Abstract
Tanned leather is a product of high intrinsic value and a sign of luxury. Chromium-tanned leather shavings are abundantly produced wastes which contain chromium that could be revalorized. The present research proposes the use of alkaline hydrolysis, aided by an inorganic anion, to promote the hydrolysis of the Cr–O bond. De-chromed solids were employed to synthesize carbon material, which subsequently was applied for dye removal from aqueous solution, while the chromium-rich solution was used as a re-tanning agent. The results demonstrated that it is possible to develop a method of chromium-protein separation, with a minimum degree of hydrolyzation. When an activating agent was employed, the prepared carbon had a surface area of 585 m2/g, with trace levels of chromium (< 0.1%), present mainly as Cr2O3 particles. The materials displayed an adsorption capacity of up to 47.60 mg/g and 27.58 mg/g for methylene blue and Congo red respectively. The chromium-rich solution contained proteins and amino acids that aid in its employment as a re-tanning agent. Leather that was re-tanned with this solution had a similar tear strength and a superior and tensile strength (38%), superior elongation at break (10%), and improved elongation at break (47%) than traditional Cr33-tanned leather. The present study represents a major step in the development of cleaner production of leather.
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References
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Acknowledgements
The authors are grateful with Ernesto Ornelas and Catalina de la Rosa for their technical assistance at CIATEC. The assistance of national laboratories LINAN and LANBAMA as well as the help of Ana Iris Maldonado during the microscopy measurements and Elizabeth Isaacs for the physisorption of nitrogen is appreciated. XPS analysis was performed by Engineer Wilian Javier Cauich at the National Laboratory of Nano and Biomaterials at CINVESTAV-Merida, sponsored by the following projects: FOMIX-Yucatan, 2008-1081160 and CONACYT LA-2009-01-123913, 292692, 294643, 188345, and 204822. Ionic chromatography analysis was sponsored by CONACYT through the project 269990.
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This work was supported by the Ministry for Innovation of Guanajuato (Secretaría de Innovación del Estado de Guanajuato, SICES) through the SICES/058/2018 grant and CONACYT (Ciencia de Frontera CF-2019 1727999).
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JA Arcibar-Orozco was in charge of the experimentation and planning of the manuscript, wrote the majority, and thoroughly reviewed it, A. Saldaña-Robles performed the design experimental analysis and wrote the corresponding discussion, R. Rangel-Mendez was in charge of most of the material’s characterization, Lilja Nielsen wrote part of the manuscript and edited thoroughly, H. Baltazar-Campos performed all of the extraction and adsorption experiments, A. Garduño-Cruces performed the chromatography analysis and characterization of the protein, V. Hernandez-López assisted in the experimentation related to the leather re-tanning, and F. Caballero-Briones performed the XPS analysis and discussion.
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Arcibar-Orozco, J.A., Saldaña-Robles, A., Rangel-Méndez, R. et al. Revalorization of chromium-tanned leather shavings into carbon materials and re-tanning solution. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-04014-1
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DOI: https://doi.org/10.1007/s13399-023-04014-1