Abstract
DEGRADATION OF AQUEOUS SOLUTION OF THYMOL BLUE AND METHYL RED SEPARATELY AND AS ADMIXTURE USING ULTRASOUND
Anas Mouayed Al-Abachi, Eadaoin Joyce and Timothy Mason
The Sonochemistry Centre, Coventry University
CV1 5FB, Priory Street
Coventry (United Kingdom)
The degradation of aqueous solutions of Thymol blue and Methyl red were investigated. The loss of the colour in the dye solution was monitored using both static (aliquot technique) and flow spectrophotometry at 600 nm for Thymol Blue and 420 nm for Methyl Red in alkaline medium (pH = 10-11) and at a temperature of 24±10C. The effects of three ultrasonic frequencies: 40, 500 and 850 kHz on the degradation of Thymol Blue and Methyl Red in aqueous solution individually and in admixture were studied. The results revealed that both materials either individually or as a mixture were degraded much faster at the highest frequency of 850 kHz. The degradation of both materials followed pseudo first order kinetics and the rate constants using flow injection of 50µM of Thymol Blue and Methyl Red individually are 0.0095 and 0.0065 min-1 and in admixture 0.0035 and 0.0016 min-1 respectively. The results by static technique were different from these due to the change in volume of the aqueous solution under sonication. The effect of dye concentration on the rate constant has also been studied and it was found that the degradation of a single dye is faster than when the dye present in an admixture. In the admixture the degradation of Thymol Blue decreased when the concentration of Methyl Red was increased in solution and vice versa. Hydrogen peroxide and sodium chloride were found to enhance the degradation rate constant of both dyes. The degradations of both Thymol blue and Methyl red in canal water and reservoir water have also been investigated and found to be not substantially different from those in pure water. The analytical parameters of the flow system were evaluated.
Anas Mouayed Al-Abachi, Eadaoin Joyce and Timothy Mason
The Sonochemistry Centre, Coventry University
CV1 5FB, Priory Street
Coventry (United Kingdom)
The degradation of aqueous solutions of Thymol blue and Methyl red were investigated. The loss of the colour in the dye solution was monitored using both static (aliquot technique) and flow spectrophotometry at 600 nm for Thymol Blue and 420 nm for Methyl Red in alkaline medium (pH = 10-11) and at a temperature of 24±10C. The effects of three ultrasonic frequencies: 40, 500 and 850 kHz on the degradation of Thymol Blue and Methyl Red in aqueous solution individually and in admixture were studied. The results revealed that both materials either individually or as a mixture were degraded much faster at the highest frequency of 850 kHz. The degradation of both materials followed pseudo first order kinetics and the rate constants using flow injection of 50µM of Thymol Blue and Methyl Red individually are 0.0095 and 0.0065 min-1 and in admixture 0.0035 and 0.0016 min-1 respectively. The results by static technique were different from these due to the change in volume of the aqueous solution under sonication. The effect of dye concentration on the rate constant has also been studied and it was found that the degradation of a single dye is faster than when the dye present in an admixture. In the admixture the degradation of Thymol Blue decreased when the concentration of Methyl Red was increased in solution and vice versa. Hydrogen peroxide and sodium chloride were found to enhance the degradation rate constant of both dyes. The degradations of both Thymol blue and Methyl red in canal water and reservoir water have also been investigated and found to be not substantially different from those in pure water. The analytical parameters of the flow system were evaluated.
| Original language | English |
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| Publication status | Published - 5 Jun 2008 |
| Event | 11th Meeting of European Society of Sonochemistry - Montpellier, France, Grand La Motte, France Duration: 1 Jun 2008 → 5 Jun 2008 |
Conference
| Conference | 11th Meeting of European Society of Sonochemistry |
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| Country/Territory | France |
| City | Grand La Motte |
| Period | 1/06/08 → 5/06/08 |