Development of aldehyde and similar-to-aldehyde tanning agents

Chen, Wenlong; Chen, Zhijun; Long, Zhongzhen; Zhi-hua, Shan

doi:10.1177/00405175211023813

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…The peak half width increase may be explained by OSA’s variable molecular mass. The very slight differences between the values of the denaturation enthalpy of the glutaraldehyde-tanned and OSA-tanned samples suggest both tannins appear to have the same type of chemical interactions with the collagen in the collagen matrix [ 71 ].…”

Section: Resultsmentioning

confidence: 99%

Cleaner Leather Tanning and Post-Tanning Processes Using Oxidized Alginate as Biodegradable Tanning Agent and Nano-Hydroxyapatite as Potential Flame Retardant

Quaratesi,

Micu,

Rebba

et al. 2023

Polymers

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In this study, sodium alginate (SA) was oxidized with potassium periodate to produce an alginate-based tanning agent. Using OSA as a biodegradable tanning agent and a nano-hydroxyapatite (nano-HAp) low concentration suspension to give flame retardancy to leather, eco-design concepts were applied to establish a chrome-, aldehyde-, and phenol-free tanning process. Micro-DSC, 1H unilateral nuclear magnetic resonance (NMR), attenuated total reflection mode Fourier transform infrared spectroscopy (FTIR-ATR), and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) were used to investigate the complex matrix collagen-OSA-nano-HAp. Micro-differential scanning calorimetry (micro-DSC) was used to assess OSA’s ability to interact with collagen and stabilize the collagen-OSA matrix, while 1H unilateral (NMR) was used to investigate the aqueous environment and its limitations around collagen molecules caused by their association with OSA and nano-HAp. Industrial standard tests were used to assess the mechanical properties and fire resistance of the new leather prototype. The findings reported here indicate that both OSA and nano-HAp are suitable alternatives for cleaner tanning technologies and more sustainable leather.

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Section: Resultsmentioning

confidence: 99%

Cleaner Leather Tanning and Post-Tanning Processes Using Oxidized Alginate as Biodegradable Tanning Agent and Nano-Hydroxyapatite as Potential Flame Retardant

Quaratesi,

Micu,

Rebba

et al. 2023

Polymers

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“…As aldehydes do not have any ionic groups, they cannot be adsorbed readily into collagen by electrostatic attraction, resulting in very poor adsorption into collagen and producing inferior performance. Moreover, aldehyde tanning agents are not only biotoxic but also they are poorly soluble in water and costly, 155 and the treated leather releases formaldehyde during use, which is a Class 3 carcinogen. 156 It was also reported that formaldehyde is released not only from aldehyde-tanned leather but also from THPS-tanned leather.…”

Section: Sustainable and Eco-friendly Chromefree Tanning Processesmentioning

confidence: 99%

A review of the green chemistry approaches to leather tanning in imparting sustainable leather manufacturing

Hassan,

Harris,

Busfield

et al. 2023

Green Chem.

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“…To keep our environment safe from pollution and to reduce health risks for workers in tannery industries, many attempts were made to avoid the application of chromium compounds in tanning https://doi.org/10.31881/TLR.2024.036 processes. Different alternative tanning materials such as vegetable tannins, oils, aldehyde tannins, zirconium tannins, aluminium tannins, titanium tannins, polymer tannins, amino acids, etc., were used in tanning operations [20][21][22]. However, these alternating tanning agents showed many limitations in tanning processes and they did not work effectively like chromium compounds thus the entire replacement of chromium with a viable alternative material was not found to be feasible in tannery industries [22].…”

Section: Introductionmentioning

confidence: 99%

A New Synthesis Method and Characterization of Graphene Oxide Nanocomposites for the Leather Tanning Process

Chakma,

Biswas,

Abdulla-Al-Mamun

et al. 2024

Text Leather Rev

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Environmental pollution caused by wastes generated from chrome tan is a major concern nowadays. This study aimed to develop an eco-friendly alternative tanning agent using graphene oxide (GO) based nanocomposite materials. GO was synthesized by a new approach with modification of the Hummers method. Two types of GO-based nanocomposites, GO-TiO2 (GT) and GO-TiO2-PEG (GTP) were prepared by adding TiO2 nanoparticles and polyethylene glycol (PEG) as surface modifiers. They were successfully applied to leather tanning processes at different concentrations (2%, 4%, and 6%). Both synthesized GO, GO-nanocomposites, and the resulting tanned leathers were characterized by Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), and Fourier-transform Infrared Spectroscopy (FT-IR). Different physico-mechanical properties of leathers tanned with nanocomposites were evaluated and the results were compared with chrome-tanned leathers. The tensile strength of chrome-tanned leather was 223 (kg/cm) whereas the maximum tensile strength was found at 228 (kg/cm) and 233 (kg/cm) in 6% GO-TiO2 and GO-TiO2-PEG tanned leathers respectively. The environmental pollution impact of the effluents generated by the new tanning process was assessed. The COD of effluents generated from chrome tanning was 4800 ppm which was significantly reduced to 2400-1440 ppm and 2880-1920 ppm when GO-TiO2 (GT) and GO-TiO2-PEG (GTP) were applied in leather tanning respectively. The TDS and BOD were found at 183.8 and 200 ppm in conventional chrome-tanned wastewater which were significantly reduced to the range of 47.5-18.3 and 100-50 ppm respectively in liquid wastes obtained from the GO-composite tanning process. The maximum reduction of COD, BOD, TDS, and TSS in leather waste liquid was found with the application of 2% GO-nanocomposites in tanning. The results revealed that leathers tanned with nanocomposites possess characteristic properties which were very similar to those observed in chrome-tanned leathers whereas the new tanning agents drastically reduced the intensity of pollutants in leather effluents. The application of new nanocomposites in the leather tanning process is an innovative effort. This new nanocomposite-tanning method showed minimal consequences regarding environmental pollution with the generation of less toxic effluents from the respective tanning process.

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Development of aldehyde and similar-to-aldehyde tanning agents

Cited by 8 publications

References 42 publications

Cleaner Leather Tanning and Post-Tanning Processes Using Oxidized Alginate as Biodegradable Tanning Agent and Nano-Hydroxyapatite as Potential Flame Retardant

Cleaner Leather Tanning and Post-Tanning Processes Using Oxidized Alginate as Biodegradable Tanning Agent and Nano-Hydroxyapatite as Potential Flame Retardant

A review of the green chemistry approaches to leather tanning in imparting sustainable leather manufacturing

A New Synthesis Method and Characterization of Graphene Oxide Nanocomposites for the Leather Tanning Process

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