1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
2. Department of Chemistry, City University of Hong Kong, Kowloon 999077, Hong Kong, P. R. China
3. State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Marine Biobased Fibers and Ecological Textiles, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, P. R. China