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Hydrogen Production by Immobilized Rhodopseudomonas sp. Cells in Calcium Alginate Beads

Author

Listed:
  • Eleftherios Touloupakis

    (Research Institute on Terrestrial Ecosystems, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy)

  • Angeliki Chatziathanasiou

    (Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Greece)

  • Demetrios F. Ghanotakis

    (Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Greece)

  • Pietro Carlozzi

    (Research Institute on Terrestrial Ecosystems, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy)

  • Isabella Pecorini

    (DESTEC—Department of Energy, Systems, Territory and Construction Engineering, University of Pisa, 56122 Pisa, Italy)

Abstract

The present investigation concerns the potentiality of Rhodopseudomonas sp. cells to produce clean energy such as molecular hydrogen (H 2 ). The abovementioned goal could be reached by improving the capability of purple non-sulfur bacteria to produce H 2 via a photofermentative process through the enzyme nitrogenase. Rhodopseudomonas sp. cells were immobilized in calcium alginate gel beads and cultured in a cylindrical photobioreactor at a working volume of 0.22 L. The semi-continuous process, which lasted for 11 days, was interspersed with the washing of the beads with the aim of increasing the H 2 production rate. The maximum H 2 production rate reached 5.25 ± 0.93 mL/h with a total output of 505 mL. The productivity was 40.9 μL (of H 2 )/mg (of cells)/h or 10.2 mL (of H 2 )/L (of culture)/h with a light conversion efficiency of 1.20%.

Suggested Citation

  • Eleftherios Touloupakis & Angeliki Chatziathanasiou & Demetrios F. Ghanotakis & Pietro Carlozzi & Isabella Pecorini, 2022. "Hydrogen Production by Immobilized Rhodopseudomonas sp. Cells in Calcium Alginate Beads," Energies, MDPI, vol. 15(22), pages 1-11, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8355-:d:967139
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    References listed on IDEAS

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    4. Sagir, Emrah & Alipour, Siamak, 2021. "Photofermentative hydrogen production by immobilized photosynthetic bacteria: Current perspectives and challenges," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    5. Eleftherios Touloupakis & Cecilia Faraloni & Ana Margarita Silva Benavides & Giuseppe Torzillo, 2021. "Recent Achievements in Microalgal Photobiological Hydrogen Production," Energies, MDPI, vol. 14(21), pages 1-17, November.
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    Cited by:

    1. Cecilia Faraloni & Giuseppe Torzillo & Francesco Balestra & Isabela Calegari Moia & Raffaella Margherita Zampieri & Natalia Jiménez-Conejo & Eleftherios Touloupakis, 2025. "Advances and Challenges in Biohydrogen Production by Photosynthetic Microorganisms," Energies, MDPI, vol. 18(9), pages 1-25, May.

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