1. Department of Chemistry and Engineering, Heze University, Heze, Shandong 274015, People’s Republic of China
2. School of Materials Science
and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, People’s Republic of China
3. State Key Laboratory of Coal Conversion, Institute of
Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, People’s Republic of China