1. School of Material Science and Engineering, University of Jinan, Jinan, 250022, P. R. China
2. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, P. R. China
3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, P. R. China
4. Pyrochar Company, Notting Hill, Victoria 3168, Australia