1. Chemical Pollution Control Chongqing Applied Technology Extension Center of Higher Vocational Colleges, Chongqing Industry Polytechnic College, Chongqing 401120, PR China
2. College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, P. R. China
3. Institute for Structure and Function & Department of Physics, Chongqing University, Chongqing 400044, P. R. China
4. Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, 710021 Xi'an, China