Ab Initio Determination of Edge Surface Structures for Dioctahedral 2:1 Phyllosilicates: Implications for Acid-Base Reactivity

Cambridge University Press (CUP) - 2003
Barry R. Bickmore1, Kevin M. Rosso2, Kathryn L. Nagy3, Randall T. Cygan4, Christopher J. Tadanier5
1Department of Geology, Brigham Young University, Provo, USA
2Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, USA
3Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, USA
4Geochemistry Department, Sandia National Laboratories, Albuquerque, USA
5Department of Geological Sciences and Charles E. Via Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, USA

Tóm tắt

AbstractThe atomic structure of dioctahedral 2:1 phyllosilicate edge surfaces was calculated using pseudopotential planewave density functional theory. Bulk structures of pyrophyllite and ferripyrophyllite were optimized using periodic boundary conditions, after which crystal chemical methods were used to obtain initial terminations for ideal (110)- and (010)-type edge surfaces. The edge surfaces were protonated using various schemes to neutralize the surface charge, and total minimized energies were compared to identify which schemes are the most energetically favorable. The calculations show that significant surface relaxation should occur on the (110)-type faces, as well as in response to different protonation schemes on both surface types. This result is consistent with atomic force microscopy observations of phyllosilicate dissolution behavior. Bond-valence methods incorporating bond lengths from calculated structures can be used to predict intrinsic acidity constants for surface functional groups on (110)- and (010)-type edge surfaces. However, the occurrence of surface relaxation poses problems for applying current bond-valence methods. An alternative method is proposed that considers bond relaxation, and accounts for the energetics of various protonation schemes on phyllosilicate edges.

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