1. M.Eng. Student, Dept. of Environmental Science and Engineering, Xi’an Jiaotong Univ., Shannxi 710049, China.
2. Professor, Dept. of Environmental Science and Engineering, Xi’an Jiaotong Univ., Shannxi 710049, China (corresponding author).
3. Engineer, Dept. of Research and Development, Shaanxi Hualu Green Environment Chemical Engineering, Shannxi 710049, China.