1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China
2. State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, PR China
3. School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410076, PR China
4. Hunan Boke Environmental Engineering Co. Ltd, Hengyang 421099, PR China