title: Submicellar catalytic effect of cetyltrimethylammonium bromide in the oxidation of ethylenediaminetetraacetic acid by MnO4-.
abstract: The effects of cetyltrimethylammonium bromide (CTAB), sodiumdodecyl sulphate (SDS) and Triton X-100 (TX-100) on the oxidative degradation of ethylenediaminetetraacetic acid (EDTA) by MnO4(-) have been studied spectrophotometrically at 525 and 420 nm, respectively. It was found that cationic surfactant catalyse the reaction rate while anionic and non-ionic have no effect. The premicellar environment of CTAB strongly catalyses the reaction rate which may be due to the favorable electrostatic binding of both reactants (MnO4(-) and EDTA) with the positive head groups of the CTAB aggregates. The influence of different parameters such as [MnO4(-)], [EDTA], [H(+)] and [surfactants] were also considered. The reaction follows the first- and fractional-order kinetics with respect to [MnO4(-)] and [EDTA]. The proposed mechanism and the derived rate law are consistent with the observed kinetics.
authors.affiliation: Department of Chemistry, Jamia Millia Islamia Central University, Jamia Nagar, New Delhi 110025, India.
authors.forename: Maqsood Ahmad
authors.initials: MA
authors.lastname: Malik
authors.forename: Zaheer
authors.initials: Z
authors.lastname: Khan
mesh_terms: D002384:Catalysis; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000494:pharmacology*; D004492:Edetic Acid / Q000378:metabolism*; D007700:Kinetics; D017895:Manganese Compounds / Q000494:pharmacology*; D008823:Micelles; D010084:Oxidation-Reduction / Q000187:drug effects; D010087:Oxides / Q000494:pharmacology*; D012967:Sodium Dodecyl Sulfate
chemical_list: D002593:Cetrimonium Compounds; D017895:Manganese Compounds; D008823:Micelles; D010087:Oxides; C048856:permanganic acid; D012967:Sodium Dodecyl Sulfate; D004492:Edetic Acid; D000077286:Cetrimonium