1. Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, College of Bioresource Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, P.R. China 710021
2. College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi’an, P.R. China 710021
3. School of Materials and Chemical, Engineering, Xi’an Technological University, Xi’an, P. R. China 710021