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Article Dans Une Revue Journal of Physical Chemistry C Année : 2021

Phosphate adsorption on γ-alumina: a surface complex model based on surface characterization and zeta potential measurements

Résumé

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 µ 1-Al IV-OH sites located on the (110) facet, a bidentate involving µ 1-Al V-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 AlPO 4 phase, experimentally observed by FTIR and zetametry measurements.

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Chimie
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Dates et versions

hal-03379556 , version 1 (15-10-2021)

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Teddy Roy, Dorothea Wisser, Mickaël Rivallan, Manuel Corral Valero, Thibaut Corre, et al.. Phosphate adsorption on γ-alumina: a surface complex model based on surface characterization and zeta potential measurements. Journal of Physical Chemistry C, 2021, 125 (20), pp.10909-10918. ⟨10.1021/acs.jpcc.0c11553⟩. ⟨hal-03379556⟩
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