Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II)
As opposed to polymer sorbents, inorganic materials are stable against ionizing radiation. This gives a possibility to use them for the removal of radionuclides from water. As a rule, highly selective inorganic sorbents are obtained in a form of finely dispersive powder. This makes it difficult to...
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Chuiko Institute of Surface Chemistry of NAS of Ukraine
2021-11-01
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| Series: | Хімія, фізика та технологія поверхні |
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| Online Access: | https://cpts.com.ua/index.php/cpts/article/view/604 |
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| author | O. V. Perlova Yu. S. Dzyazko A. A. Malinovska A. V. Palchik |
| author_facet | O. V. Perlova Yu. S. Dzyazko A. A. Malinovska A. V. Palchik |
| author_sort | O. V. Perlova |
| collection | DOAJ |
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As opposed to polymer sorbents, inorganic materials are stable against ionizing radiation. This gives a possibility to use them for the removal of radionuclides from water. As a rule, highly selective inorganic sorbents are obtained in a form of finely dispersive powder. This makes it difficult to use them in practice. Here the composites based on hydrated titanium dioxide containing K2Co[Fe(CN)6] have been developed. The modifier was inserted into partially (hydrogel) and fully (xerogel) formed oxide matrices. Modifying of hydrogel followed its transformation to xerogel provides the formation of potassium-cobalt hexacyanoferrate(II) nanoparticles (up to 10 nm), which are not washed out in aqueous media due to encapsulation in hydrated oxide. A number of the methods for sample characterization were used in this work: transmission electronic microscopy for vizualization of embedded nanoparticles, optical microscopy to measure granule size, FT-IR spectroscopy, X-ray fluorescence spectroscopy for chemical analysis of the samples, potentiometric titration to estimate ion exchange properties, and spectrophotometric analysis of the solution to determine U(VI) concentration. The features of U(VI) sorption from nitrate and sulfate solutions are considered: the effect of the sorbent dosage and solution composition was in a focus of attention. The influence of the modifier is the most pronounced at pH ? 4, when U(VI) is in a form of one-charged cations (UO2OH+): the removal degree of U(VI) is close to 100 %. This positive effect of the selective constituent is expressed in a presence of an excess of NO3–, SO42– and Na+ ions. The model of chemical reaction of pseudo second order has been applied to sorption. Both pristine sorbent and composite are most completely regenerated with a 0.1 M KOH solution - the regeneration degree is 92 and 96 % respectively. In this case, the half-exchange time is minimal and equal to » 23 min (initial hydrated titanium dioxide) and 47 min (composite). Desorption obeys the model of particle diffusion: the diffusion coefficients for ions being exchanged are (1.7–7.6)?10–13 m2s–1.
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| format | Article |
| id | doaj-art-e4b082b8fa1241f5aa4dcaa1952ffef7 |
| institution | DOAJ |
| issn | 2079-1704 2518-1238 |
| language | English |
| publishDate | 2021-11-01 |
| publisher | Chuiko Institute of Surface Chemistry of NAS of Ukraine |
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| series | Хімія, фізика та технологія поверхні |
| spelling | doaj-art-e4b082b8fa1241f5aa4dcaa1952ffef72025-08-20T03:15:03ZengChuiko Institute of Surface Chemistry of NAS of UkraineХімія, фізика та технологія поверхні2079-17042518-12382021-11-0112410.15407/hftp12.04.344Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II)O. V. Perlova0Yu. S. Dzyazko1A. A. Malinovska2A. V. Palchik3Odessa I.I. Mechnikov National UniversityVernadsky Institute of General and Inorganic Chemistry of National Academy of Sciences of UkraineOdessa I.I. Mechnikov National UniversityVernadsky Institute of General and Inorganic Chemistry of National Academy of Sciences of Ukraine As opposed to polymer sorbents, inorganic materials are stable against ionizing radiation. This gives a possibility to use them for the removal of radionuclides from water. As a rule, highly selective inorganic sorbents are obtained in a form of finely dispersive powder. This makes it difficult to use them in practice. Here the composites based on hydrated titanium dioxide containing K2Co[Fe(CN)6] have been developed. The modifier was inserted into partially (hydrogel) and fully (xerogel) formed oxide matrices. Modifying of hydrogel followed its transformation to xerogel provides the formation of potassium-cobalt hexacyanoferrate(II) nanoparticles (up to 10 nm), which are not washed out in aqueous media due to encapsulation in hydrated oxide. A number of the methods for sample characterization were used in this work: transmission electronic microscopy for vizualization of embedded nanoparticles, optical microscopy to measure granule size, FT-IR spectroscopy, X-ray fluorescence spectroscopy for chemical analysis of the samples, potentiometric titration to estimate ion exchange properties, and spectrophotometric analysis of the solution to determine U(VI) concentration. The features of U(VI) sorption from nitrate and sulfate solutions are considered: the effect of the sorbent dosage and solution composition was in a focus of attention. The influence of the modifier is the most pronounced at pH ? 4, when U(VI) is in a form of one-charged cations (UO2OH+): the removal degree of U(VI) is close to 100 %. This positive effect of the selective constituent is expressed in a presence of an excess of NO3–, SO42– and Na+ ions. The model of chemical reaction of pseudo second order has been applied to sorption. Both pristine sorbent and composite are most completely regenerated with a 0.1 M KOH solution - the regeneration degree is 92 and 96 % respectively. In this case, the half-exchange time is minimal and equal to » 23 min (initial hydrated titanium dioxide) and 47 min (composite). Desorption obeys the model of particle diffusion: the diffusion coefficients for ions being exchanged are (1.7–7.6)?10–13 m2s–1. https://cpts.com.ua/index.php/cpts/article/view/604Uranium(VI) compoundshydrated titanium dioxidepotassium-cobalt hexacyanoferrate(II)sorptionnanoparticles |
| spellingShingle | O. V. Perlova Yu. S. Dzyazko A. A. Malinovska A. V. Palchik Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II) Хімія, фізика та технологія поверхні Uranium(VI) compounds hydrated titanium dioxide potassium-cobalt hexacyanoferrate(II) sorption nanoparticles |
| title | Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II) |
| title_full | Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II) |
| title_fullStr | Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II) |
| title_full_unstemmed | Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II) |
| title_short | Peculiarities of U(VI) sorption on composites containing hydrated titanium dioxide and potassium-cobalt hexacyanoferrate(II) |
| title_sort | peculiarities of u vi sorption on composites containing hydrated titanium dioxide and potassium cobalt hexacyanoferrate ii |
| topic | Uranium(VI) compounds hydrated titanium dioxide potassium-cobalt hexacyanoferrate(II) sorption nanoparticles |
| url | https://cpts.com.ua/index.php/cpts/article/view/604 |
| work_keys_str_mv | AT ovperlova peculiaritiesofuvisorptiononcompositescontaininghydratedtitaniumdioxideandpotassiumcobalthexacyanoferrateii AT yusdzyazko peculiaritiesofuvisorptiononcompositescontaininghydratedtitaniumdioxideandpotassiumcobalthexacyanoferrateii AT aamalinovska peculiaritiesofuvisorptiononcompositescontaininghydratedtitaniumdioxideandpotassiumcobalthexacyanoferrateii AT avpalchik peculiaritiesofuvisorptiononcompositescontaininghydratedtitaniumdioxideandpotassiumcobalthexacyanoferrateii |