Real-time QEXAFS spectroscopy measures rapid precipitate formation at the mineral–water interface

Matthew Siebecker (), Wei Li, Syed Khalid and Donald Sparks ()
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Matthew Siebecker: University of Delaware
Wei Li: University of Delaware
Syed Khalid: Brookhaven National Laboratory, Photon Science Directorate
Donald Sparks: University of Delaware

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Reactions at the mineral–water interface are central to numerous geochemical processes and have consequences at local, regional and global scales. They are also important in materials science research. Kinetics greatly influences mineral–water interface reactions; however, there are few kinetic data in real-time and at the molecular scale. Here we report real-time data illustrating the rapid formation of nickel aluminium-layered double hydroxide precipitates at the mineral–water interface in a flow environment in as little as 31–40 min. Layered double hydroxides have a variety of applications in environmental remediation and materials science. The real-time data shown here enhance our fundamental understanding of the kinetics of mineral–water interface processes, such as adsorption, dissolution and precipitation, by illustrating their rapid and simultaneous occurrence in a dynamic environment. Both precipitation and adsorption can occur on the same rapid timescale.

Date: 2014
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DOI: 10.1038/ncomms6003

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