1. School of Chemical Engineering, Northwest Minzu University, Lanzhou, China
2. Gansu Provincial Biomass Function Composites Engineering Research Center, Northwest Minzu University, Lanzhou, China
3. Key Laboratory of Environment-Friendly Composites of the State Ethnic Affairs Commission, Northwest Minzu University, Lanzhou, China
4. Key Laboratory for Utility of Environment-Friendly Composites and Biomass, in Universities of Gansu Province, Northwest Minzu University, Lanzhou, China