1. China Leather and Footwear Research Institute Co. Ltd., Beijing 100015, P. R. China
2. Key Laboratory of Leather and Footwear Green Manufacturing Technology of China Light Industry, Beijing 100015, P. R. China
3. Instituto de Carboquímica, CSIC, Zaragoza, 50018, Spain
4. National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu, 610065, P. R. China