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Abstract

Sotol bagasse is an increasing waste. This is due to the growing demand for sotol liquor in Mexico. By now, it pollutes the environment with no other use. In terms of sustainable development, the safe reuse of waste and biomass is expected. Additionally, the overexploitation of aquifers and natural leaching processes have caused an increase in the concentration of arsenic in drinking water. This work aims to characterize sotol bagasse and its conversion into a biochar. Additionally, it assesses the biochar´s suitability for removing arsenic from water. Ash, extractives, and lignin content of sotol bagasse were 7.40, 11.57, and 29%. Scanning electron microscopy revealed a fibrous structure with carbon, oxygen, calcium, and potassium. Bagasse was pyrolyzed from 300 to 900 °C. Infrared spectroscopy analysis indicated biopolymer degradation according to temperature. The highest biochar yield was 46.69%. The largest surface area was 77.59 m2/g. The biochar efficiently removed arsenic (97% at eight h) from Chihuahua’s city tap water, with an initial concentration of 0.026 mg/L. X-ray photoelectron spectroscopy showed calcium within the biochar framework is essential for arsenic removal.

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Acknowledgements

This work was supported by: the National Council for Science and Technology (CONACYT project 255879), Facultad de Ciencias Químicas of the Autonomous University of Chihuahua (FCQ-UACH) and the Center of Advanced Materials Research (CIMAV).

Funding

The research leading to these results received funding from CONACYT under Grant Agreement No FORDECYT-PRONACES/2558579/2020. This work was also supported by Junta Municipal de Agua y Saneamiento, Chihuahua, Chihuahua, México. The authors have no competing interests to declare that are relevant to the content of this article.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by MRM, MEFM, GGS, VHRS, BAR, C: JN, SPV and MLB. The first draft of the manuscript was written by MRM, MEFM, and MLB and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to M. L. Ballinas-Casarrubias.

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The authors declare that they have no conflict of interest.

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Editorial responsibility: S. Mirkia.

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Supplementary file1 (DOCX 290 KB)

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Macias, M.R., Fuentes-Montero, M.E., Sánchez, G.G. et al. A new valorization of sotol bagasse waste. Int. J. Environ. Sci. Technol. (2024). https://doi.org/10.1007/s13762-024-05683-9

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  • DOI: https://doi.org/10.1007/s13762-024-05683-9

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