Kinetics of brilliant green fading in the presence of TX-100, DTAB and SDS

The rate constant of alkaline fading of brilliant green (BG+) was measured in the presence of non ionic (TX-100), cationic (DTAB) and anionic (SDS) surfactants. This reaction was studied under pseudo first-order conditions at 283–303 K. The rate of reaction showed remarkable dependence on the electrical charge of the used surfactants. It was observed that the reaction rate constant increases in the presence of TX-100 and DTAB (catalytic effect) and decreases in the presence of SDS (inhibitory effect). Binding constants and the related thermodynamic parameters were obtained by the classical model. The results show that binding of BG+ to TX-100 is exothermic and binding of BG+ to DTAB and SDS is endothermic in the used concentration range of surfactants.