Effect of Surfactants on Decoloration of Various Dyes by Peroxide Bleaching Agents

Abstract

The effect of three surfactants, dodecylbenzenesulfonate (DBS), n-hexadecyltrimethylammonium bromide (HTAB), and polyethylene glycol mono-p-octylphenyl ether (PEOPE), on the decoloration rates of C.I. Acid Orange 7, C.I. Basic Green 4, and C.I. Basic Orange 33 by peroxide bleaching agents such as sodium percarbonate and hydrogen peroxide is examined. The decoloration rate of Acid Orange 7 by peroxide bleaching agents accelerates in the presence of DBS, HTAB and PEOPE, especially near the cmc, with the maximum rate being observed in the presence of HTAB. However, the decoloration rate of Basic Orange 33 by hydrogen peroxide accelerates only when DBS is present near the cmc. There is no or less enhanced decoloration in the presence of HTAB or PEOPE. Interestingly, the decoloration rate of Basic Green 4 by hydrogen peroxide accelerates with increasing HTAB concentration, and in contrast, the rate decreases when DBS is present. These results indicate that decoloration rates by peroxide bleaching agents largely depend on interactions between the dyes and surfactants.

Peroxide decoloration of azo dyes catalyzed by manganese chlorophyll derivative in micellar solutions

“…In our previous study, the effect of various surfactants on the decoloration rate of azo dyes by hydrogen peroxide was examined under mild conditions of pH 7 or 8 and 25 C. 10 The decoloration rates were accelerated due to the presence of surfactants under mild conditions, especially near the critical micelle concentrations (CMCs). The maximum rate was observed in the presence of cationic surfactant, which depended on the interactions between the dyes and surfactants.…”

“…Acid Orange 7 by hydrogen peroxide were obtained in the presence and absence of the cationic surfactants with the different carbon numbers at various surfactant concentrations. 10,20,21 Figure 4 shows the plots of the rate constant versus surfactant concentration for each case. This figure shows the plots of the decoloration rates for C.I.…”

“…The result indicates that the decoloration rates depend on the electrostatic interaction between the dye (anion) and the hydrophilic part of the surfactant in a hydrophobic environment, and this result is consistent with that obtained in a previous study. 10 Mitsuishi et al 23 reported that the interactions between methyl orange anion and dodecyltrimethylammonium cation were interrupted because of the presence of sodium chloride. These results further indicate that in the presence of cationic surfactant, the decoloration rates depend on the electrostatic interaction between the dye and the surfactant.…”

“…In our previous papers, we reported the effect of various surfactants on the decoloration rate of azo dyes by hydrogen peroxide examined under mild conditions of pH 7 or 8 and 25 C. 10 The decoloration rates were accelerated due to the presence of surfactants under mild conditions, depending on interactions between the dyes and surfactants. Furthermore, we also reported the peroxide decoloration of azo dyes catalyzed by manganese porphyrins.…”

Decolorisation of azo dyes with hydrogen peroxide catalysed by manganese protoporphyrins

“…Recently, it has been demonstrated that surfactants and catalysts, such as metal complexes, activate peroxide bleaching under the milder conditions, of neutral pH and room temperature, than would be necessary for the use of peroxide alone. In our previous paper, the effect of various surfactants on the decolorisation rate of azo dyes by hydrogen peroxide was examined under mild condition, such as pH 7 or 8 and 25 °C [5]. The decolorisation rates were accelerated by the presence of surfactants under such mild conditions, depending on interactions between the dyes and surfactants.…”