Composite Sorbents Based on Polymeric Se-Derivative of Amidoximes and SiO<sub>2</sub> for the Uranium Removal from Liquid Mineralized Media
A new composite material with enhanced sorption-selective properties for uranium recovery from liquid media has been obtained. Sorbents were synthesized through a polycondensation reaction of a mixture of 4-amino-N’-hydroxy-1,2,5-oxadiazole-3-carboximidamide (hereinafter referred to as amidoxime) an...
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2024-12-01
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| author | Anna I. Matskevich Konstantin V. Maslov Veronika A. Prokudina Daria D. Churakova Vladimir V. Korochencev Oleg Yu. Slabko Evgenij A. Eliseenko Eduard A. Tokar’ |
| author_facet | Anna I. Matskevich Konstantin V. Maslov Veronika A. Prokudina Daria D. Churakova Vladimir V. Korochencev Oleg Yu. Slabko Evgenij A. Eliseenko Eduard A. Tokar’ |
| author_sort | Anna I. Matskevich |
| collection | DOAJ |
| description | A new composite material with enhanced sorption-selective properties for uranium recovery from liquid media has been obtained. Sorbents were synthesized through a polycondensation reaction of a mixture of 4-amino-N’-hydroxy-1,2,5-oxadiazole-3-carboximidamide (hereinafter referred to as amidoxime) and SiO<sub>2</sub> in an environment of organic solvents (acetic acid, dioxane) and highly porous SiO<sub>2</sub>. To establish optimal conditions for forming the polymer sorption-active part and the synthesis as a whole, a series of composite adsorbents were synthesized with varying amidoxime/matrix ratios (35/65, 50/50, 65/35). The samples were characterized with FT-IR, XRD, SEM, EDX, XRFES spectroscopy and TGA. Under static conditions of uranium sorption, the dependence of the efficiency of radionuclide recovery from mineralized solutions of various acidities on the ratio of the initial components was established. In the pH range from 4 to 8 (inclusive), the uranium removal efficiency exceeds 95%, while the values of the distribution coefficients (Kd) exceed 10<sup>4</sup> cm<sup>3</sup>g<sup>−1</sup>. It was demonstrated that an increase in the surface development of the sorbents enhances such kinetic parameters of uranium sorption as diffusion rate by 10–20 times compared to non-porous materials. The values of the maximum static capacity exceed 700 mg g<sup>−1</sup>. The enhanced availability of adsorption centers, achieved through the use of a porous SiO<sub>2</sub> matrix, significantly improves the kinetic parameters of the adsorbents. A composite with optimal physicochemical and sorption properties (amidoxime/matrix ratio of 50/50) was examined under dynamic conditions of uranium sorption. It was found that the maximum dynamic sorption capacity of porous materials is four times greater compared to that of a non-porous adsorbent Se-init. The effective filter cycle exceeds 3200 column volumes—twice that of an adsorbent with a monolithic surface. These results indicate the promising potential of the developed materials for uranium sorption from liquid mineralized media under dynamic conditions across a wide pH range. |
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| institution | Kabale University |
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| spelling | doaj-art-19765496333b411d8b42a0d744c628ca2025-01-24T13:33:46ZengMDPI AGGels2310-28612024-12-011111410.3390/gels11010014Composite Sorbents Based on Polymeric Se-Derivative of Amidoximes and SiO<sub>2</sub> for the Uranium Removal from Liquid Mineralized MediaAnna I. Matskevich0Konstantin V. Maslov1Veronika A. Prokudina2Daria D. Churakova3Vladimir V. Korochencev4Oleg Yu. Slabko5Evgenij A. Eliseenko6Eduard A. Tokar’7Institute of Natural Sciences and Technosphere Safety, Sakhalin State University, 693000 Yuzhno-Sakhalinsk, RussiaInstitute of Natural Sciences and Technosphere Safety, Sakhalin State University, 693000 Yuzhno-Sakhalinsk, RussiaInstitute of Natural Sciences and Technosphere Safety, Sakhalin State University, 693000 Yuzhno-Sakhalinsk, RussiaInstitute of High Technologies and Advanced Materials, Far Eastern Federal University, 690922 Vladivostok, RussiaInstitute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, 690022 Vladivostok, RussiaInstitute of High Technologies and Advanced Materials, Far Eastern Federal University, 690922 Vladivostok, RussiaInstitute of Natural Sciences and Technosphere Safety, Sakhalin State University, 693000 Yuzhno-Sakhalinsk, RussiaInstitute of Natural Sciences and Technosphere Safety, Sakhalin State University, 693000 Yuzhno-Sakhalinsk, RussiaA new composite material with enhanced sorption-selective properties for uranium recovery from liquid media has been obtained. Sorbents were synthesized through a polycondensation reaction of a mixture of 4-amino-N’-hydroxy-1,2,5-oxadiazole-3-carboximidamide (hereinafter referred to as amidoxime) and SiO<sub>2</sub> in an environment of organic solvents (acetic acid, dioxane) and highly porous SiO<sub>2</sub>. To establish optimal conditions for forming the polymer sorption-active part and the synthesis as a whole, a series of composite adsorbents were synthesized with varying amidoxime/matrix ratios (35/65, 50/50, 65/35). The samples were characterized with FT-IR, XRD, SEM, EDX, XRFES spectroscopy and TGA. Under static conditions of uranium sorption, the dependence of the efficiency of radionuclide recovery from mineralized solutions of various acidities on the ratio of the initial components was established. In the pH range from 4 to 8 (inclusive), the uranium removal efficiency exceeds 95%, while the values of the distribution coefficients (Kd) exceed 10<sup>4</sup> cm<sup>3</sup>g<sup>−1</sup>. It was demonstrated that an increase in the surface development of the sorbents enhances such kinetic parameters of uranium sorption as diffusion rate by 10–20 times compared to non-porous materials. The values of the maximum static capacity exceed 700 mg g<sup>−1</sup>. The enhanced availability of adsorption centers, achieved through the use of a porous SiO<sub>2</sub> matrix, significantly improves the kinetic parameters of the adsorbents. A composite with optimal physicochemical and sorption properties (amidoxime/matrix ratio of 50/50) was examined under dynamic conditions of uranium sorption. It was found that the maximum dynamic sorption capacity of porous materials is four times greater compared to that of a non-porous adsorbent Se-init. The effective filter cycle exceeds 3200 column volumes—twice that of an adsorbent with a monolithic surface. These results indicate the promising potential of the developed materials for uranium sorption from liquid mineralized media under dynamic conditions across a wide pH range.https://www.mdpi.com/2310-2861/11/1/14sorptionamidoximeuranium2,5-oxadiazolespolymers |
| spellingShingle | Anna I. Matskevich Konstantin V. Maslov Veronika A. Prokudina Daria D. Churakova Vladimir V. Korochencev Oleg Yu. Slabko Evgenij A. Eliseenko Eduard A. Tokar’ Composite Sorbents Based on Polymeric Se-Derivative of Amidoximes and SiO<sub>2</sub> for the Uranium Removal from Liquid Mineralized Media Gels sorption amidoxime uranium 2,5-oxadiazoles polymers |
| title | Composite Sorbents Based on Polymeric Se-Derivative of Amidoximes and SiO<sub>2</sub> for the Uranium Removal from Liquid Mineralized Media |
| title_full | Composite Sorbents Based on Polymeric Se-Derivative of Amidoximes and SiO<sub>2</sub> for the Uranium Removal from Liquid Mineralized Media |
| title_fullStr | Composite Sorbents Based on Polymeric Se-Derivative of Amidoximes and SiO<sub>2</sub> for the Uranium Removal from Liquid Mineralized Media |
| title_full_unstemmed | Composite Sorbents Based on Polymeric Se-Derivative of Amidoximes and SiO<sub>2</sub> for the Uranium Removal from Liquid Mineralized Media |
| title_short | Composite Sorbents Based on Polymeric Se-Derivative of Amidoximes and SiO<sub>2</sub> for the Uranium Removal from Liquid Mineralized Media |
| title_sort | composite sorbents based on polymeric se derivative of amidoximes and sio sub 2 sub for the uranium removal from liquid mineralized media |
| topic | sorption amidoxime uranium 2,5-oxadiazoles polymers |
| url | https://www.mdpi.com/2310-2861/11/1/14 |
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