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

Zhicheng Jiang; Shuguang Xu; Wei Ding; Mi  Gao; Jiajun Fan; Changwei Hu; Bi Shi; James Hanley Clark

doi:10.1039/D1GC01264A

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

Zhicheng Jiang, Shuguang Xu, Wei Ding, Mi Gao, Jiajun Fan, Changwei Hu, Bi Shi, James Hanley Clark

Chemistry

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	4044-4050
Number of pages	7
Journal	Green Chemistry
Volume	23
DOIs	https://doi.org/10.1039/D1GC01264A
Publication status	Published - 7 May 2021

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10.1039/D1GC01264ALicence: CC BY

Advanced masking agent for leather tanning from stepwise degradation and oxidation of cellulose
© The Royal Society of Chemistry 2021.
Final published version, 2.67 MBLicence: CC BY

Cite this

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title = "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.",

author = "Zhicheng Jiang and Shuguang Xu and Wei Ding and Mi Gao and Jiajun Fan and Changwei Hu and Bi Shi and Clark, {James Hanley}",

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T1 - Advanced masking agent for leather tanning from stepwise degradation and oxidation of cellulose

AU - Jiang, Zhicheng

AU - Xu, Shuguang

AU - Ding, Wei

AU - Gao, Mi

AU - Fan, Jiajun

AU - Hu, Changwei

AU - Shi, Bi

AU - Clark, James Hanley

PY - 2021/5/7

Y1 - 2021/5/7

N2 - 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.

AB - 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.

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