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Effect of surfactant micelles on the kinetics of oxidation of D ‐fructose by cerium(IV) in sulfuric acid medium
Author(s) -
Ali Mohd. Sajid,
Khan Zaheer
Publication year - 2006
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20132
Subject(s) - chemistry , micelle , kinetics , sodium dodecyl sulfate , bromide , inorganic chemistry , cerium , arrhenius equation , sulfuric acid , pulmonary surfactant , reaction rate constant , catalysis , fructose , nuclear chemistry , chromatography , organic chemistry , activation energy , biochemistry , aqueous solution , physics , quantum mechanics
Abstract Kinetics of the oxidation of D ‐fructose by cerium(IV) has been investigated both in the absence and presence of surfactants (cetyltrimethylammonium bromide, CTAB, and sodium dodecyl sulfate, SDS) in sulfuric acid medium. The reaction exhibits first‐order kinetics each in [cerium(IV)] and[ D ‐fructose] and inverse first order in [H 2 SO 4 ]. The Arrhenius equation is found to be valid for the reaction between 30–50°C. A detailed mechanism with the associated reaction kinetics is presented and discussed. While SDS has no effect, CTAB increases the reaction rate with the same kinetic behavior in its presence. The catalytic role of CTAB micelles is discussed in terms of the pseudophase model proposed by Menger and Portnoy. The association constant K s that equals to 286 mol −1 dm 3 is found for the association of cerium(IV) with the positive head group of CTAB micelles. The effect of inorganic electrolytes (Na 2 SO 4 , NaNO 3 , NaCl) has also been studied and discussed. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 38: 18–25, 2006