Artificial Photosynthesis Over Ultrasonically Engineered SCN@Fe 3 O 4 Magnetic Nanorods for Selective Carboxylation Reaction

Vollständiger Abstract

Worum geht es in dieser Arbeit?

One of the most difficult challenges of this century is the quick conversion of anthropogenic carbon dioxide (CO 2 ) into value‐added solar chemicals/fuels. The best method for transforming CO 2 into beneficial compounds like glucose and oxygen is natural photosynthesis. In this context, herein, an artificial photosynthesis over ultrasonically engineered SCN@Fe 3 O 4 magnetic nanorods was designed for a selective carboxylation reaction (CO 2 ‐to‐formic acid production). The SCN@Fe 3 O 4 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 CO 2 ‐to‐HCOOH using formate dehydrogenase (FDH). The system produced HCOOH (170.70 µM) 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.