title: CO₂ sequestration through mineral carbonation of iron oxyhydroxides.
abstract: Carbon dioxide sequestration via the use of sulfide reductants and mineral carbonation of the iron oxyhydroxide polymorphs lepidocrocite, goethite, and akaganeite with supercritical CO(2) (scCO(2)) was investigated using in situ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The exposure of the different iron oxyhydroxides to aqueous sulfide in contact with scCO(2) at ∼70-100 °C resulted in the partial transformation of the minerals to siderite (FeCO(3)) and sulfide phases such as pyrite (FeS(2)). The relative yield of siderite to iron sulfide bearing mineral product was a strong function of the initial sulfide concentration. The order of mineral reactivity with regard to the amount of siderite formation in the scCO(2)/sulfide environment for a specific reaction time was goethite < lepidocrocite ≤ akaganeite. Given the presence of goethite in sedimentary formations, this conversion reaction may have relevance to the subsurface sequestration and geologic storage of carbon dioxide.
authors: Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States.
authors: Kristin
authors: K
authors: Lammers
authors: Riley
authors: R
authors: Murphy
authors: Amber
authors: A
authors: Riendeau
authors: Alexander
authors: A
authors: Smirnov
authors: Martin A A
authors: MA
authors: Schoonen
authors: Daniel R
authors: DR
authors: Strongin
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D002245:Carbon Dioxide / Q000032:analysis / Q000737:chemistry*; D057965:Carbon Sequestration; D005290:Ferric Compounds / Q000737:chemistry*; D058085:Iron Compounds / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D008903:Minerals / Q000737:chemistry; D008956:Models, Chemical; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000393:Air Pollutants; D005290:Ferric Compounds; D058085:Iron Compounds; D008903:Minerals; C473845:akaganeite; C094886:goethite; D002245:Carbon Dioxide; C000499:ferric oxide; C021024:ferric hydroxide