5 research outputs found

    Thermodynamics of interaction of polyoxomolybdates with water soluble nonionic polymers

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    The static equilibrium isothermal sorption of dioxane, ethyl acetate, and methanol vapors by POM polyoxometalates with the structure of buckyball (Mo132, Mo72Fe30) and torus (Mo138), and also polymer-salt compositions containing POM were studied. The changes in the chemical potentials of the components and the Gibbs energy of the interaction of POMs, polymers, and compositions with low molecular weight liquids are calculated. The Gibbs energies and entropies of interaction of the components of the POM – polymer systems are estimated. The stability of the POM structure before and after sorption was investigated by IR spectroscopy. It was established that all investigated POMs exhibit the highest sorption capacity for dioxane, the lowest for ethyl acetate. Mo132 exhibits maximum affinity for sorbates, Mo72Fe30 exhibits a minimum affinity, and Mo138 occupies an intermediate position. It was established that PVP and PVA adsorb methanol in significantly larger quantities compared with compositions containing POM. The same rule is observed for PVP-POM systems in the case of dioxane. PVA practically does not absorb dioxane, but the introduction of POM in films of polyvinyl alcohol leads to the appearance of the sorption ability of the film. For all compositions a decrease in the Gibbs energy of the interaction of components and an increase in entropy were found, which can be associated with loosening and partial destruction of the crystal structure of the POM when polymer chains are introduced into it. The structure of polyoxomolybdates was found to be stable in dioxane vapors, and is also preserved in polymer-salt compositions before and after sorption.Π˜Π·ΡƒΡ‡Π΅Π½Π° статичСская равновСсная изотСрмичСская сорбция ΠΏΠ°Ρ€ΠΎΠ² диоксана, этилацСтата ΠΈ ΠΌΠ΅Ρ‚Π°Π½ΠΎΠ»Π° полиоксомСталлатами ПОМ со структурой Π±ΡƒΠΊΠΈΠ±ΠΎΠ»Π° (Mo132, Mo72Fe30) ΠΈ Ρ‚ΠΎΡ€Π° (Mo138), Π° Ρ‚Π°ΠΊΠΆΠ΅ ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ€Π½ΠΎ-солСвыми композициями, содСрТащими ПОМ. Рассчитаны измСнСния химичСских ΠΏΠΎΡ‚Π΅Π½Ρ†ΠΈΠ°Π»ΠΎΠ² ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚ΠΎΠ² ΠΈ энСргии Гиббса взаимодСйствия ПОМов, ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ€ΠΎΠ², ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ†ΠΈΠΉ с низкомолСкулярными Тидкостями. ΠžΡ†Π΅Π½Π΅Π½Ρ‹ энСргии Гиббса ΠΈ энтропии взаимодСйствия ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚ΠΎΠ² систСм ПОМ – ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ€. ΠœΠ΅Ρ‚ΠΎΠ΄Π°ΠΌΠΈ ИК- спСктроскопии исслСдована ΡΡ‚Π°Π±ΠΈΠ»ΡŒΠ½ΠΎΡΡ‚ΡŒ структуры ПОМ Π΄ΠΎ ΠΈ послС сорбции. УстановлСно, Ρ‡Ρ‚ΠΎ Π½Π°ΠΈΠ±ΠΎΠ»ΡŒΡˆΡƒΡŽ ΡΠΎΡ€Π±Ρ†ΠΈΠΎΠ½Π½ΡƒΡŽ ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡ‚ΡŒ всС исслСдованныС ПОМ ΠΏΡ€ΠΎΡΠ²Π»ΡΡŽΡ‚ ΠΊ диоксану, Π½Π°ΠΈΠΌΠ΅Π½ΡŒΡˆΡƒΡŽ – ΠΊ этилацСтату. МаксимальноС сродство ΠΊ сорбатам проявляСт Mo132, минимальноС – Mo72Fe30, Mo138 Π·Π°Π½ΠΈΠΌΠ°Π΅Ρ‚ ΠΏΡ€ΠΎΠΌΠ΅ΠΆΡƒΡ‚ΠΎΡ‡Π½ΠΎΠ΅ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅. УстановлСно, Ρ‡Ρ‚ΠΎ ΠŸΠ’ΠŸ ΠΈ ΠŸΠ’Π‘ ΡΠΎΡ€Π±ΠΈΡ€ΡƒΡŽΡ‚ ΠΌΠ΅Ρ‚Π°Π½ΠΎΠ» Π² сущСствСнно Π±ΠΎΠ»ΡŒΡˆΠΈΡ… количСствах ΠΏΠΎ ΡΡ€Π°Π²Π½Π΅Π½ΠΈΡŽ с композициями, содСрТащиС ПОМ. Вакая ΠΆΠ΅ Π·Π°ΠΊΠΎΠ½ΠΎΠΌΠ΅Ρ€Π½ΠΎΡΡ‚ΡŒ Π½Π°Π±Π»ΡŽΠ΄Π°Π΅Ρ‚ΡΡ для систСм ΠŸΠ’ΠŸ – ПОМ Π² случаС диоксана. ΠŸΠ’Π‘ практичСски Π½Π΅ ΠΏΠΎΠ³Π»ΠΎΡ‰Π°Π΅Ρ‚ диоксан, Π½ΠΎ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ ПОМ Π² ΠΏΠ»Π΅Π½ΠΊΠΈ ΠΏΠΎΠ»ΠΈΠ²ΠΈΠ½ΠΈΠ»ΠΎΠ²ΠΎΠ³ΠΎ спирта ΠΏΡ€ΠΈΠ²ΠΎΠ΄ΠΈΡ‚ ΠΊ возникновСнию сорбционной способности ΠΏΠ»Π΅Π½ΠΊΠΈ. Для всСх ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡ†ΠΈΠΉ ПОМ -ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ€ ΠΎΠ±Π½Π°Ρ€ΡƒΠΆΠ΅Π½ΠΎ ΡƒΠΌΠ΅Π½ΡŒΡˆΠ΅Π½ΠΈΠ΅ энСргии Гиббса взаимодСйствия ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚ΠΎΠ² ΠΈ возрастаниС энтропии, ΠΊΠΎΡ‚ΠΎΡ€ΠΎΠ΅ ΠΌΠΎΠΆΠ΅Ρ‚ Π±Ρ‹Ρ‚ΡŒ связно с Ρ€Π°Π·Ρ€Ρ‹Ρ…Π»Π΅Π½ΠΈΠ΅ΠΌ ΠΈ частичным Ρ€Π°Π·Ρ€ΡƒΡˆΠ΅Π½ΠΈΠ΅ΠΌ кристалличСской структуры ПОМ ΠΏΡ€ΠΈ Π²Π½Π΅Π΄Ρ€Π΅Π½ΠΈΠΈ Π² Π½Π΅Π΅ ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ€Π½Ρ‹Ρ… Ρ†Π΅ΠΏΠ΅ΠΉ. ΠžΠ±Π½Π°Ρ€ΡƒΠΆΠ΅Π½ΠΎ, Ρ‡Ρ‚ΠΎ структура полиоксомолибдатов ΡΡ‚Π°Π±ΠΈΠ»ΡŒΠ½Π° Π² ΠΏΠ°Ρ€Π°Ρ… диоксана, Π° Ρ‚Π°ΠΊΠΆΠ΅ сохраняСтся Π² ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ€Π½ΠΎ-солСвых композициях Π΄ΠΎ ΠΈ послС сорбции

    Erratum to: Interaction between Dioxane and Nanocluster Polyoxomolybdates and Their Composites Containing Water-Soluble Polymers (Russian Journal of Physical Chemistry A, (2020), 94, 4, (762-771), 10.1134/S0036024420040159)

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    Page 766, Table 1, limiting sorption values for methanol and acetone of Mo72Fe30 should read 6 and 2, respectively: Mo72Fe30 6/–1 0.5/–0.3 2/–0.5 3.5/–4 The original article can be found online at https://doi.org/10.1134/S0036024420040159. Β© 2020, Pleiades Publishing, Ltd

    Erratum to: Effect of Silver Nanoparticles on the Sorption Characteristics of La1Β βˆ’Β xAgxMnO3Β Β±Β y (Russian Journal of Physical Chemistry A, (2018), 92, 3, (516-521), 10.1134/S0036024418030214)

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    The indication of affiliation of the second author should read: a The original article can be found online at https://doi.org/10.1134/S0036024418030214. Β© 2019, Pleiades Publishing, Ltd
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