1. School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei Province 050043, China
2. Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
3. Department of Chemical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3 Canada