Artificial photosynthesis, which mimics the natural process used by plants, offers a promising strategy for harnessing solar energy to produce valuable fuels. One intriguing approach is the photocatalyst-enzyme attached system, where a photocatalyst captures light energy and transfers it to an enzyme to drive specific chemical reactions. This study describes the synthesis of a novel photocatalyst (MWCNTCEBr) formed by coupling multiwall carbon nanotubes (MWCNTs) with a dye ethidium bromide (EBr) via a condensation reaction. The resulting photocatalyst exhibits excellent charge separation and migration abilities, leading to enhanced photocatalytic activity. Notably, MWCNTCEBr photocatalyst successfully converts α-Ketoglutarate to L-Glutamate (81.9%) and photo-regeneration of NADH (76.20%) under the influence of solar radiation. Therefore, the study demonstrates the development and the application of MWCNTCEBr photocatalyst for impressive NADH regeneration and bio-transformation.

Sun-powered synthesis: harnessing multiwall carbon nanotube-EB photocatalytic magic in a unified photocatalytic-biocatalytic system for solar- driven L-glutamate production from ɑ-ketoglutarate
    Abstract
    1 Introduction
    2 Experimental sections
        2.1 Methods and materials required
        2.2 Construction of MWCNTBr photocatalyst via coupling of MWNT and EtBr dye
        2.3 Photo-regeneration of 1,4-NADH from NAD+ co-factor
        2.4 Solar energy responsive conversion of ɑ-Ketoglutarate to L-Glutamate
    3 Results and discussion
        3.1 Characterization 
    4 Conclusion
    Acknowledgements 
    References

• Abhishek Mishra(Department of Chemistry and Environmental Science, Madan Mohan Malaviya University of Technology, Gorakhpur, U.P. 273010, India)
• Rajesh K. Yadav(Department of Chemistry and Environmental Science, Madan Mohan Malaviya University of Technology, Gorakhpur, U.P. 273010, India)
• Shaifali Mishra(Department of Chemistry and Environmental Science, Madan Mohan Malaviya University of Technology, Gorakhpur, U.P. 273010, India)
• Rehana Shahin(Department of Chemistry and Environmental Science, Madan Mohan Malaviya University of Technology, Gorakhpur, U.P. 273010, India)
• Satyam Singh(Department of Chemistry and Environmental Science, Madan Mohan Malaviya University of Technology, Gorakhpur, U.P. 273010, India)
• Abhishek Kumar Gupta(Department of Physics, Harcourt Butler Technical University, Kanpur 208002, India)
• Rajat Singhal(Centre for Sustainable Technologies, Indian Institute of Science, Bangalore Gulmohar Marg, Bengaluru 560012, India)
• Navneet K. Gupta(Centre for Sustainable Technologies, Indian Institute of Science, Bangalore Gulmohar Marg, Bengaluru 560012, India)
• Jin‑OoK Baeg(Korea Research Institute of Chemical Technology, 141 Gajeong‑Ro, Yuseong‑Gu, Daejeon, South Korea)
• Gamal A. El‑Hiti(Department of Optometry, College of Applied, Medical Sciences, King Saud University, 11433 Riyadh, Saudi Arabia)
• Krishna Kumar Yadav(Faculty of Science and Technology, Madhyanchal Professional University, Ratibad, Bhopal 462044, India, Environmental and Atmospheric Science Research Group, Scientific Research Centre, A1-Ayen University, Nasiriyah, Thi‑Qar 64001, Iraq)
• Sunita Singh(Department of Biochemistry, Shivaji College, University of Delhi, New Delhi 110027, India)