Acid/Base Properties and Phenylphosphonic Acid Complexation at the Boehmite/Water Interface

Journal of Colloid and Interface Science
E Laiti, L O ohman

Abstract

Acid/base properties and phenylphosphonic acid (H2L) complexation at the boehmite (gamma-AlOOH)/water interface have been studied by means of potentiometric titrations and batch experiments. All measurements have been performed in 0.100 M Na(Cl) ionic medium at 25degreesC. The experimental data have been evaluated on the basis of the surface complexation concept with the use of the constant capacitance model to account for electrostatic contributions. It was found that the boehmite surface possesses 65% higher proton exchange capacity per surface area unit than previously recorded for an aged gamma-Al2O3 surface. This high surface concentration (0.51 mol/kg gamma-AlOOH; site density = 1.71 sites/nm2) was reflected in the acid/base model as a large contribution from electrostatic forces, and accordingly as a low specific capacitance value. The model describing the acid/base reactions at the boehmite surface is given by the following reactions, intrinsic constants, and specific capacitance: $\displaylines{ \hfill\equiv\!\!\equiv \hbox{AlOH} + \hbox{H}^+ {\enspace}^{\rightarrow}_{\leftarrow}{\enspace} \equiv\!\!\equiv \hbox{AlOH}^+_2;\ \log\beta_{\rm(int)} = 7.47 \pm 0.06\hfill\cr \hfill\equiv\!\!\equiv \hbox{AlOH} {\enspace}^{\ri...Continue Reading

Citations

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Jun 6, 2006·Environmental Science & Technology·María C Zenobi, Elsa H Rueda

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