1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming650500, PR China
2. School of Chemistry and Environment, Yunnan Minzu University, Kunming, Yunnan650504, PR China
3. College of Engineering and Physical Sciences, and School of Energy Resources, University of Wyoming, Laramie, Wyoming82071, United States
4. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming650500, PR China