Abstract: A negative-carbon footprint concrete composition includes CO2-sequestering aggregate that sequesters carbon dioxide (CO2) from a CO2 containing gas and cementitious material. The negative-carbon footprint concrete composition has a negative carbon footprint relative to an ordinary concrete composition.

Abstract: Gaseous CO2 capture systems are provided. Systems of interest include a plurality of gaseous CO2 sources and at least one common CO2 capture constraining element shared by the plurality of CO2 sources. The subject systems are configured to improve at least one gaseous CO2 capture performance metric relative to a suitable control. Gaseous CO2 capture systems involving power plants, industrial plants, common mineralization capture system feed sources, common electrical grids, and common building material producers are also provided.

Abstract: Methods of producing a building material are provided. Methods of interest include preparing a carbonate precipitate comprising an undifferentiated pluripotent polymorph precursor (i.e., a polymorph precursor) and processing the carbonate precipitate under conditions sufficient to produce the building material. The disclosed polymorph precursors exist in an intermediate state between an disordered state (e.g., amorphous calcium carbonate (ACC)) and an ordered state (e.g., a polymorph of calcium carbonate or of calcium magnesium carbonate). Aspects of the invention also include building materials (e.g., aggregates) as well as compositions (e.g., concrete dry composites, settable compositions and built structures) that include building materials produced via the subject methods.

Abstract: Methods of sequestering carbon dioxide (CO2) are provided. Aspects of the methods include contacting a CO2 containing gaseous stream with an aqueous medium under conditions sufficient to produce a bicarbonate rich product. The resultant bicarbonate rich product (or a component thereof) is then combined with a cation source under conditions sufficient to produce a solid carbonate composition and product CO2 gas, followed by injection of the product CO2 gas into a subsurface geological location to sequester CO2. Also provided are systems configured for carrying out the methods.

Abstract: Methods of separating CO2 from a hydrogen synthesis product stream to produce a CO2 depleted hydrogen stream are provided. Aspects of the methods include combining the hydrogen synthesis product stream with a capture liquid and a cation source in a manner sufficient to produce a CO2 sequestering solid and separate CO2 from the hydrogen synthesis product stream to produce the CO2 depleted hydrogen stream. Also provided are systems for practicing the methods.

Abstract: A negative-carbon footprint concrete composition includes CO2-sequestering aggregate that sequesters carbon dioxide (CO2) from a CO2 containing gas and cementitious material. The negative-carbon footprint concrete composition has a negative carbon footprint relative to an ordinary concrete composition.

Abstract: Aspects of the invention include methods of removing carbon dioxide (CO2) from a CO2 containing gas. In some instances, the methods include contacting CO2 containing gas with a bicarbonate buffered aqueous medium under conditions sufficient to produce a bicarbonate rich product. Where desired, the resultant bicarbonate rich product or a component thereof may then be stored or further processed, e.g., combined with a divalent alkaline earth metal cation, under conditions sufficient to produce a solid carbonate composition. Aspects of the invention further include systems for practicing the methods, as well as products produced by the methods.

Abstract: A reduced-carbon footprint concrete composition includes CO2-sequestering aggregate that sequesters carbon dioxide (CO2) from a CO2 containing gas and cementitious material. The reduced-carbon footprint concrete composition has a reduced carbon footprint relative to an ordinary concrete composition.

Abstract: Methods of sequestering carbon dioxide (CO2) are provided. Aspects of the methods include contacting a CO2 containing gaseous stream with an aqueous medium under conditions sufficient to produce a bicarbonate rich product. The resultant bicarbonate rich product (or a component thereof) is then combined with a cation source under conditions sufficient to produce a solid carbonate composition and product CO2 gas, followed by injection of the product CO2 gas into a subsurface geological location to sequester CO2. Also provided are systems configured for carrying out the methods.

Abstract: Geomass mediated carbon dioxide (CO2) sequestering methods and systems are provided. Aspects of the methods include contacting a gaseous source of CO2 and an aqueous capture ammonia to produce a CO2 sequestering product and an aqueous ammonium salt, and then contacting the aqueous ammonium salt liquid with a geomass, e.g., alkaline waste product, to regenerate the capture ammonia. Also provided are systems configured for carrying out the methods.

Abstract: Methods of sequestering carbon dioxide (CO2) are provided. Aspects of the methods include contacting an aqueous capture ammonia with a gaseous source of CO2 under conditions sufficient to produce an aqueous ammonium carbonate. The aqueous ammonium carbonate is then combined with a cation source under conditions sufficient to produce a solid CO2 sequestering carbonate and an aqueous ammonium salt. The aqueous capture ammonia is then regenerated from the from the aqueous ammonium salt. Also provided are systems configured for carrying out the methods.

Abstract: Methods of sequestering carbon dioxide (CO2) are provided. Aspects of the methods include contacting an aqueous capture ammonia with a gaseous source of CO2 under conditions sufficient to produce an aqueous ammonium carbonate. The aqueous ammonium carbonate is then combined with a cation source under conditions sufficient to produce a solid CO2 sequestering carbonate and an aqueous ammonium salt. The aqueous capture ammonia is then regenerated from the from the aqueous ammonium salt. Also provided are systems configured for carrying out the methods.

Abstract: Geomass mediated carbon dioxide (CO2) sequestering methods and systems are provided. Aspects of the methods include contacting a gaseous source of CO2 and an aqueous capture ammonia to produce a CO2 sequestering product and an aqueous ammonium salt, and then contacting the aqueous ammonium salt liquid with a geomass, e.g., alkaline waste product, to regenerate the aqueous capture ammonia. Also provided are systems configured for carrying out the methods.

Abstract: Methods of producing solid CO2 sequestering carbonate materials are provided. Aspects of the methods include introducing a divalent cation source into a flowing aqueous liquid (e.g., a bicarbonate rich product containing liquid) under conditions sufficient such that a non-slurry solid phase CO2 sequestering carbonate material is produced. Also provided are systems configured for carrying out the methods.

Abstract: Methods of producing cured CO2 sequestering solid compositions, e.g., precipitate or aggregate compositions, are provided. Aspects of the methods include preparing an initial CO2 sequestering solid composition, and then contacting the initial composition with a curing liquid sufficient to produce a cured CO2 sequestering solid composition. Also provided are systems for performing the methods and cured CO2 sequestering solid compositions produced therefrom.

Abstract: Gaseous CO2 capture systems are provided. Systems of interest include a plurality of gaseous CO2 sources and at least one common CO2 capture constraining element shared by the plurality of CO2 sources. The subject systems are configured to improve at least one gaseous CO2 capture performance metric relative to a suitable control. Gaseous CO2 capture systems involving power plants, industrial plants, common mineralization capture system feed sources, common electrical grids, and common building material producers are also provided.

Abstract: Methods of sequestering carbon dioxide (CO2) are provided. Aspects of the methods include contacting an aqueous capture liquid, such as an aqueous capture ammonia, with a direct air capture (DAC) generated gaseous source of CO2 under conditions sufficient to produce an aqueous carbonate liquid, such as an aqueous ammonium carbonate. The aqueous carbonate liquid is then combined with a cation source under conditions sufficient to produce a solid CO2 sequestering carbonate. Also provided are systems configured for carrying out the methods.

Abstract: Methods and systems for conditioning a CO2 containing multi-component gaseous stream for use in a CO2 sequestration process are provided. Aspects of the methods include cooling the CO2 containing multi-component gaseous stream and/or removing physical components (such as, moisture, particulates, and pollutants) to condition the CO2 containing multi-component gaseous stream.

Abstract: Aspects of the invention include methods of removing carbon dioxide (CO2) from a CO2 containing gas. In some instances, the methods include contacting CO2 containing gas with a bicarbonate buffered aqueous medium under conditions sufficient to produce a bicarbonate rich product. Where desired, the resultant bicarbonate rich product or a component thereof may then be stored or further processed, e.g., combined with a divalent alkaline earth metal cation, under conditions sufficient to produce a solid carbonate composition. Aspects of the invention further include systems for practicing the methods, as well as products produced by the methods.

Abstract: Aspects of the invention include methods of removing carbon dioxide (CO2) from a CO2 containing gas. In some instances, the methods include contacting CO2 containing gas with a bicarbonate buffered aqueous medium under conditions sufficient to produce a bicarbonate rich product. Where desired, the resultant bicarbonate rich product or a component thereof may then be stored or further processed, e.g., combined with a divalent alkaline earth metal cation, under conditions sufficient to produce a solid carbonate composition. Aspects of the invention further include systems for practicing the methods, as well as products produced by the methods.