1. College of Civil Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
3. Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
4. College of Environment Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China