SORPTION REMOVAL OF Sr2+ AND Y3+ IONS FROM AQUEOUS SOLUTIONS BY A TiO2 -BASED SORBENT

Myroniuk, I. F.; Vasylyeva, Hanna

doi:10.21175/radproc.2018.04

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…Scheme of the experiment of separation of strontium, yttrium and zirconium ions and subsequent ICP-MS analysis. neutral or alkaline environment, the adsorption of strontium ions by these adsorbents is extremely intense [9][10][11][12][13][14]. Ionic radius of Zr 4+ is smaller than the corresponding value of Sr 2+ or Y 3+ (0.84 Å compared to 1.02 Å for Y 3+ and 1.26 Å for Sr 2+ ions) [26].…”

Section: Selective Adsorption Of Zirconium Ions From the Mixturementioning

confidence: 99%

“…Adsorbents based on mesoporous TiO2 showed high adsorption activity toward many cations, such as strontium, barium, zinc, cobalt, and yttrium [9][10][11][12][13][14][15]. The uniqueness of the properties of adsorbents based on mesoporous TiO2 is due to the developed surface area and a large number of adsorption centers on it in combination with the predominantly crystalline structure of TiO2.…”

Section: Introductionmentioning

confidence: 99%

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Application of Titanium Dioxide for Zirconium Ions Adsorption and Separation from a Multicomponent Mixture

Vasylyeva

Mironyuk

Mykytyn

et al. 2021

Phys. Chem. Solid St.

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This work studies the adsorption of zirconium ions by mesoporous titanium dioxide and by sodium-modified mesoporous titanium dioxide. Experimental maximal adsorption values of zirconium ions by H-TiO2 and Na-TiO2 were found to be 64 mg/g and 109,5 mg/g respectively. This process depends on the interaction time, equilibrium concentration of zirconium ions and acidity of the solution. Adsorption kinetics fit well into the diffusion kinetic model and indicate a several stages of zirconium ions adsorption. Equilibrium adsorption of zirconium ions is well described by the Langmuir's adsorption theory for both adsorbents. The results obtained by inductively coupled plasma mass spectrometry showed that the investigated adsorbent selectively adsorb zirconium ions from the mixture with strontium and yttrium ions in the range of solution pH = 0-1. The percentage of maximum extraction of zirconium ions is 86,61% for H-TiO2 and 94,11% for Na-TiO2. This fact is extremely valuable for nuclear forensics or for the determination of 90Sr in low activity background samples.

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Section: Selective Adsorption Of Zirconium Ions From the Mixturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Titanium Dioxide for Zirconium Ions Adsorption and Separation from a Multicomponent Mixture

Vasylyeva

Mironyuk

Mykytyn

et al. 2021

Phys. Chem. Solid St.

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“…In addition to Diffusion kinetic model, for example, intra particle diffusion -the limiting step of sorption is the diffusion stage of Sr 2+ from solution to the surface of sorbent. Diffusion in micro porous carries the character of activated diffusion, which usually is described by Weber and Morris [4][5][6]. The experimental data is the plot in coordinate A t vs t ½ .…”

Section: Linear Equation Of Kinetic Modelmentioning

confidence: 99%

Kinetic of sorption of Sr2+ ions from aqueous solutions by synthetic inorganic sorbents

Vasylyeva¹,

Kylivnyk²,

Vuchkan³

et al. 2018

Sci.Herald.Uzh.Univ.Ser.Phys

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Purpose: All chemical processes including adsorption occur in complicated mechanism and are reversible. After some time equilibrium has introduce. These complex mechanisms can be divide into a number of simple stages, wh ich can b e describe by relatively simple mathematical equation. In this study the adsorptio n o f Sr 2+ ions from aqueous solutions by synthetic inorganic sorbents Titanium Phosphate (PhTi) and Zirconium Silicate (ZrSi) was investigate. To simulate the adsorption kinetic, two commonly used models Elovich and Diffusion kinetic models were apply. In addition to Elovich kinetic model experimental data of sorption must have a linear dependence in coordinates At vs ln t, investigating adsorption processes is chemisorption, and limiting step of ad so rpt ion is s urface chemical reaction. In addition to Diffusion kinetic model, for example, intra particle diffusion -the limiting step of adsorption is the diffusion stage of Sr 2+ from solutio n to the surface of sorbent. Diffusion in micro porous carries the character of activated diffusion, which usually described by Weber and Morris. The experimental d at a is the plot in coordinate At vs t ½ . Methods: Titanium Phosphate (PhTi) and Zirconium Silicate (ZrSi) synthesized in Institute of Sorption and Endoecology Problems NAS of Ukraine, Kiyv. Porous radius and volume, as well as surface area were investigate in the same institute using low temperature adsorption-desorption of Nitrogen and BET adsorption equation. To study the effect of pH and agitation time on adsorp tio n o f Sr 2+ io n s , batch studies performed and unabsorbed ions of Sr 2+ analyzed using complexonometric titration. Results: For all the systems, which examined, the Elovich kinetic model p ro v id ed better correlation of the experimental data. For ZrSi the stage of diffusion deep in t o the sorbent is also an important stage. This is due to the fact, that Zirconium Silicat e is a micro porous material with a narrow distribution of pore radii. It was o b s erv e that maximum adsorption coefficients take place at pH ~ 11. Conclusions: It was shown, that adsorption of Sr 2+ ions strongly depend on t ime o f interaction between solution and surface of sorbents; as well as solutio n's acid it y. The sorption coefficients of Sr 2+ by Titanium Phosphate are higher than by Zirconium Silicate. To simulate the adsorption kinetics, two commonly used models Elovich and Diffusion were apply. For all the systems, the Elovich kinetic model provided better correlation. It was observe that maximum adsorptio n co efficient s take place at pH ~ 11. The pH of the solution may change the surface charge o f t h e adsorbent and increase the probability of surface complex formation of -OH-Sr + o r -OH-Sr-OH compounds.

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“…Some scientific publications are devoted to investigations of adsorption of strontium and other heavy metals by adsorbents based on titanium compounds [8,10,14,15]. Among such compounds titanium silicate occupies a significant place.…”

Section: Introductionmentioning

confidence: 99%

The titanium silicate influence on the Zn(II) and Sr(II) migration in the aquatic environment

Kylivnik¹,

Tryshyn²,

Strilchuk³

et al. 2020

Nucl. Phys. At. Energy

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The aim of the present work is titanium silicate influence on the zinc and strontium migration in the aquatic environment. The adsorption capacity of titanium silicate toward zinc and strontium ions was investigated. With the aid of a fluorescent X-ray analyzer and energy dispersive spectroscopy the composition of the sorbent formed was determined as well as zinc and strontium presence on the surface of the sorbent after the sorption process. It was shown, that adsorption of zinc and strontium by titanium silicate strongly depends on time of interaction and solution acidity and increases with increasing of both parameters. It was established, that for the initial concentration of zinc and strontium at the level of 0.005M the presence of ions that cause the natural mineralization of water does not affect their adsorption extraction.

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SORPTION REMOVAL OF Sr²⁺ AND Y³⁺ IONS FROM AQUEOUS SOLUTIONS BY A TiO₂ -BASED SORBENT

Cited by 3 publications

References 10 publications

Application of Titanium Dioxide for Zirconium Ions Adsorption and Separation from a Multicomponent Mixture

Application of Titanium Dioxide for Zirconium Ions Adsorption and Separation from a Multicomponent Mixture

Kinetic of sorption of Sr<sup>2+</sup> ions from aqueous solutions by synthetic inorganic sorbents

The titanium silicate influence on the Zn(II) and Sr(II) migration in the aquatic environment

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