1. School of Environmental Science and Engineering, Chang’an University, Xi’an 710064, China
2. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Xi’an 710064, China
3. Shannxi Institute of Supervision & Testing on Product Quality, Xi’an 710054, China
4. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China