1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
2. Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton E3B5A3, Canada
3. College of Foreign Language, Qingdao University of Science and Technology, Qingdao 266042, China
4. School of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266510, China