Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive Conditions
The article is devoted to the evolution of structural, morphological, and sorption characteristics of layered manganese oxide (birnessite) under various conditions close to the real operating regime of the sorbents for radioactive waste processing. To identify the phase composition in the birnessite...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-12-01
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| Series: | Colloids and Interfaces |
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| Online Access: | https://www.mdpi.com/2504-5377/2/4/70 |
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| author | Arseniy Portnyagin Andrey Egorin Alexey Golikov Eduard Tokar Vitaliy Mayorov Nina Didenko Dmitry Mashtalyar Tatiana Sokol’nitskaya Valentine Avramenko |
| author_facet | Arseniy Portnyagin Andrey Egorin Alexey Golikov Eduard Tokar Vitaliy Mayorov Nina Didenko Dmitry Mashtalyar Tatiana Sokol’nitskaya Valentine Avramenko |
| author_sort | Arseniy Portnyagin |
| collection | DOAJ |
| description | The article is devoted to the evolution of structural, morphological, and sorption characteristics of layered manganese oxide (birnessite) under various conditions close to the real operating regime of the sorbents for radioactive waste processing. To identify the phase composition in the birnessites, we implemented XRD analysis, while SEM and temperature-programmed reduction (TPR) were used to study morphological and redox features of the materials, respectively. Structural changes after various kinds of treatment of birnessites were tracked using low temperature nitrogen sorption. Sorption characteristics were assessed under static and in dynamic conditions on the efficiency of Sr<sup>2+</sup> removal from simulated seawater. TPR combined with kinetic analysis revealed the decrease of particle sizes in the birnessites after repeated use in sorption-regeneration cycle and reduction with hydrazine. Despite the fact that the porous structure of the materials remains preserved, the surface morphology of birnessite changes drastically depending on the reducing agent. Hydrazine treatment increases the sorption performance of the birnessite followed by degradation of mechanical properties, thus, preventing such sorbent from repeated use. Kinetic analysis of TPR allows quantifying differences in morphology and porous structure of manganese oxide materials. The specific surface area, amorphous surface structure, and accessibility of Mn<sup>+3</sup> sites are the most important factors for birnessite sorption performance. |
| first_indexed | 2024-04-13T12:03:41Z |
| format | Article |
| id | doaj.art-42589271bcba42d39887c75832ebd1aa |
| institution | Directory Open Access Journal |
| issn | 2504-5377 |
| language | English |
| last_indexed | 2024-04-13T12:03:41Z |
| publishDate | 2018-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Colloids and Interfaces |
| spelling | doaj.art-42589271bcba42d39887c75832ebd1aa2022-12-22T02:47:42ZengMDPI AGColloids and Interfaces2504-53772018-12-01247010.3390/colloids2040070colloids2040070Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive ConditionsArseniy Portnyagin0Andrey Egorin1Alexey Golikov2Eduard Tokar3Vitaliy Mayorov4Nina Didenko5Dmitry Mashtalyar6Tatiana Sokol’nitskaya7Valentine Avramenko8Institute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaInstitute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaInstitute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaInstitute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaInstitute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaInstitute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaInstitute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaInstitute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaInstitute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Pr. 100-letiya Vladivostoka 159, Vladivostok 690022, RussiaThe article is devoted to the evolution of structural, morphological, and sorption characteristics of layered manganese oxide (birnessite) under various conditions close to the real operating regime of the sorbents for radioactive waste processing. To identify the phase composition in the birnessites, we implemented XRD analysis, while SEM and temperature-programmed reduction (TPR) were used to study morphological and redox features of the materials, respectively. Structural changes after various kinds of treatment of birnessites were tracked using low temperature nitrogen sorption. Sorption characteristics were assessed under static and in dynamic conditions on the efficiency of Sr<sup>2+</sup> removal from simulated seawater. TPR combined with kinetic analysis revealed the decrease of particle sizes in the birnessites after repeated use in sorption-regeneration cycle and reduction with hydrazine. Despite the fact that the porous structure of the materials remains preserved, the surface morphology of birnessite changes drastically depending on the reducing agent. Hydrazine treatment increases the sorption performance of the birnessite followed by degradation of mechanical properties, thus, preventing such sorbent from repeated use. Kinetic analysis of TPR allows quantifying differences in morphology and porous structure of manganese oxide materials. The specific surface area, amorphous surface structure, and accessibility of Mn<sup>+3</sup> sites are the most important factors for birnessite sorption performance.https://www.mdpi.com/2504-5377/2/4/70H<sub>2</sub>-TPRseawaterSr-90birnessitekinetic analysiscubic splines |
| spellingShingle | Arseniy Portnyagin Andrey Egorin Alexey Golikov Eduard Tokar Vitaliy Mayorov Nina Didenko Dmitry Mashtalyar Tatiana Sokol’nitskaya Valentine Avramenko Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive Conditions Colloids and Interfaces H<sub>2</sub>-TPR seawater Sr-90 birnessite kinetic analysis cubic splines |
| title | Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive Conditions |
| title_full | Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive Conditions |
| title_fullStr | Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive Conditions |
| title_full_unstemmed | Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive Conditions |
| title_short | Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive Conditions |
| title_sort | morphological features and sorption performance of materials based on birnessite exposed to various reductive conditions |
| topic | H<sub>2</sub>-TPR seawater Sr-90 birnessite kinetic analysis cubic splines |
| url | https://www.mdpi.com/2504-5377/2/4/70 |
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