1. School of Environmental Science and Engineering Tianjin University Tianjin 300350 P.R. China
2. School of Agriculture Sun Yat-Sen University Guangdong 510275 P.R. China
3. School of Environmental and Municipal Engineering Tianjin Chengjian University Tianjin 300384 P.R. China
4. School of Environment and Safety Engineering North University of China Taiyuan 030051 P.R. China
5. School of Science Tibet University Lhasa 850000 P.R. China
6. State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P.R. China
7. DICP-Surrey Joint Centre for Future Materials University of Surrey Guildford Surrey, GU2 7XH UK