LAUSR

This work investigates the degradation mechanism of Acid Red 17 dye (AR-17) using HPLC-MS/MS as well as it studies the feasibility of applying ozone and ultraviolet to detoxify the wastewater containing AR-17 dye. Different parameters such as pH, initial dye concentration and treatment time were evaluated to obtain the optimal degradation conditions. The initial dye concentration and solution pH were the parameters which affected the color removal and the maximum decolorization was obtained at pH 11. A 100% color removal took place after 25 min of O3/UV treatment (for 100 ppm dye concentration). Kinetic analyses of AR-17 dye removal followed the pseudo-first-order kinetics. When ultraviolet (UV) was applied with ozone simultaneously, the first-order rate constant (kdx[O3]l) increased and the time of dye decolorization shortened to 5.5 min for 500 ppm dye concentration. GC-MS and HPLC-MS/MS studies of pre-treated dye solution which were performed during and at the end of the pre-treatment time, showed complete degradation of the AR-17 dye. The obtained results also demonstrated that the UV-ozone treatment process decreased the zooplankton toxicity of the treated AR-17 dye wastewater.