Heather Gulley-Stahl

Publications (2)10.46 Total impact

• Article: Response to "Comment on 'Surface Complexation of Catechol to Metal Oxides: An ATR-FTIR, Adsorption, and Dissolution Study'".

  Heather Gulley-Stahl, Patrick A Hogan, Whitney L Schmidt, Stephen J Wall, Andrew Buhrlage, Heather A Bullen
  Environmental Science and Technology 08/2010; 44(16):6519. · 5.23 Impact Factor
• Article: Surface complexation of catechol to metal oxides: an ATR-FTIR, adsorption, and dissolution study.

  Heather Gulley-Stahl, Patrick A Hogan, Whitney L Schmidt, Stephen J Wall, Andrew Buhrlage, Heather A Bullen
  [show abstract] [hide abstract]
  ABSTRACT: The interaction of catechol with chromium(III) oxide (Cr(2)O(3)), manganese dioxide (MnO(2)), iron(III) oxide (Fe(2)O(3)), and titanium dioxide (TiO(2)) was evaluated as a function of pH conditions (pH 3-10) and ionic strength using a combined approach of bulk adsorption, attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), and dissolution analysis. Adsorption of catechol showed a strong pH-dependent behavior with the metal oxides, remaining constant under acidic-neutral pH (3-7) and increasing under more basic conditions. In situ ATR-FTIR measurements indicate that catechol binds predominately as an outer-sphere complex on MnO(2) and as an inner-sphere complex on Fe(2)O(3), TiO(2), and Cr(2)O(3) substrates. Catechol complexation on Fe(2)O(3), TiO(2), and Cr(2)O(3) promotes dissolution at pH >5, whereas MnO(2) dissolution occurs under acidic and basic conditions (pH 3-10).
  Environmental Science and Technology 06/2010; 44(11):4116-21. · 5.23 Impact Factor