1. Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China Ministry of Education, School of Chemical Engineering, Southwest Forestry University, Kunming 650224, P. R. China
2. Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
3. Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, P. R. China
4. Department of Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK