Photochemical Decomposition Of Rose Bengal Lab Report

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MELTING POINT: It’s melting point is approximately 300 °C. BOILING POINT: It’s boiling point is 757 °C at 760 mmHg DENSITY: Density of Rose Bengal is 2.88 g/cm3 VAPOR PRESSURE: It’s vapor pressure is 3.91E-24mmHg at 25 °C. REFRACTIVE INDEX: Refractive index of Rose Bengal is 1.916. MECHANISM OF DECOMPOSITION AND IT’S BY PRODUCT Photochemical decomposition of Rose Bengal is carried out in various ways. Here rose Bengal is decomposed using FE(III)-montmorillonite reductant. For the photo-chemical degradation of Bengal, sulphites like additives are being used, but in such circumstances, very less rate of degradation of Bengal is observed approximately about fifty percent. To control the mobilization or movement, adsorption of rose Bengal, in some aqua media or aqueous solution, iron based a mineral clay is being used for the degradation of Rose-Bengal. The rate of adsorption of Rose Bengal increases with increase in amount of Fe(III) Mt. Concentration of Rose Bengal dye was estimated through UV-V spectrophotometer at an absorbance of 545 nm. Complete decomposition of Rose Bengal was seen in acidic medium means in pH of five or may be 6, in the presence of Fe, time of decomposition occurred in 3 minutes only. At 7, pH or in basic medium, decomposition rate when measured was…show more content…
Under light by the excitation of triplet of riboflavin and the triplet of oxygen annihilation mechanism, a singlet oxygen which is derived from the triplet of oxygen plays an extremely important part in the photo-sensitized reactions. When the riboflavin molecule absorbs energy or light, it becomes excited. If singlet of riboflavin is excited it’s life will be 5 ns and if triplet of riboflavin is excited its life will be 1 ns. Photo reduction, photo addition is the type of reactions which are involved in photo-chemical degradation. these may be between molecules or within the molecule, it occurs rapidly and

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