Ion sorption on modified silica surface

Kudryavtsev, G.V.; Miltchenko, Dmitrii V; Yagov, V. V.; Lopatkin, A. A.

doi:10.1016/0021-9797(90)90328-l

Cited by 45 publications

(25 citation statements)

References 22 publications

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“…The model of fixed bidentate centers [19] was used in this work. According to it, the sorbent surface is considered as the assemblage of independent centers containing two 3-n-propyl(4-methylpyridinium) cations and the sorption process is represented by the following reactions: for HgCl 2 (Schemes 3 and 4) and for Zn 2+ and Cd 2+ by Schemes 5 and 6, where σ i (2) are the constants of the sorption equilibrium (heterogeneous stability constants of immobilized complexes) in the model of fixed bidentate centers, subscript (2) corresponds to the number of cations ∼Pic + included in one sorption center, superscript i is the number of MCl 2 entities joined to this sorption center.…”

Section: Determination Of the Affinity Constants: Model And Calculatimentioning

confidence: 99%

Synthesis, characterization and metal adsorption properties of the new ion exchanger polymer 3-n-propyl(4-methylpyridinium) silsesquioxane chloride

Magosso

Panteleimonov

Kholin

et al. 2006

Journal of Colloid and Interface Science

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Section: Determination Of the Affinity Constants: Model And Calculatimentioning

confidence: 99%

Synthesis, characterization and metal adsorption properties of the new ion exchanger polymer 3-n-propyl(4-methylpyridinium) silsesquioxane chloride

Magosso

Panteleimonov

Kholin

et al. 2006

Journal of Colloid and Interface Science

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“…The contradiction is easily overcome with the help of the model of fixed polyndentate centers. 26 According to it, the surface of the material is considered as the assemblage of centers, and each center contains several attached functional groups. Hence, the adsorption of MCl 2 (M = Co or Cu) may be described by the model of fixed bidentate centers in the following way: (9) where the first index at β points to the size of the polyndentate center while the second one corresponds to the number of metal chloride entities bound by each center.…”

Section: Adsorption Isotherms and Constants Of The Adsorption Equilibriamentioning

confidence: 99%

Cellulose acetate-Al2O3 hybrid material coated with N-Propyl-1,4-diazabicyclo [2.2.2] octane chloride: preparation, characterization and study of some metal halides adsorption from ethanol solution

Splendore¹,

Benvenutti²,

Kholin³

et al. 2005

J. Braz. Chem. Soc.

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) and its affinities to the metal halides were determined by analyzing the adsorption isotherms with the help of the model of fixed polydentate centers. The constants of the adsorption equilibria (β, in L mol -1 ) were used as the quantitative characteristics of affinity. For the FeCl 3 adsorption equilibrium the specific concentration of the sorption centers t σ-L + Clis equal to 1.42 and log β 11 = 3.14. The adsorption of CoCl 2 and CuCl 2 (MCl 2 ) is described in a more complicated way:The following values of parameters were obtained: t {σ -L+ Cl-} 2 = 0.20 and 0.115; log β 21 = 4.08 and 3.3 for CoCl 2 and CuCl 2 respectively.

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“…The choice of copper(II) as the adsorbed metals is due to its large affinity for nitrogen present in the nitrogenated silicas giving larger and more reliable N f values relative to experimental error. Some studies already used copper(II) as a model in order to calculate stability constants of adsorbed metals on organofunctionalized silicas (27)(28)(29). The contact time and silica mass variables were chosen because of their importance as demonstrated in our previous observations made with the aim of determining the most important experimental factors involved in the desorption process.…”

Section: Resultsmentioning

confidence: 99%