Journal Pre-proof Synthesis and characterization of chitosan-pyrazoloquinoxaline Schiff bases for Cr (VI) removal from wastewater Mohammed Elhag, Huda E. Abdelwahab, Mohamed A. Mostafa, Adel Z. Nasr, Mohamed M. El Sadek PII: S0141-8130(20)34451-2 DOI: https://doi.org/10.1016/j.ijbiomac.2020.09.090 Reference: BIOMAC 16720 To appear in: International Journal of Biological Macromolecules Received date: 21 July 2020 Revised date: 12 September 2020 Accepted date: 13 September 2020 Please cite this article as: M. Elhag, H.E. Abdelwahab, M.A. Mostafa, et al., Synthesis and characterization of chitosan-pyrazoloquinoxaline Schiff bases for Cr (VI) removal from wastewater, International Journal of Biological Macromolecules (2020), https://doi.org/ 10.1016/j.ijbiomac.2020.09.090 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Published by Elsevier.