journal of kerbala university

Abstract

In this work, the photocatalytic decolorization of dispersive blue 26 dye solution was performed in suspension solution of the commercial ZnO, under the artificial light (high pressure mercury lamp) type 250 Watt as UV A source. The photoreaction of this dye was obeyed to pseudo-first order kinetics. The optimum conditions for the photocatalytic decoloration of this dye were determined such as the optimum concentration of dye that equal to 50 ppm, the best dose of ZnO is 300 mg/100 mL, and the maximum value at the initial pH of an aqueous solution is 7.45. Moreover, the apparent activation energy is equal to 22.116 kJ/mol. From other the hand, the some thermodynamics parameters were calculated and ΔH# = 19.591 kJ/mol, ΔS# = 0.201 kJ/mol and ΔG# = -43.043 kJ/mol. There data clear due to the reaction is fast, endothermic and spontaneous reaction.