Adsorption of <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium
The work considers for the first time the preparation of sorbents based on hypercrosslinked polysterene (HCP) and chelating agent <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetraoctyl diglycolamide (TODGA) by impregnation in the supercritical (SC) CO<sub...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/27/1/31 |
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| author | Mikhail Kostenko Olga Parenago |
| author_facet | Mikhail Kostenko Olga Parenago |
| author_sort | Mikhail Kostenko |
| collection | DOAJ |
| description | The work considers for the first time the preparation of sorbents based on hypercrosslinked polysterene (HCP) and chelating agent <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetraoctyl diglycolamide (TODGA) by impregnation in the supercritical (SC) CO<sub>2</sub> medium. Such sorbents can be applied for further isolation and separation of lanthanides, actinides and other metals. They are usually prepared by impregnation in toxic organic solvents (e.g., methanol, dichloromethane). Our study shows that application of SC CO<sub>2</sub> instead of organic solvents can significantly speed up the impregnation, perfom it in one stage and make the process more eco-friendly. At the same time, the obtained sorbents are close in their parameters to the classical ones. This article presents the results of measuring the TODGA adsorption isotherms on two HCP sorbents (MN202 and MN270) on a wide range of SC fluid parameters. Adsorption measurements were carried out using on-line supercritical fluid chromatography and gravimetry. Based on the sorption capacity parameter, MN202 sorbent was selected as the better carrier for TODGA. An impregnation temperature increase within the range 313–343 K in isochoric conditions (ρ = 0.780 g/mL) reduces the maximum of TODGA adsorption from ~0.68 mmol/g to ~0.49 mmol/g. |
| first_indexed | 2024-03-10T03:32:15Z |
| format | Article |
| id | doaj.art-ce0c53d367b64f8a8204f01497f7e646 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T03:32:15Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-ce0c53d367b64f8a8204f01497f7e6462023-11-23T11:55:37ZengMDPI AGMolecules1420-30492021-12-012713110.3390/molecules27010031Adsorption of <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide MediumMikhail Kostenko0Olga Parenago1Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Prospect 31, 119071 Moscow, RussiaKurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Prospect 31, 119071 Moscow, RussiaThe work considers for the first time the preparation of sorbents based on hypercrosslinked polysterene (HCP) and chelating agent <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetraoctyl diglycolamide (TODGA) by impregnation in the supercritical (SC) CO<sub>2</sub> medium. Such sorbents can be applied for further isolation and separation of lanthanides, actinides and other metals. They are usually prepared by impregnation in toxic organic solvents (e.g., methanol, dichloromethane). Our study shows that application of SC CO<sub>2</sub> instead of organic solvents can significantly speed up the impregnation, perfom it in one stage and make the process more eco-friendly. At the same time, the obtained sorbents are close in their parameters to the classical ones. This article presents the results of measuring the TODGA adsorption isotherms on two HCP sorbents (MN202 and MN270) on a wide range of SC fluid parameters. Adsorption measurements were carried out using on-line supercritical fluid chromatography and gravimetry. Based on the sorption capacity parameter, MN202 sorbent was selected as the better carrier for TODGA. An impregnation temperature increase within the range 313–343 K in isochoric conditions (ρ = 0.780 g/mL) reduces the maximum of TODGA adsorption from ~0.68 mmol/g to ~0.49 mmol/g.https://www.mdpi.com/1420-3049/27/1/31adsorption<i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetraoctyl diglycolamidehypercrosslinked polystyrenesupercritical fluidchromatographygravimetry |
| spellingShingle | Mikhail Kostenko Olga Parenago Adsorption of <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium Molecules adsorption <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetraoctyl diglycolamide hypercrosslinked polystyrene supercritical fluid chromatography gravimetry |
| title | Adsorption of <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium |
| title_full | Adsorption of <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium |
| title_fullStr | Adsorption of <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium |
| title_full_unstemmed | Adsorption of <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium |
| title_short | Adsorption of <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetraoctyl Diglycolamide on Hypercrosslinked Polysterene from a Supercritical Carbon Dioxide Medium |
| title_sort | adsorption of i n i i n i i n i i n i tetraoctyl diglycolamide on hypercrosslinked polysterene from a supercritical carbon dioxide medium |
| topic | adsorption <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetraoctyl diglycolamide hypercrosslinked polystyrene supercritical fluid chromatography gravimetry |
| url | https://www.mdpi.com/1420-3049/27/1/31 |
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