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Temperature effects on the surface acidity properties of zirconium diphosphate

Abstract : As part of the temperature effects study on the sorption of metallic cations onto zirconium diphosphate, we have first investigated the intrinsic surface properties of this synthetic compound for different temperatures (25, 50, 75 and 90 °C). A physico-chemical study (IR, XRD) assessed its purity, and the measured N2-BET specific area was Click to view the MathML source. Mass and potentiometric titrations showed that the experimental point of zero charge (pHpzc=2.6±0.2) and the surface site density remained constant between 25 and 90 °C. The potentiometric titration data were simulated with the constant capacitance model, considering two reactive surface sites, with a total surface site density equal to Click to view the MathML source. The intrinsic protonation and deprotonation constants were found to increase with the temperature, as well as the calculated apparent constants. The simulation results showed that the capacitance increased with the temperature. The proportions of the neutral, protonated and deprotonated forms for each site type were quantified thermodynamically by application of the Van't Hoff relation.
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Submitted on : Tuesday, October 16, 2007 - 9:37:58 AM
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N. Finck, R. Drot, F. Mercier-Bion, E. Simoni, H. Catalette. Temperature effects on the surface acidity properties of zirconium diphosphate. Journal of Colloid and Interface Science, Elsevier, 2007, 312, pp.230-236. ⟨10.1016/j.jcis.2007.03.070⟩. ⟨in2p3-00179565⟩



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