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Formation of silver halos by Sphingomonas paucimobilis MX8 and its bioleaching of silver from computer keyboard printed circuit boards

  • Biotechnology and Industrial Microbiology - Short Communication
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Abstract

Silver (Ag) is currently obtained from primary and secondary sources through hydrometallurgical and pyrometallurgical processes. However, these processes consume high amounts of energy and are environmentally unfriendly. The search for bacteria tolerant with a high leaching capacity for to Ag is therefore a necessary requirement as part of the development of bioleaching technologies with reduced impact on the environment and lower energy expenditure. In this sense, the objective of this research was to evaluate the tolerance of Sphingomonas paucimobilis MX8 to Ag added to nutrient agar, and to determine whether this tolerance could favor the bioleaching of Ag present on the printed circuit boards (PCBs) of computer keyboards. The bacteria Sphingomonas paucimobilis MX8 was cultured in Petri dishes with nutrient agar and four different concentrations of AgNO3 (200, 400, 600, and 800 mg L−1) at 28 °C for 10 days. For the bioleaching experiment, the bacteria were grown in a mineral medium with computer keyboard PCBs for 30 days at room temperature (17 to 22 °C) and centrifugation at 150 rpm. The results indicate that Sphingomonas paucimobilis MX8 is tolerant to Ag and forms a silvery halo around its growth in the presence of this metal. Furthermore, Sphingomonas paucimobilis MX8 was able to bioleach 12% of the Ag found in computer keyboard PCBs. The results obtained could help generate more environmentally friendly silver bioleaching processes in which the silver bioleaching capacity of this bacterium is increased.

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Acknowledgements

We thank all the students who have worked in the Microbial Biotechnology Laboratory of the Institute of Chemistry of the Universidad Veracruzana.

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Authors and Affiliations

  1. Instituto de Química Aplicada, Universidad Veracruzana, Luis Castelazo Ayala S/N, Col. Industrial Animas, 91190, Xalapa, Veracruz, México

    Rosalba Argumedo-Delira

  2. Facultad de Ciencias Agrícolas, Universidad Veracruzana, Circuito Gonzalo Aguirre Beltrán S/N, 91000, Xalapa, Veracruz, México

    Rosalba Argumedo-Delira & María Esther Díaz-Martinez

  3. Departamento de Producción y Sanidad Vegetal, Facultad de Ingeniería Agronómica, Universidad del Tolima, Barrio Santa Helena, 730001, Ibagué, Tolima, Colombia

    Mario J. Gómez Martínez

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  1. Rosalba Argumedo-Delira
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Correspondence to Rosalba Argumedo-Delira.

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Argumedo-Delira, R., Díaz-Martinez, M.E. & Martínez, M.J.G. Formation of silver halos by Sphingomonas paucimobilis MX8 and its bioleaching of silver from computer keyboard printed circuit boards. Braz J Microbiol 54, 1689–1693 (2023). https://doi.org/10.1007/s42770-023-00994-4

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  • DOI: https://doi.org/10.1007/s42770-023-00994-4

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