Study On The Kinetics Of Alkaline Fading Of Crystal Violet In The Triton X-100 Aqueous Solutions And Microemulsions

In this thesis the kinetics of the alkaline fading of crystal violet (CV) in Triton X-100 aqueous solutions and Triton X-100/n-butanol/cyclohexane/water microemulsions were studied by UV-vis spectrophotometer. The effect of the structures of Triton X-100 micelles and Triton X-100/n-butanol/cyclohexane/water microemulsions on chemical reactions has been explored. The main content is the following:(1) The kinetics of alkaline fading of crystal violet (CV) in Triton X-100 aqueous solutions was studied at 298K. It has been found thatλ_max of Triton X-100 aqueous solutions shift from 591 nm to 600nm with the concentration of Triton X-100 up to 0.02012mol·L^-1, and the apparent second order rate constants k₂ of the alkaline fading of crystal violet increase with the concentration of Triton X-100. The first cmc and the second cmc have been determined and the effect of aggregates on the rate constants has been also discussed.(2) The conductivity of Triton X-100/n-butanol/cyclohexane/water microemulsions (TX-100: n-butanol=2:1, mass ratio) with different oil% (40%, 50%, 55%) has been measured. According to the conductivity measurement, the range of W/O, bicontinuous and O/W microemulsion and the transition points are determined.(3) The kinetics of alkaline fading of crystal violet (CV) in Triton X-100/ n-butanol/cyclohexane/water microemulsions with different oil% was studied at 298K. It has been found that the apparent second order rate constants k₂ of the alkaline fading of crystal violet increase along with the decrease ofωvalue and shows a minimum value near the transition point between W/O and bicontinuous microemulsion. The effect of structures and the transition points of microemulsions on rate constants have been discussed.