Phosphate Adsorption on γ-Alumina: A Surface Complex Model Based on Surface Characterization and Zeta Potential Measurements

Roy T, Wisser D, Rivallan M, Valero MC, Corre T, Delpoux O, Pirngruber GD, Lefèvre G (2021)


Publication Type: Journal article

Publication year: 2021

Journal

Book Volume: 125

Pages Range: 10909-10918

Journal Issue: 20

DOI: 10.1021/acs.jpcc.0c11553

Abstract

An innovative approach using solid/liquid interface characterization (zetametry measurements, ATR-IR), coupled with ex situ FTIR has been used to build a phosphate complexation model at the alumina surface via the PHREEQC software. According to the phosphorus coverage impregnated on the alumina surface, two mechanisms of adsorption have been identified: a specific surface complex adsorbed on the predominant alumina facet and a surface precipitation process. At low phosphorus coverage (P coverage < 1.2 at/nm2), the adsorption proceeds mainly through a monodentate complex adsorbed on μ1-AlIV-OH sites located on the (110) facet, and a bidentate involving μ1-AlV-OH (110) is also discussed. However, the surface concentration of these particular sites is limited. Thus, above the threshold of 1.2 at/nm2, a surface precipitation occurs with the formation of an amorphous AlPO4 phase, experimentally observed by FTIR and zetametry measurements.

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APA:

Roy, T., Wisser, D., Rivallan, M., Valero, M.C., Corre, T., Delpoux, O.,... Lefèvre, G. (2021). Phosphate Adsorption on γ-Alumina: A Surface Complex Model Based on Surface Characterization and Zeta Potential Measurements. Journal of Physical Chemistry C, 125(20), 10909-10918. https://dx.doi.org/10.1021/acs.jpcc.0c11553

MLA:

Roy, Teddy, et al. "Phosphate Adsorption on γ-Alumina: A Surface Complex Model Based on Surface Characterization and Zeta Potential Measurements." Journal of Physical Chemistry C 125.20 (2021): 10909-10918.

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