Micelle-assisted cerium(IV) oxidation of <Emphasis Type="SmallCaps">L</Emphasis>-sorbose in aqueous sulfuric acid |
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Authors: | Kabir-ud-Din Mohd Sajid Ali Zaheer Khan |
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Institution: | (1) Department of Chemistry, Aligarh Muslim University, Aligarh, 202 002, UP, India;(2) Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, New Delhi, 110 025, India |
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Abstract: | Spectrophotometric kinetic technique has been used to investigate the effect of cetyltrimethylammonium bromide (CTAB) and
sodium dodecyl sulfate (SDS) surfactants on the redox reaction of cerium(IV)+l-sorbose in aqueous sulfuric acid media. The anionic SDS has no effect, whereas the reaction rate increases in the presence
of cationic CTAB, which is due to favorable conditions provide by the cationic micelles. The reaction rate decreases with
H2SO4], and no acid-dependent path has been observed. At constant H2SO4], the rate of the reaction is dependent on the first powers of the l-sorbose and cerium(IV) concentrations. The CTAB-assisted reaction is retarded by addition of electrolytes (Na2SO4, NaNO3, and NaCl), which is attributed to the competition between electrolyte anions and cerium(IV)-sulfato species. Bromide ion
(of CTAB or externally added in the form of NaBr) is not oxidized by the cerium(IV) (as a main or side reaction). |
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Keywords: | Anionic surfactant Cationic surfactant l-Sorbose" target="_blank">l-Sorbose Oxidation Cerium(IV) Micelles Catalysis |
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