1. College of Light Industry and Food Engineering Guangxi University Nanning 530004 P. R. China
2. Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control Nanning 530004 P. R. China
3. Department of Chemical and Biomolecular Engineering University of Tennessee Knoxville, TN USA
4. School of Electrical and Power Engineering China University of Mining and Technology Xuzhou 221116 P. R. China
5. Joint Institute for Biological Sciences Biosciences Division Oak Ridge National Laboratory Oak Ridge, TN USA
6. Center for Renewable Carbon Department of Forestry Wildlife and Fisheries University of Tennessee Knoxville, TN 37996 USA