Micellar effect on the kinetics of oxidation of methyl blue by Ce(IV) in sulfuric acid medium
The kinetics of oxidation of methyl blue (MB) by Ce(IV) in aqueous and surfactant media has been carried out to explore the micellar effect on the rate and kinetic parameters of the reaction. The reaction was found to be first order with respect to both oxidant and substrate and fractional order wit...
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| Format: | Article |
| Language: | English |
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Elsevier
2015-01-01
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| Series: | Arabian Journal of Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535211000128 |
| _version_ | 1828483339098521600 |
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| author | Mohammed Hassan Mohammed D. AlAhmadi Majid Mosaid |
| author_facet | Mohammed Hassan Mohammed D. AlAhmadi Majid Mosaid |
| author_sort | Mohammed Hassan |
| collection | DOAJ |
| description | The kinetics of oxidation of methyl blue (MB) by Ce(IV) in aqueous and surfactant media has been carried out to explore the micellar effect on the rate and kinetic parameters of the reaction. The reaction was found to be first order with respect to both oxidant and substrate and fractional order with respect to H+. The active kinetic species of the oxidant was found to be Ce(SO4)+2 based on the effect of ionic strength and sulfate ion on the rate of the reaction. The presence of micelles was found to inhibit the reaction and this effect has been explained by the association of one of the reactants with the micelles leaving the other reactant in the bulk solution. The binding constant and first order rate constant in micellar medium has been obtained by the application of pseudo-phase model to the experimental data. Interestingly, the temperature dependence of the reaction reveals that the reaction has negative activation energy in the absence of micelles, which turns to a positive value in the presence of micelles. |
| first_indexed | 2024-12-11T08:34:37Z |
| format | Article |
| id | doaj.art-1df1283789104d249829f543b18a3219 |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-12-11T08:34:37Z |
| publishDate | 2015-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj.art-1df1283789104d249829f543b18a32192022-12-22T01:14:22ZengElsevierArabian Journal of Chemistry1878-53522015-01-0181727710.1016/j.arabjc.2011.01.008Micellar effect on the kinetics of oxidation of methyl blue by Ce(IV) in sulfuric acid mediumMohammed Hassan0Mohammed D. AlAhmadi1Majid Mosaid2Department of Chemistry, Faculty of Science, Ibb University, Ibb 70270, YemenDepartment of Chemistry, Faculty of Education, Aden University, Aden, YemenDepartment of Chemistry, Faculty of Science, Ibb University, Ibb 70270, YemenThe kinetics of oxidation of methyl blue (MB) by Ce(IV) in aqueous and surfactant media has been carried out to explore the micellar effect on the rate and kinetic parameters of the reaction. The reaction was found to be first order with respect to both oxidant and substrate and fractional order with respect to H+. The active kinetic species of the oxidant was found to be Ce(SO4)+2 based on the effect of ionic strength and sulfate ion on the rate of the reaction. The presence of micelles was found to inhibit the reaction and this effect has been explained by the association of one of the reactants with the micelles leaving the other reactant in the bulk solution. The binding constant and first order rate constant in micellar medium has been obtained by the application of pseudo-phase model to the experimental data. Interestingly, the temperature dependence of the reaction reveals that the reaction has negative activation energy in the absence of micelles, which turns to a positive value in the presence of micelles.http://www.sciencedirect.com/science/article/pii/S1878535211000128Methyl blueOxidationCe(IV)Micellar effectNegative activation energy |
| spellingShingle | Mohammed Hassan Mohammed D. AlAhmadi Majid Mosaid Micellar effect on the kinetics of oxidation of methyl blue by Ce(IV) in sulfuric acid medium Arabian Journal of Chemistry Methyl blue Oxidation Ce(IV) Micellar effect Negative activation energy |
| title | Micellar effect on the kinetics of oxidation of methyl blue by Ce(IV) in sulfuric acid medium |
| title_full | Micellar effect on the kinetics of oxidation of methyl blue by Ce(IV) in sulfuric acid medium |
| title_fullStr | Micellar effect on the kinetics of oxidation of methyl blue by Ce(IV) in sulfuric acid medium |
| title_full_unstemmed | Micellar effect on the kinetics of oxidation of methyl blue by Ce(IV) in sulfuric acid medium |
| title_short | Micellar effect on the kinetics of oxidation of methyl blue by Ce(IV) in sulfuric acid medium |
| title_sort | micellar effect on the kinetics of oxidation of methyl blue by ce iv in sulfuric acid medium |
| topic | Methyl blue Oxidation Ce(IV) Micellar effect Negative activation energy |
| url | http://www.sciencedirect.com/science/article/pii/S1878535211000128 |
| work_keys_str_mv | AT mohammedhassan micellareffectonthekineticsofoxidationofmethylbluebyceivinsulfuricacidmedium AT mohammeddalahmadi micellareffectonthekineticsofoxidationofmethylbluebyceivinsulfuricacidmedium AT majidmosaid micellareffectonthekineticsofoxidationofmethylbluebyceivinsulfuricacidmedium |