Biomass-derived aldehyde tanning agents with <i>in situ</i> dyeing properties: a ‘Two Birds with One Stone’ strategy for engineering chrome-free and dye-free colored leather

Ding, Wei; Remón, Javier; Jiang, Zhicheng

doi:10.1039/d2gc00705c

Cited by 25 publications

(11 citation statements)

References 41 publications

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“…In addition, the leather extract was extracted using the method described by Ding et al, 41 and its spectral data were measured using a UV spectrophotometer (Cary 5000, Agilent, America). The lightfastness performance of leather samples was determined according to the method of Shi et al 42 2.6.9 Degradability evaluation.…”

Section: Characterizationmentioning

confidence: 99%

A “three-in-one” strategy based on an on-demand multifunctional fluorescent amphoteric polymer for ecological leather manufacturing: a disruptive wet-finishing technique

Wei,

Wang,

Sun

et al. 2023

Green Chem.

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Section: Characterizationmentioning

confidence: 99%

A “three-in-one” strategy based on an on-demand multifunctional fluorescent amphoteric polymer for ecological leather manufacturing: a disruptive wet-finishing technique

Wei,

Wang,

Sun

et al. 2023

Green Chem.

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“…Sucralose, a biomass-derived aldehyde based on Schiff base crosslinking, has been effectively used as a metal-free tanning agent. The synthesized aldehyde has also been used as an in-situ dying agent but has certain limitations because of tedious reaction conditions . Other commonly used tanning systems are polyphenols and aliphatic aldehydes, which have been used in combination with conventional tanning agents to enhance the functionalities of leather.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesized aldehyde has also been used as an in-situ dying agent but has certain limitations because of tedious reaction conditions. 9 Other commonly used tanning systems are polyphenols and aliphatic aldehydes, which have been used in combination with conventional tanning agents to enhance the functionalities of leather. Several organic tannins extracted from plants have been used as organic tanning agents, including tannins extracted from Tessmannia burttii Harms.…”

Section: ■ Introductionmentioning

confidence: 99%

Insights into the Development of Imine-Bond-Stabilized Organic Tanning and a Heteropolymer for the Post-Tanning Process─A Metal-Free Sustainable Leather Process

Inbasekar

Fathima

2023

ACS Sustainable Chem. Eng.

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Organic tanning agents present a huge opportunity for developing tanning agents devoid of metals for sustainable and cleaner leather processing. An ideal tanning agent should be nontoxic, biocompatible, and cost-effective. Herein, we report an aromatic aldehyde-based modified vanillin synthesized by a singlestep substitution reaction that can be used in the tanning process. Also, multifunctional polymers with three groups (carboxyl, longchain hydrocarbon, and quaternary ammonium) are synthesized using hydroxyethyl methacrylate monomers, which can be used in the post-tanning process. The interaction of the modified vanillin derivative with collagen was studied at the molecular and fiber levels. Circular dichroism studies confirm no changes in the triplehelical conformation with increasing concentrations of modified vanillin. The crosslinking mechanism of collagen-modified vanillin by imine bond formation was confirmed through XPS. Further, the tanning input of modified vanillin was optimized, and 10% modified vanillin-tanned leather achieved 70 °C hydrothermal stability. For an integrated post-tanning process, the synthesized multifunctional polymer results in the increased uptake of dye and fatliquor. Further, the experimental leathers showed homogeneous pore size distribution, better fullness, and good mechanical strength. As expected, the pollution load of the experimental organic tanning process is significantly lesser than that of the chromium process. Thus, the present study overlays a greener metal-free leather-processing strategy.

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“…Renewable materials are potential renewable sources for chrome-free tanning agents. Biomass-derived aldehyde tanning agents can endow crust leather with similar properties to those produced with conventional chrome tanning, especially with terminal aluminum tanning treatment. − Oligosaccharides with abundant −CHO/–COOH functionalities obtained by the degradation of hemicellulose are good masking agents for aluminum and zirconium species, achieving satisfactory chrome-free tanning effects.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Starch-Based Composite Chrome-Free Tanning Agents via In Situ Catalysis Using Hydrotalcites

Shen

Fan

et al. 2023

ACS Sustainable Chem. Eng.

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The oxidation of starch into valuable chemicals holds great promise for the leather industry, but the catalytic efficiency of existing reactions is low. Moreover, residual catalyst in the reaction liquid is a potential environmental hazard. Herein, starch was oxidized by hydrogen peroxide and a magnesium aluminum iron hydrotalcite (MgAlFe-LDH) catalyst to introduce functional groups and nanomaterials, forming a starch-based hydrotalcite composite (OS-MgAlFe-LDH) in one step. This catalyst showed improved catalytic efficiency, and the generation of pollution was avoided. Moreover, the prepared OS-MgAlFe-LDH was suitable as a complex tanning agent for chrome-free tanning with improved efficiency, and MgAlFe-LDH acted as a crosslinking reinforcing agent. Using this tanning agent, the hydrothermal stability of crust leather was enhanced (shrinkage temperature: 75 °C). The tanned leather had high porosity (79.06%) and a uniform tanning agent distribution ascribed to the varying molecular weights of the components of the OS-MgAlFe-LDHs (weight-average molecular weight: 5438 g/mol). The binding energy between OS-MgAlFe-LDHs and the leather collagen (94.62 kcal/mol) was high, inhibiting the migration of OS-MgAlFe-LDHs from the collagen matrix. Thus, OS-MgAlFe-LDHs exhibited strong crosslinking performance with leather collagen. In summary, a sustainable and environmental-friendly tanning agent was prepared by a one-step synthesis in this work, offering a fundamental step for the preparation of biomass materials in the leather industry.

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Biomass-derived aldehyde tanning agents with in situ dyeing properties: a ‘Two Birds with One Stone’ strategy for engineering chrome-free and dye-free colored leather

Abstract: High-profile chrome (Cr) pollution from tanning and potential health hazards from released leather dyes and pigments in leather products restrict the sustainable development of the leather industry. Herein, we report...

Cited by 25 publications

References 41 publications

A “three-in-one” strategy based on an on-demand multifunctional fluorescent amphoteric polymer for ecological leather manufacturing: a disruptive wet-finishing technique

A “three-in-one” strategy based on an on-demand multifunctional fluorescent amphoteric polymer for ecological leather manufacturing: a disruptive wet-finishing technique

Insights into the Development of Imine-Bond-Stabilized Organic Tanning and a Heteropolymer for the Post-Tanning Process─A Metal-Free Sustainable Leather Process

One-Step Synthesis of Starch-Based Composite Chrome-Free Tanning Agents via In Situ Catalysis Using Hydrotalcites

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