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The photocatalytic decolorization of Remazol Red RR, a commercial azo reactive textile dye, in ZnO suspension, has been investigated in a quartz batch reactor with the use of artificial light source (UV-C). The reaction kinetics are modeled by pseudo-first-order rate law. Regression analysis related pseudo-first-order rate constant, k, to the catalyst loading, empirically as k ∝ [ZnO] 0.6 . The decolorization rate increases with increasing pH, attaining maximum value at pH 10. The rate constant is inversely related to the initial dye concentration, empirically according to the relation k ∝ [C 0 ] -1.5 . Finally, the rate constant is found proportional to the square root of the light intensity as k ∝ [I] 0.5 . These empirical models are therefore combined as k ∝ [ZnO] 0.6 [C 0 ] -1.5 [I] 0.5

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