Abstract

MUESES, Miguel A.  and  MACHUCA-MARTINEZ, Fiderman. Molecular adsorption model for organic compounds over TiO2 - P25 by protonic distribution affinity. Ing. compet. [online]. 2013, vol.15, n.2, pp.201-209. ISSN 0123-3033.

A predictive molecular adsorption model for organic compounds over TiO2-P25 particles was formulated. The model is an extension of a theoretical method of surface characterization called Protonic Distribution Affinity (PDA), which is obtained from potentiometric titration analysis, zero point charge (ZPC) of the material and adsorption isotherms of the Langmuir-Hinshelwood type. The chemical nature of the compound in the model was established by initial pH and molecular weigh. We found that, for the TiO2-P25, the ZPC was 6.8. The model was validated using experimental data of dichloroacetic acid (DCA), 4-chlorophenol (4-CP) and phenol (PH) to different conditions. The model has high predictive capacity, numerical stability and sturdiness for obtaining the solutions. For available experimental data, the correlation coefficient was 0.97

Keywords : Photocatalysis; protonic distribution affinity; Langmuir-Hinshelwood isotherm; potentiometric titration.

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