Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor
In a previous paper, adsorption isotherms of benzene vapor on natural bentonite from Ginovci, Macedonia, and forms acid activated with 10% and 15% solutions of hydrochloric were interpreted by means of the Dubinin-Radushkevich-Stoeckli and Dubinin-Astakhov equations; the investigation has been conti...
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doaj-13ed2449f6e34eb0be95f518f49461132020-12-24T14:27:54ZengSerbian Chemical Society Journal of the Serbian Chemical Society0352-51391820-74212005-01-01701334010.2298/JSC0501033B0352-51390501033BAdsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vaporBrezovska Snežana S.0Marina Biljana1Burevski Dončo K.2Angjuševa Biljana I.3Bosevska Vasa4Stojanovska Lepa5St. Kiril and Metodij University - Faculty of Technology and Metallurgy, Skopje, R. MacedoniaSt. Kiril and Metodij University - Faculty of Technology and Metallurgy, Skopje, R. MacedoniaSt. Kiril and Metodij University - Faculty of Technology and Metallurgy, Skopje, R. MacedoniaSt. Kiril and Metodij University - Faculty of Technology and Metallurgy, Skopje, R. MacedoniaSt. Kiril and Metodij University - Faculty of Technology and Metallurgy, Skopje, R. MacedoniaSt. Kiril and Metodij University - Faculty of Technology and Metallurgy, Skopje, R. MacedoniaIn a previous paper, adsorption isotherms of benzene vapor on natural bentonite from Ginovci, Macedonia, and forms acid activated with 10% and 15% solutions of hydrochloric were interpreted by means of the Dubinin-Radushkevich-Stoeckli and Dubinin-Astakhov equations; the investigation has been continued with bentonites acid activated with 10% and 15% solutions of sulfuric acid where X-ray analysis indicates smaller structural changes. Using the above equations, the heterogeneity of the micropores and the energetic heterogeneity of the bentonites were determined from the differential distribution of the micropore volume with respect to the structural parameter of the equations characterizing the microporous structure and to the molar free energy of adsorption. Activated bentonites obtain bigger pores but also a certain quantity of new small pores appear during acid activation with the higher concentration of acid. The micropore volumes, determined from the adsorption of benzene vapor, of bentonites activated with 10 % and 15 % solution of hydrochloric acid (144.60 cm3 kg-1 and 110.06 cm3 kg-1, respectively), decrease in comparison with that of natural bentonite (162.55 cm3 kg-1). In contrast, the values of the micropore volume for bentonities treated with 10 % and 15 % solutions of sulfuric acids increase (169.19 cm3 kg-1 and 227.74 cm3 kg-1). That is due to the difference in the structural changes occurring during activation with hydrochloric and sulfuric acids. The values of the free energy of adsorption of benzene vapor for natural bentonite are higher than those of the acid activated bentonities, what is in accordance with the structural and porosity changes.http://www.doiserbia.nb.rs/img/doi/0352-5139/2005/0352-51390501033B.pdfadsorptionbenzenebentonitechemical activationdubinin-radushkevich-stoeckli and dubinin-astakhov equations |
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language |
English |
format |
Article |
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DOAJ |
author |
Brezovska Snežana S. Marina Biljana Burevski Dončo K. Angjuševa Biljana I. Bosevska Vasa Stojanovska Lepa |
spellingShingle |
Brezovska Snežana S. Marina Biljana Burevski Dončo K. Angjuševa Biljana I. Bosevska Vasa Stojanovska Lepa Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor Journal of the Serbian Chemical Society adsorption benzene bentonite chemical activation dubinin-radushkevich-stoeckli and dubinin-astakhov equations |
author_facet |
Brezovska Snežana S. Marina Biljana Burevski Dončo K. Angjuševa Biljana I. Bosevska Vasa Stojanovska Lepa |
author_sort |
Brezovska Snežana S. |
title |
Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor |
title_short |
Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor |
title_full |
Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor |
title_fullStr |
Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor |
title_full_unstemmed |
Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor |
title_sort |
adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor |
publisher |
Serbian Chemical Society |
series |
Journal of the Serbian Chemical Society |
issn |
0352-5139 1820-7421 |
publishDate |
2005-01-01 |
description |
In a previous paper, adsorption isotherms of benzene vapor on natural bentonite from Ginovci, Macedonia, and forms acid activated with 10% and 15% solutions of hydrochloric were interpreted by means of the Dubinin-Radushkevich-Stoeckli and Dubinin-Astakhov equations; the investigation has been continued with bentonites acid activated with 10% and 15% solutions of sulfuric acid where X-ray analysis indicates smaller structural changes. Using the above equations, the heterogeneity of the micropores and the energetic heterogeneity of the bentonites were determined from the differential distribution of the micropore volume with respect to the structural parameter of the equations characterizing the microporous structure and to the molar free energy of adsorption. Activated bentonites obtain bigger pores but also a certain quantity of new small pores appear during acid activation with the higher concentration of acid. The micropore volumes, determined from the adsorption of benzene vapor, of bentonites activated with 10 % and 15 % solution of hydrochloric acid (144.60 cm3 kg-1 and 110.06 cm3 kg-1, respectively), decrease in comparison with that of natural bentonite (162.55 cm3 kg-1). In contrast, the values of the micropore volume for bentonities treated with 10 % and 15 % solutions of sulfuric acids increase (169.19 cm3 kg-1 and 227.74 cm3 kg-1). That is due to the difference in the structural changes occurring during activation with hydrochloric and sulfuric acids. The values of the free energy of adsorption of benzene vapor for natural bentonite are higher than those of the acid activated bentonities, what is in accordance with the structural and porosity changes. |
topic |
adsorption benzene bentonite chemical activation dubinin-radushkevich-stoeckli and dubinin-astakhov equations |
url |
http://www.doiserbia.nb.rs/img/doi/0352-5139/2005/0352-51390501033B.pdf |
work_keys_str_mv |
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