Abstract
Carbon dioxide (CO(2)) is the most significant greenhouse gas and one of the strategies to reduce CO(2) emission is to convert CO(2) into commercially valuable products. Currently, methods that can effectively capture and convert CO(2) into carbonate nanomaterials, which have unique applications in various fields, have rarely been reported, and there are no universal methods that can capture and convert CO(2) into different nano-carbonates. In this study, an innovative two-step strategy based on amino acids was developed to produce multiple different carbonate nanoparticles, including CaCO(3), BaCO(3), and Ag(2)CO(3) nanoparticles with diameters of 70 nm, 50 nm, and 7 nm, respectively. Fundamentally important, the nuclear magnetic resonance data clearly demonstrated that it was the amino acids (e.g., glycine) that dictated the formation of carbonate nanoparticles. In the presence of amino acids, a competition in forming nanoparticles and microparticles was observed, and the formation of nanoparticles was proportional to the carbamate formed from CO(2) reacting with amino acids. In the absence of amino acids, carbonate microparticles (~ 2 μm) were formed.