Proton Adsorption onto Alumina: Extension of Multisite Complexation (MUSIC) Theory

Nagashima, Kazuomi; Blum, Frank D.

doi:10.1006/jcis.1999.6355

Cited by 20 publications

(14 citation statements)

References 39 publications

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“…It should be pointed out that the terminology employed in the literature for "zero point" is plenty, and terms like isoelectric point of the solid (ieps), [69,70] point of zero salt effect (pzse), [73] point of zero net charge (pznc), [74] point of zero net proton charge (pznpc), [74][75][76] and pristine point of zero charge (ppzc) [77,78] can be found.…”

Section: General Considerationsmentioning

confidence: 99%

“…[90] Since then, many models [65,78,81,87,91,92] as well as a great variety of materials such as inorganic metal oxides, [82,86,87,93] mixed oxides, [94] clays, [95][96][97] carbons, [98,99] and humic substances [100,101] have been used to describe proton-binding behavior at oxide/solution interfaces. [90] Since then, many models [65,78,81,87,91,92] as well as a great variety of materials such as inorganic metal oxides, [82,86,87,93] mixed oxides, [94] clays, [95][96][97] carbons, [98,99] and humic substances [100,101] have been used to describe proton-binding behavior at oxide/solution interfaces.…”

Section: γ-Al 2 O 3 Surface Heterogeneitymentioning

confidence: 99%

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γ‐Alumina as a Support for Catalysts: A Review of Fundamental Aspects

2005

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The present review discusses the most important aspects to take into consideration to improve the properties of γ‐Al2O3 as a support for catalytic applications. We show that the synthetic route to γ‐Al2O3 is the starting point that determines the micro‐ and macrostructure of the oxide and, consequently, allows control of the support characteristics. The relevance of the adequate structural characterization of the oxide as well as of its surface sorption behavior through the proton‐affinity distributions, are considered. The usefulness of the latter during supported catalyst preparation, for catalytic active sites characterization, and for stability evaluation after calcination are discussed for the Co/γ‐Al2O3 system in particular. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)

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Section: General Considerationsmentioning

confidence: 99%

Section: γ-Al 2 O 3 Surface Heterogeneitymentioning

confidence: 99%

γ‐Alumina as a Support for Catalysts: A Review of Fundamental Aspects

2005

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“…In the present study, chloride, nitrate and sodium were found to not complex with the adsorbent i.e., they were non-reactive. Similarly Nagashima and Blum (1999) found that Na + did not affect the adsorption of H + onto γ− alumina. Thus, it is assumed that − − − AlOH + 2 is neutralized by either Clor NO -3 .…”

Section: A Model For Titration and Batch Adsorptionmentioning

confidence: 90%

Modelling the adsorption of fluoride onto activated alumina in the presence of other ions

Samrat

Gandhi

Rao

2020

Journal of Environmental Chemical Engineering

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“…The heterogeneous distribution results from a defect or a chemical impurity on a crystal plan, material coexistence or by a passivation of the surface. 37 The patch occurs when different materials coexist or when crystal planes are not large enough to neglect boundary interactions. 38,39 Four different spatial site distributions are studied: (i) homogeneous site distribution (Fig.…”

Section: Surface Titrating Site Distributionmentioning

confidence: 99%

Surface charging behavior of nanoparticles by considering site distribution and density, dielectric constant and pH changes – a Monte Carlo approach

Clavier

Seijo

Carnal

et al. 2015

Phys. Chem. Chem. Phys.

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Monte Carlo simulations are used to describe the charging behavior of metal oxide nanoparticles thus enabling a novel and original approach to predict nanoparticle reactivity and the possible interactions with biological and environmental molecules. The charging behavior of spherical nanoparticles is investigated by adjusting the pH of the media and the influence of surface site distribution, density and dielectric constant as well as the acid/base properties of the surface sites and ΔpKa(0) values (difference between two successive deprotonation constants) is systematically studied using a grand canonical Monte Carlo method. A primitive Coulomb model is applied to describe the interaction energies between the explicit discrete sites. Homogeneous/heterogeneous surfaces and patches with homogeneous and heterogeneous distributions are considered in order to reproduce possible site distributions of metal oxide nanoparticles. Two models are used. In the 1-pKa(0) model (one deprotonation step) the results indicate that the deprotonation process is controlled by inter-site distances which are defined by site distributions and densities. It is shown that the homogeneous surface is the most efficient site distribution to obtain high ionization degrees. In the 2-pKa(0) model (two deprotonation steps), the ΔpKa(0) value is found to control the surface charge properties with regard to pH changes. By considering the variation of the total nanoparticle surface charge as a function of pH our results help in the distinction between the zero charge and the isoelectric point and interpretation of experimental NP titration curves.

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Proton Adsorption onto Alumina: Extension of Multisite Complexation (MUSIC) Theory

Cited by 20 publications

References 39 publications

γ‐Alumina as a Support for Catalysts: A Review of Fundamental Aspects

γ‐Alumina as a Support for Catalysts: A Review of Fundamental Aspects

Modelling the adsorption of fluoride onto activated alumina in the presence of other ions

Surface charging behavior of nanoparticles by considering site distribution and density, dielectric constant and pH changes – a Monte Carlo approach

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