Institute of Technology; Yancheng 224051 P. R. China
3. School of Environmental & Chemical Engineering; Jiangsu University of Science and Technology; Zhenjiang 212003 P. R. China