1. MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution Control College of Environmental Science and Engineering Nankai University Tianjin 300350 P. R. China
2. Tianjin Key Laboratory of Clean Energy and Pollutant Control School of Energy and Environmental Engineering Hebei University of Technology Tianjin 300401 P. R. China
3. Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University Tianjin 300072 P. R. China