(31g) Chloroplast-Inspired Artificial Photosynthetic Capsules for Efficient and Sustainable Enzymatic Hydrogenation
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Green Chemical Reaction Engineering for Sustainability
Sunday, October 28, 2018 - 5:30pm to 5:50pm
Inspired by the structure and function of chloroplast, an artificial photosynthetic alginate (ALG) capsule bearing carboxymethylcellulose (CMC) matric, red phosphorus quantum dots@g-C3N4 (P/CN) tubular photocatalysts and alcohol dehydrogenase (ADH) is prepared for efficient and sustainable synthesis of methanol from formaldehyde. CMC liquid core resembles grana in chloroplast to afford favorable micro-environment for stabilizing ADH, whereas P/CN photocatalysts mimic thylakoid in chloroplast to supply nicotinamide adenine dinucleotide (NADH, the hydride donor) for triggering enzymatic hydrogenation. Moreover, P/CN photocatalysts reinforce the mechanical stability and, thereby, inhibit the swelling of ALG capsules, thus suppressing the leaching of P/CN photocatalysts and enzymes. The kinetic processes of photocatalytic regeneration and enzyme hydrogenation are investigated, respectively. The optimal coupling of photo-enzyme reactions enabled by the capsules achieves the efficient and sustainable production of methanol. Our study offers some guidance for rational construction of integrated and recyclable artificial photosynthetic systems towards a broad range of chemical/biochemical reactions.