1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, China
2. College of Mechanical Engineering, Ningxia University, Yinchuan 750021, China
3. Food and Pharmaceutical Engineering College, Suihua University, Suihua 152061, China
4. The Chemical Engineering Department, Hulunbuir Vocational Technical College, Hulunbuir, Inner Mongolia 021000, China