1. College of Textiles and Clothes, State Key Laboratory of Bio-Fibers and Eco-Textiles, College of Materials Science and Engineering, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, P. R. China
2. School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, P. R. China