1. College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, P. R. China
2. Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, Central South University of Forestry and Technology, Changsha 410004, P. R. China
3. Bioethanol Research Center of State Forestry Bureau, Central South University of Forestry and Technology, Changsha 410004, P. R. China
4. Hunan Engineering Research Center of Woody Biomass Conversion, Central South University of Forestry and Technology, Changsha 410004, P. R. China