Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis

Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis

By spectrophotometric and kinetic methods of analysis a study has been made of adsorption of three antidotes of the phenothiazine series on the surface of fumed silica from water solutions. Physical and chemical parameters of adsorption have been calculated. Thermal decomposition of bulk antidotes h...

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Бібліографічні деталі
Дата:2002
Автори: Kulik, T.V., Galagan, N.P., Pokrovskiy, V.A., Khrapak, V.V.
Формат: Стаття
Мова:English
Опубліковано: Інститут хімії поверхні ім. О.О. Чуйка НАН України 2002
Назва видання:Поверхность
Теми:
Surface chemistry of silica and related sorbents
Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/126351
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Цитувати:Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis / T.V. Kulik, N.P. Galagan, V.A. Pokrovskiy, V.V. Khrapak // Поверхность. — 2002. — Вип. 7-8. — С. 46-56. — Бібліогр.: 8 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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spelling irk-123456789-1263512017-11-21T03:02:42Z Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis Kulik, T.V. Galagan, N.P. Pokrovskiy, V.A. Khrapak, V.V. Surface chemistry of silica and related sorbents By spectrophotometric and kinetic methods of analysis a study has been made of adsorption of three antidotes of the phenothiazine series on the surface of fumed silica from water solutions. Physical and chemical parameters of adsorption have been calculated. Thermal decomposition of bulk antidotes has been investigated by the temperatureprogrammed desorption technique with the mass-spectrometric registration of volatile constituents (TPD MS) and the results achieved were compared with data for adsorbed samples. For all the samples at the first stage the maximum of HCl evolution is observed at 180°C. For methylene blue and toluidinee dark blue the first stage is accompanied by evolution of CH3Cl (m/z 50). Then the decomposition proceeds through the rupture of thiazine rings. At this stage, at the temperature of maximum 240°C and higher in mass spectra there appear lines at m/z 93, 66, 51 corresponding to molecular decomposition of aniline. Besides, sulfur-containing fragments originating from rupture of thiazine rings (lines at m/z 32, 34, 107, 121, 135) are observed among the lines attributed to products of thermal decomposition of methylene blue and toluidinee dark blue at high temperatures. Comparison of TPD MS experimental data about thermal decomposition of the antidotes in the condensed and adsorbed states has shown that adsorption on highly dispersed silica surface changed dramatically the mechanism of thermal transformations and increased thermal stability of antidote molecules in comparison to that in the condensed state. 2002 Article Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis / T.V. Kulik, N.P. Galagan, V.A. Pokrovskiy, V.V. Khrapak // Поверхность. — 2002. — Вип. 7-8. — С. 46-56. — Бібліогр.: 8 назв. — англ. XXXX-0106 http://dspace.nbuv.gov.ua/handle/123456789/126351 en Поверхность Інститут хімії поверхні ім. О.О. Чуйка НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic Surface chemistry of silica and related sorbents
Surface chemistry of silica and related sorbents
spellingShingle Surface chemistry of silica and related sorbents
Surface chemistry of silica and related sorbents
Kulik, T.V.
Galagan, N.P.
Pokrovskiy, V.A.
Khrapak, V.V.
Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis
Поверхность
description By spectrophotometric and kinetic methods of analysis a study has been made of adsorption of three antidotes of the phenothiazine series on the surface of fumed silica from water solutions. Physical and chemical parameters of adsorption have been calculated. Thermal decomposition of bulk antidotes has been investigated by the temperatureprogrammed desorption technique with the mass-spectrometric registration of volatile constituents (TPD MS) and the results achieved were compared with data for adsorbed samples. For all the samples at the first stage the maximum of HCl evolution is observed at 180°C. For methylene blue and toluidinee dark blue the first stage is accompanied by evolution of CH3Cl (m/z 50). Then the decomposition proceeds through the rupture of thiazine rings. At this stage, at the temperature of maximum 240°C and higher in mass spectra there appear lines at m/z 93, 66, 51 corresponding to molecular decomposition of aniline. Besides, sulfur-containing fragments originating from rupture of thiazine rings (lines at m/z 32, 34, 107, 121, 135) are observed among the lines attributed to products of thermal decomposition of methylene blue and toluidinee dark blue at high temperatures. Comparison of TPD MS experimental data about thermal decomposition of the antidotes in the condensed and adsorbed states has shown that adsorption on highly dispersed silica surface changed dramatically the mechanism of thermal transformations and increased thermal stability of antidote molecules in comparison to that in the condensed state.
format Article
author Kulik, T.V.
Galagan, N.P.
Pokrovskiy, V.A.
Khrapak, V.V.
author_facet Kulik, T.V.
Galagan, N.P.
Pokrovskiy, V.A.
Khrapak, V.V.
author_sort Kulik, T.V.
title Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis
title_short Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis
title_full Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis
title_fullStr Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis
title_full_unstemmed Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis
title_sort studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis
publisher Інститут хімії поверхні ім. О.О. Чуйка НАН України
publishDate 2002
topic_facet Surface chemistry of silica and related sorbents
url http://dspace.nbuv.gov.ua/handle/123456789/126351
citation_txt Studies of adsorbed phenothiazine antidotes by temperature-programmed desorption with mass-spectrometric analysis / T.V. Kulik, N.P. Galagan, V.A. Pokrovskiy, V.V. Khrapak // Поверхность. — 2002. — Вип. 7-8. — С. 46-56. — Бібліогр.: 8 назв. — англ.
series Поверхность
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AT pokrovskiyva studiesofadsorbedphenothiazineantidotesbytemperatureprogrammeddesorptionwithmassspectrometricanalysis
AT khrapakvv studiesofadsorbedphenothiazineantidotesbytemperatureprogrammeddesorptionwithmassspectrometricanalysis
first_indexed 2023-10-18T20:50:37Z
last_indexed 2023-10-18T20:50:37Z
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