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Kinetics and Mechanism of Oxidation of Alizarin Red-S Using Chloramine-T in Acid Medium Asha.P.K, 1,2 Padma Narayanamurthy and 2M.S

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Kinetics and Mechanism of Oxidation of Alizarin Red-S Using Chloramine-T in Acid Medium Asha.P.K, 1,2 Padma Narayanamurthy and 2M.S International Journal of Trend in Research and Development, Volume 3(3), ISSN: 2394-9333 www.ijtrd.com Kinetics and Mechanism of Oxidation of Alizarin Red-S Using Chloramine-T in Acid Medium Asha.P.K, 1,2 Padma Narayanamurthy and 2M.S. Kavya, 1Department of Chemistry, New Horizon College of Engineering, Bangalore-560103, India 2Research Scholar, VTU, Belgaum, India Abstract-- Kinetics of the oxidation of 1,2 sodium chloride. A detailed review of the chemistry of CAT dihydroxyanthraquinone, mordant vegetable dye (ALZ) byN- and related N-haloarylsulfonamides has been reported [9]. It chloro-p-toluenesulfonoamide (CAT) in per chloric acid can behave as both electrophiles and nucleophiles depending medium at 28oC was studied spectrophotometrically. The on reaction conditions [10]. reaction showed first order dependence on both [substrate] Chloramine-T (CAT), a by-product in saccharin manufacture, and [oxidant]. The reaction failed to initiate the is well-known as an analytical reagent, and the mechanistic polymerization of added acrylonitrile and this erase the aspects of its reactions have been well-documented [11-13]. involvement of radical intermediate in the reaction. A mechanism is proposed to account for the kinetic data II. EXPERIMENTAL obtained. The method adopted for the oxidation of mordant dye in the present work offers several advantages and can be A. Materials and Methods scaled up to dye industries and for various dye fabrication All the reagents were of analytical reagent grade and all the processes. solutions were prepared in doubly distilled water and CO2 free deionized water. A solution of alizarin, 10x10-3mol/dm3was Key words-- Kinetics of oxidation, Alizarin, Chloramine-T prepared by dissolving 0.3642g of alizarin in water, and the I. INTRODUCTION solution was diluted to the mark in100cm3 volumetric flask. Chloramine-T was prepared [14] by passing chlorine through Alizarin or 1, 2-dihydroxyanthraquinone also known as a solution of benzenesulphonamide in 4mol/dm3 NaOH for an Mordant red and Turkey Red[1] is an organic compound with hour. The product was collected, dried and recrystallized from molecular formula C H O that has been historically used as 14 8 4 water (m.p. 167oC). Its purity was checked by iodometry for an prominent dye mainly for dyeing textile fabrics. Naturally, its active chlorine content and also by its 1H and 13C-NMR it is derived from the roots of madder genus [2] plants. spectra. An aqueous solution of CAT was standardized O iodometrically. Both the solutions of Alizarin and CAT were stored in dark glass bottles to prevent the OH photochemicaldeterioration of the reagents. Perchloric acid (E. Merck) was prepared in double distilled water, without OH any further purification. Absorbance was recorded on UV-VIS Spectrophotometer at wavelength525nm[15]. O Figure 1: Structure of Alizarin (Molecular mass: 364.24) B. Kinetic measurements Alizarin (madder) has been used in textile dyeing since early In the present study, the kinetics of the reaction was carried antiquity. And it is the first dye which has been synthesized in out at room temperature 25oC. Kinetic runs were performed laboratory and is now finding usage in painting industry. under pseudo first-order conditions with a known excess of Alizarin is used in medical studies in bone growth, bone [CAT]o over [ALZ]o. The kinetics of oxidation of Alizarin by marrow, osteoporosis, tissue engineering and also in CAT was investigated at several initial concentrations of the geological studies in the determination of calcium content. reactants in acid media.The reaction was initiated by mixing A method for the synthesis of alizarin was first discovered the ALZ to CAT solution, which has been diluted to a (1868) by Karl Graebe and Karl Liebermann, German constant volume, and the progress of the reaction was followed spectrophotometrically at 525nm by monitoring the chemists.(λmax=525nm) With salts of metals, the compound forms brilliant lakes, although by itself it is a poor dye. decrease in absorbance due to CAT. Turkey red is produced with an aluminum mordant, other The pseudo first order rate constant, „kobs‟ were determined shades of red with calcium and tin salts, dark violet with iron from log (Do/Dt) vs time plots. The plots were linear up to mordants, and brownish red with chromium. Purpurin, also 85% completion of reaction under the neutral media. The used in dyeing, occurs with alizarin in madder and is produced orders for various species were determined from slopes of synthetically. plots of logkobs vs respective concentration of species. The oxidant selected in our oxidation study is Chloramine-T. Considerable attention has centered around the chemistry of III. RESULTS AND DISCUSSION N-metallo-N-arylhalosulphonamides, generally known as 3.1 The figure (1) shows the plot of log(Do/Dt) Vs time at organic haloamines, because of their versatility, and their 297K. The observed rate kobs were calculated from the slopes behavior as an oxidizing agent in both acidic and alkaline of the straight lines by linear regression. The electron transfer media [3]. It is an important oxidizing agent and has shown a reaction between [ALZ] and [CAT] has been studied over the variety of kinetic results due to formation of its various range of 5x10-4 to 25x10-4 and 1.25 x10-3 to 7.5x 10- 3mol/dm3 oxidizing species depending upon pH of the medium[4- respectively. The observed rate constant, log kobs were plotted 8].Generally, CAT undergoes a two-electron change in its against log concentration.The values of pseudo first-order rate reactions resulting in the formation of the reaction product, p- constants, k‟ remained unaltered with variation of log[ALZ]o toluenesulphonamide or PTS (p-CH3C6H4SO2NH2) and confirming the first-order dependence on [ALZ]. IJTRD | May-Jun 2016 Available [email protected] 374 International Journal of Trend in Research and Development, Volume 3(3), ISSN: 2394-9333 www.ijtrd.com Plots of logk‟ Vs log[CAT] whose(r= 0.9435) with unit slope Table: 1 showing first-order dependence on the rate of [CAT]. -4 -3 - [ALZ]x10 mol/dm [CAT]x10 kobs 3mol/d m-3 0.4 5 5 0.0270 0.35 10 5 0.0248 0.3 15 5 0.0217 20 5 0.0129 0.25 25 5 0.0057 0.2 5 1.25 0.0066 5 2.5 0.0187 log Do/Dt log 0.15 5 5 0.0277 0.1 5 6.25 0.0423 0.05 5 7.5 0.0367 0 0 10 20 30 40 50 Time in minutes Chloramine-T acts as an oxidizing agent in both acidic and Figure 2: Plot of log(Do/Dt) Vs time in minutes. alkaline medium. It undergoes a two-electron change in its 2.2 Effect of variation of Alizarin concentration. The reactions. As said, the reduction potential of CAT is pH concentration of alizarin was varied from 5x10-4 to 25x10-4 dependent [16] and decreases with an increase in pH of the mol/dm3 at fixed concentration of other reactants. A plot of medium. Depending on the pH of the medium, CAT furnishes initial rates Vs [ALZ] showed first-order dependence with the different types of reactive species in the solution. [17-19] reductant(Figure: 2). The constant value of k(Table: 1) TsNClNa TsNCl- + Na+ indicate the unit order with respect to Alizarin. TsNCl- + H+ TsNHCl 0 2TsNHCl -4 -3 -2 -1 -0.5 0 1 TsNH2 + TsNCl2 -1 TsNH + HOCl -1.5 TsNHCl + H2O 2 -2 TsNCl + H O TsNHCl + HOCl -2.5 2 2 log kobslog -3 HOCl H+ + OCl- -3.5 + + -4 HOCl + H H O Cl 2 -4.5 Therefore, the probable reactive species in acid solution of log C + CAT are TsNHCl, TsNCl2, HOCl and H2O Cl. Under the present experimental conditions, the effective oxidizing Figure 3: Graph to study the variation of reductant on the species may be TsNHCl. reaction rate O O 2.2 Effect of variation of CAT concentration. The OH OH -3 -3 HO concentration of CAT was varied from 1.25 x10 to 7.5x 10 CAT mol/dm-3at fixed concentration of other reactants. A plot of + OH + OH initial rates versus concentration of CAT shows a unit order OH dependence with oxidant.(Figure: 3) O O 1 CONCLUSION 0.5 Development in science and technology leads to vast growth of industries and factories. Many industries use dyes for 0 various purposes like pigmentation, colouring products. Paper, -4 -3 -2 -1 0 1 -0.5 food, cosmetics and textile industrial unit frequently produce coloured residual effluents, which are undergone treatment -1 before passing into water sources. The presence of dyes and log kobslog industrial dyestuffs in water even in ppm level causes -1.5 disturbance for aquatic life. The present redox system can be adopted for treating Alizarin dye present in industrial effluents -2 with suitable modifications to reduce the toxicity caused by log C -2.5 alizarin through decoloration. The study could also be used in medical and geological studies. Figure 4: Graph to study the variation of oxidant on the reaction rate. IJTRD | May-Jun 2016 Available [email protected] 375 International Journal of Trend in Research and Development, Volume 3(3), ISSN: 2394-9333 www.ijtrd.com References [10] Campbell M M and Johnson G 1978 Chem. Rev. 78 65 [11] Mahadevappa D S, Ananda S Murthy A S A and [1] SigmaAldrich Catalog: Alizarin Vankar P S, Shanker R, Rangappa K S 1984 Tetrahedron 10 1673 Mahanta D, Tiwar SC, “Ecofriendly Sonicator Dyeing of [12] Banerji K K, Jayaram B and Mahadevappa D S 1987 Cotton with Rubia cordifolia Linn. Using Biomordant". J.Sci. Ind.
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