Artificial Photosynthesis Over Ultrasonically Engineered SCN@Fe3O4 Magnetic Nanorods for Selective Carboxylation Reaction

초록

One of the most difficult challenges of this century is the quick conversion of anthropogenic carbon dioxide (CO2) into value-added solar chemicals/fuels. The best method for transforming CO2 into beneficial compounds like glucose and oxygen is natural photosynthesis. In this context, herein, an artificial photosynthesis over ultrasonically engineered SCN@Fe3O4 magnetic nanorods was designed for a selective carboxylation reaction (CO2-to-formic acid production). The SCN@Fe3O4 magnetic nanorods were employed as an efficient visible light-responsive photocatalyst for the regeneration of NADH (nicotinamide adenine dinucleotide hydrogenase) from NAD+ (nicotinamide adenine dinucleotide), where NADH serves as the biologically active hydrogen carrier. Under visible light irradiation, the optimized photocatalytic system achieved an in situ NADH regeneration (74.49%), which subsequently promoted the enzymatic reduction of CO2-to-HCOOH using formate dehydrogenase (FDH). The system produced HCOOH (170.70 & micro;M) under optimized conditions in a phosphate buffer medium containing NAD+, Rh-based electron mediator, and triethanolamine (TEOA) as a sacrificial agent. The greater yield and high efficiency attained here suggest a sustainable and high-throughput approach to useful enzymatic applications.

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