Issue 11, 2021

Advanced masking agent for leather tanning from stepwise degradation and oxidation of cellulose

Abstract

An oligosaccharide-based masking agent suitable for chrome-free metal tanning was produced from cellulose via a stepwise degradation and oxidation process. Firstly, an AlCl3-NaCl-H2O/γ-valerolactone (GVL) biphasic solvent system was established for cellulose conversion (87.6%), which allowed in situ separation of the oligosaccharides and valuable small molecules into the two phases. Then, a H2O2 oxidation process enabled further degradation of the oligosaccharides and introduced –CHO/–COOH groups. This process strengthened the surface charge of the oligosaccharides, enhancing their coordination ability with metal ions. The post-oxidized fraction, together with added Zr species, exhibited satisfactory tanning performance, with a shrinkage temperature of 85.2 °C for the tanned leather. Al/Zr species could spontaneously coordinate with O atoms of O[double bond, length as m-dash]C(2) in the carboxylic group of post-oxidized oligosaccharides, which promoted the penetration of Al/Zr species into the leather matrix for efficient crosslinking reactions.

Graphical abstract: Advanced masking agent for leather tanning from stepwise degradation and oxidation of cellulose

Supplementary files

Article information

Article type
Paper
Submitted
12 Apr 2021
Accepted
07 May 2021
First published
07 May 2021
This article is Open Access
Creative Commons BY-NC license

Green Chem., 2021,23, 4044-4050

Advanced masking agent for leather tanning from stepwise degradation and oxidation of cellulose

Z. Jiang, S. Xu, W. Ding, M. Gao, J. Fan, C. Hu, B. Shi and J. H. Clark, Green Chem., 2021, 23, 4044 DOI: 10.1039/D1GC01264A

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