Permanganate transfer and reduction by D‐glucose in benzene–cetyltrimethylammoniumbromide aqueous solution: A kinetic study

Abstract

The addition of cationic surfactant, cetlytrimethylammoniumbromide (CTAB), in benzene and aqueous potassium permanganate solution brought the MnO − 4 from the aqueous phase to the organic phase. At 525 nm, the absorbance of the organic phase increased until it reached a maximum, and then decreased with [CTAB]. The effect of [CTAB] on the reduction of permanganate by D-glucose in a benzene-CTAB system has been studied spectrophotmetrically. The observed effect on the rate constant is catalytic up to a certain concentration of CTAB; thereafter, a saturation phenomenon is observed with an increased concentration of CTAB. The oxidation reaction obeyed the first-order kinetics with respect to the D-glucose. On addition of H 2 SO 4 , there was a decrease in the rate constants. There is evidence for the existence of manganese as a water-soluble colloidal MnO 2 . A detailed mechanism with the associated reaction kinetics is presented and discussed. C

Porous nano-MnO2: large scale synthesis via a facile quick-redox procedure and application in a supercapacitor

“…Generally, it is very difficult to study the exact reaction mechanism of permanganate oxidation to organic substrates due to the multitude of possible oxidation states. The acceptable reaction courses of the permanganate oxidation of D-glucose into MnO 2 are described as follows: [37][38][39][40] Mn(V) is highly unstable to the glucose-based radical and immediately gets converted into Mn(IV) [eqn (4)], and the formation of manganese dioxide can eventually occur in eqn (5). 40 The mechanism of sonochemical processes are usually based on the formation of the short-lived radical species H and OH [eqn (6)], generated during violent cavitation events.…”