Study of Photooxidative Degradation of Reactive Dyes from Aqueous Solutions by UV/ C102 Process

Abstract

The color removal of three reactive dyes in an aquatic system without prior<br />treatment was studied. Selected commercial dyes were treated with NaC102 and<br />UV as oxidation agents. Effects of nature of oxidant, temperature, pH of<br />solutions, concentration of C107—, contact time of C102— and UV irradiation were<br />investigated. Optimal C102— concentration for color removal in the absence of UV<br />irradiation was found to be 20 mg I for all dyes studied. Combination of UV<br />irradiation and C102— was found to be more effective. C102— dosage between 20<br />mg I and UV irradiation (15 watts) for color removal than individual oxidant<br />with contact time of 30 minutes was required. The accuracy of method was<br />checked by measuring the COD of the samples. For determination of color<br />removal of samples, Spectrophotometery method was used for measurement of<br />absorbance changes of the samples (AA).