Author: Soma Das, Amiyaa Mandal and P.K. Pradhan
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Crystal violet (CV) and Malachite Green (MG) both are synthetic triphenylmethane dyes and generally basic (cationic) in nature. These are widely used in clothing industry, leather industry and for dyeing many substances. MG & CV can also use as antibacterial, antifungal and anthelmintic agents. Direct contacts of dyes are very much injurious to animal kingdom. Hence, they have become pertinent to find and efficient way to remove it from environment. The kinetics of alkaline hydrolysis of Crystal Violet (CV) and Malachite Gree (MG) in presence of different salt was studied. Reductions were carried out by varying dye concentration, salt concentration and concentration of alkali. In the present study the reduction of dye was carried out in order to reduce the color content. This research work tends to explore salt effect on alkaline hydrolysis of these dyes with focus on kinetics of the reaction. This process can, therefore, be used as technical solutions for the treatment of dye by reducing its colour content for different approaches.
Crystal violet (CV), Malachite green (MG), Hydroxylation, Salt effect
The present research work shows that the reaction mechanism of hydrolysis of MG and similar to that of hydrolysis of CV in alkaline medium. It is observed that 0.001% MG solution (solution made in 1:4 ethanol: water) is completely decolourised at 20 days (shown in Fig. 11) but it was reported that due to high stability of solution, CV takes infinite time for decolourisation. Some difference in reaction rate and kinetics is attributed for the structural difference of two dyes. More mechanistic studies on salt effect on hydroxylation of other organic dyes, their comparative studies and surface adsorbent effect are also our ongoing research. The present study offers new perspectives for exploring the potentials of these dyes to study the chemical kinetics and also toxicological properties.
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