1. Institut Charles Gerhardt de Montpellier, UMR CNRS 5253 Université de Montpellier-CNRS-ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France
2. Cellulose and Paper Department, National Research Centre, 33 El-Behouth Street, Dokki, P.O. 12622, Giza, Egypt