Work

Tunable Manipulation of Mineral Carbonation Kinetics in Nanoscale Water Films via Citrate Additives

Year: 2018

Type: article

Abstract: We explored the influence of a model organic ligand on mineral carbonation in nanoscale interfacial water films by conducting five time-resolved in situ X-ray diffraction (XRD) experiments at 50 °C. Forsterite was exposed to water-saturated supercritical carbon dioxide (90 bar) that had been equilibrated with 0–0.5 m citrate (C 6 H 5 O 7 –3 ) solutions. The experimental results demonstrated that greater concentrations of citrate in the nanoscale interfacial water film promoted the precipitation of magnesite (MgCO 3 ) relative to nesquehonite (MgCO 3 ·3H 2 O). At the highest concentrations tested, magnesite nucleation and growth were inhibited, lowering the carbonation rate constant from 9.1 × 10 –6 to 3.6 × 10 –6 s –1 . These impacts of citrate were due to partial dehydration of Mg 2+ (aq) and the adsorption of citrate onto nuclei and magnesite surfaces. This type of information may be used to predict and tailor subsurface mineralization rates and pathways.

Source: Environmental Science & Technology

DOI: 10.1021/acs.est.8b00438

Authors: Quin R. S. Miller, Herbert T. Schaef, John P. Kaszuba, Lin Qiu, Mark E. Bowden, Bernard P. McGrail

Institutions: University of Wyoming, Pacific Northwest National Laboratory, Chinese Academy of Sciences, Shanghai Advanced Research Institute, Environmental Molecular Sciences Laboratory

Language: English

Topic: CO2 Sequestration and Geologic Interactions

Subfield: Environmental Engineering

Field: Environmental Science

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, University of Wyoming, School of Energy Resources, University of Wyoming, Office of Fossil Energy, Biological and Environmental Research, Pacific Northwest National Laboratory

OpenAlex ID: W2806318808

FWCI: 1.688

Cites: 120

Cited by: 51

Related to: 10