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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Light-Driven C4 Biosynthesis from CO2 and H2O via Engineered Photocatalyst-Microbial Consortia.

Haiyi Xu1, Jicong Zhang1, Ke Shi2

  • 1State Key Laboratory of Quantitative Synthetic Biology, Shenzhen Key Laboratory of Materials Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.

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Summary

This study presents a novel biohybrid system for sustainable solar-driven production of succinic acid from carbon dioxide (CO2) and water. The engineered microbial consortia efficiently convert CO2 into valuable chemicals, advancing green chemistry.

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Area of Science:

  • Biotechnology
  • Photocatalysis
  • Synthetic Biology

Background:

  • Sustainable conversion of carbon dioxide (CO2) into value-added chemicals using solar energy is a significant challenge.
  • Existing methods often require sacrificial agents or lack efficiency in solar-driven synthesis.

Purpose of the Study:

  • To develop a sustainable biohybrid system for light-driven succinic acid production from CO2 and water.
  • To integrate Z-scheme photocatalysts with engineered microbial consortia for efficient carbon fixation and chemical synthesis.

Main Methods:

  • A biohybrid system combining Escherichia coli biofilms for photoelectrochemical CO2 reduction to formate and Vibrio natriegens for formate upgrading to succinic acid was constructed.
  • The system utilized Z-scheme photocatalysts and engineered microbial consortia without sacrificial agents.
  • Adaptive evolution was employed for V. natriegens to enhance formate utilization.

Main Results:

  • The biohybrid system produced 0.06 mM succinic acid in 6 hours with an apparent quantum yield of 0.154%.
  • Biofilms maintained stable contact with photocatalysts over four cycles, and V. natriegens viability increased by 11%.
  • Isotopic tracing confirmed approximately 20% carbon incorporation from CO2 into the synthesized product.

Conclusions:

  • This work establishes a sustainable platform for solar-driven multicarbon synthesis.
  • The rational integration of photocatalysis and synthetic microbial consortia offers a promising approach for CO2 valorization.
  • The developed system demonstrates efficient and sustainable production of succinic acid from CO2 using renewable energy.