1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan, Shanxi 030024, PR China
2. College of Textile Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, PR China
3. College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, PR China