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Aquatic Geochemistry

, Volume 21, Issue 2–4, pp 99–121 | Cite as

Adsorption of Benzoic Acid and Related Carboxylic Acids onto FeOOH(Goethite): The Low Ionic Strength Regime

  • Charles F. Whitehead
  • Richard F. Carbonaro
  • Alan T. Stone
Original Paper

Abstract

In the absence of added electrolyte, at ionic strengths below 0.5 mM, maximum extents on adsorption of 100 μM ligand onto 1.06 g L−1 FeOOH(goethite) increased in the order (2-phenylglycine) < phenylacetate < 5-methyl-2-anthranilate < anthranilate < 4-aminobenzoate ~ N-phenylglycine < benzoate < 4-hydroxybenzoate < 4-nitrobenzoate ~ salicylate. With salicylate, the maximum extent of adsorption occurred at a pH 0.60 log units higher than pKa(0/−), which corresponds to conversion of the monoanion to the protonated, neutral species. With the other eight ligands, maximum extents of adsorption occurred within 0.40 log units of pKa(0/−). Capillary electrophoresis enabled us to quantify extents of adsorption and confirm that added ligand had not undergone chemical alteration. The computer program DLIM performed the usual tasks of computer equilibrium speciation models, but also made it possible to integrate concentrations of ionic species from the surface outward toward bulk solution, yielding the nonspecific contribution to adsorption. DLIM enabled us to track changes to ionic strength as a function of reagents added and measured pH. In the low ionic strength regime, the adsorption stoichiometry \({>}{\text{SOH}} + {\text{L}}^{-} = {>}{\text{S}}\left( {\text{OH}} \right){\text{L}}^{ - }\) provided a better fit to experimental data for most ligands than the conventional stoichiometry \({>}{\text{SOH}} + {\text{H}}^{ + } + {\text{L}}^{ - } = {>}{\text{SL}}^{0} + {\text{H}}_{2} {\text{O}}\). Partial loss of waters of adsorption accompanying adsorption impedes the adsorption of strongly hydrated anions over less strongly hydrated ones.

Keywords

Adsorption Diffuse layer Specific adsorption Nonspecific adsorption Benzoic acid Phenylacetic acid 

Notes

Acknowledgments

This project was supported by the National Research Initiative of the USDA Cooperative State Research, Education, and Extension Service, Grant Number 9800786, and by the Environmental Engineering Program of the National Science Foundation (Grant BES9317842).

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Charles F. Whitehead
    • 1
  • Richard F. Carbonaro
    • 2
  • Alan T. Stone
    • 3
  1. 1.Geomega Environmental ConsultingBoulderUSA
  2. 2.Department of Civil and Environmental EngineeringManhattan CollegeRiverdaleUSA
  3. 3.Department of Geography and Environmental EngineeringJohns Hopkins UniversityBaltimoreUSA

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