1. Key Laboratory of Coal Science and Technology, Ministry of Education, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, PR China
2. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
3. College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an 716000, PR China