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High Adsorption of Hazardous Cr(VI) from Water Using a Biofilter Composed of Native Pseudomonas koreensis on Alginate Beads

Author

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  • Lourdes Diaz-Jimenez

    (Sustentabilidad de los Recursos Naturales y Energía, Centro de Investigación y de Estudios Avanzados Unidad Saltillo, Ramos Arizpe 25900, Mexico)

  • Sandy Garcia-Torres

    (Sustentabilidad de los Recursos Naturales y Energía, Centro de Investigación y de Estudios Avanzados Unidad Saltillo, Ramos Arizpe 25900, Mexico)

  • Salvador Carlos-Hernandez

    (Sustentabilidad de los Recursos Naturales y Energía, Centro de Investigación y de Estudios Avanzados Unidad Saltillo, Ramos Arizpe 25900, Mexico)

Abstract

Most conventional methods to remove heavy metals from water are efficient for high concentrations, but they are expensive, produce secondary pollution, and cannot remove low concentrations. This paper proposes a biological system to remove Cr(VI) from aqueous solutions; the biofilter is composed of a native Pseudomonas koreensis immobilized in calcium alginate beads. Lab experiments were conducted in batch reactors, considering different operating conditions: Cr(VI) concentration, temperature, pH, and time. At 30 °C and a pH of 6.6, the immobilized bacteria achieved their optimal adsorption capacity. In the chromium adsorption system, saturation was reached at 30 h with a q max = 625 mg g −1 . By adjusting the experimental data to the Langmuir and Freundlich models, it is suggested that P. koreensis forms a biofilm with a homogeneous surface where Cr(VI) is adsorbed and that the bacteria also incorporates the metal in its metabolism, leading to a multilayer adsorption. On the other hand, using Fourier transform infrared spectroscopy, it was inferred that the functional groups involved in the adsorption process were O-H and C=O, which are a part of the P. koreensis cell wall.

Suggested Citation

  • Lourdes Diaz-Jimenez & Sandy Garcia-Torres & Salvador Carlos-Hernandez, 2023. "High Adsorption of Hazardous Cr(VI) from Water Using a Biofilter Composed of Native Pseudomonas koreensis on Alginate Beads," IJERPH, MDPI, vol. 20(2), pages 1-17, January.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:2:p:1385-:d:1033255
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    References listed on IDEAS

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    1. Calero, Jose & Sanchez, Yader Francisco & Torrez, Roberto & Hernann, Ena & Lopez, Kaitlin, 2008. "Elaboración y Caracterización de microcápsulas gastrorresistentes de Diclofenac obtenidas por Gelificación Iónica," Universitas (León): Revista Científica de la UNAN León, National Autonomous University of Nicaragua, Leon (Unan-Leon), Researching Center for Applied Economic (RCAE), vol. 2(1), pages 1-3, July.
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