1. College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, PR China
2. Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan, PR China
3. State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan, PR China
4. School of Coal engineering, Shanxi Datong University, Datong, PR China
5. School of Engineering, Monash University Malaysia, Subang Jaya, Selangor, Malaysia