Advanced oxidation processes (AOPs)

Advanced oxidation processes (AOPs) have proved very effective in treatment of the various hazardous organic
pollutants in water. The photochemical decolorization of three dyes, namely Acid Orange 8 (AO8), Acid Blue 74
(AB74) and Methyl Orange (MO) was studied in the UV/hydrogen peroxide process by using a continuous photochemical
reactor with a 15 W low pressure mercury lamp. Decolorization was complete in relatively short time and
follows apparent first order kinetics with respect of dye concentration. The rate of disappearance of a given dye was
monitored spectrophotometrically at the visible maximum absorption wavelength. It was found that the rate of decolorization
rises by increasing the initial dosage of H2O2 up to a ‘‘critical’’ value at which it is maximum and beyond
which it is inhibited. A simple reactions pathway, describing adequately the process, has been studied. Based on this
reaction schema, we have established a mathematical relation between the apparent rate constant of the dye removal
and applied H2O2 dosage presented by the ratio of its initial mass concentration to that of the dye. The rate constant
values obtained by model for the three dye solutions are in good agreement with the experimental data. The model
parameters have been determined.

Results (English) 2:

Advanced oxidation processes (aops) have proved very effective in the Treatment of Various Organic hazardous
pollutants in Water. The photochemical Decolorization of Three dyes, namely Acid Orange 8 (AO8), Acid Blue 74
(AB74) and Methyl Orange (MO) was studied in the UV / hydrogen peroxide Process by using a continuous photochemical
Reactor with a 15 W low pressure Mercury Lamp. . Complete Decolorization was in relatively short time and
follows First Order Kinetics with respect apparent concentration of dye. Given the rate of Disappearance of a dye was
monitored Spectrophotometrically at the visible maximum absorption wavelength. It was Found that the rate of Decolorization
rises by increasing the dosage of Initial H2O2 up to a '' Critical '' Value at which it is maximum and Beyond
which it is Inhibited. A simple reactions pathway, describing adequately the process, has been studied. Based on this
schema Reaction, we have established a mathematical relation between the apparent rate of the dye Constant Removal
and Applied H2O2 dosage Presented by the ratio of its Initial mass concentration to that of the dye. The rate Constant
values ​​obtained by the Model for Three are in good dye Solutions Agreement with the Experimental Data. The Model
Parameters have been determined.