摘要：SummaryThe efficient conversion of carbon dioxide (CO2) into useful chemicals has important practical significance for environmental protection. Until now, direct fixation of atmospheric CO2needs first extraction from the atmosphere, an energy-intensive process. Silicon (or Si-H surface), Earth-abundant, low-cost and non-toxic, is a promising material for heterogeneous CO2chemical fixation. Here we report one-step fixing of CO2directly from the atmosphere to a paraformaldehyde-like polymer by Si-H surface at room temperature. With the assistance of HF, commercial silicon powder was used as a heterogeneous reducing agent, for converting gaseous CO2to a polymer of fluorine substituted polyoxymethylene and hydroxyl substituted polyoxymethylene alternating copolymer (F-POM). Making use of the Si-H surface toward the fixation of atmospheric gaseous CO2is a conceptually distinct and commercially interesting strategy for making useful chemicals and environmental protection.Graphical AbstractDisplay OmittedHighlights•Atmospheric CO2is fixed with HF-treated silicon powders via one-step method•The product is fluorine substituted polymer (F-POM)•The fixation process is monitored byin situinfrared studies and mass spectra•The mechanism on the direct CO2fixation by Si-H surface is proposedChemistry; Surface Chemistry; Global Carbon Cycle; Energy Sustainability
