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Dyes and pigments used in industries for applications such as textiles, leathers, papers, foodstuffs, additives, etc (1,2). In spectrophotometric methods of PAR reagent as a ligand are used to formation a complex with toxic metals (3,4). Zinc oxide is a semiconductor having many applications, such as being photocatalyst and transparent conductor (5,6). The degradation of dye wastewaters in aqueous solution with heterogeneous semiconductor such as ZnO catalyst was studied by many investigators (7-9). The techniques for the synthesis of ZnO powder including chemical deposition (10), sol-gel process (11), chemical vapor decomposition (12), hydrothermal method (13,14) and precipitation method. In this study, of precipitation method for synthesis ZnO was used with simple, fast, low cost process. The UV/ZnO process is due to the well-known electron promotion from the valance band to the A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: Jun 5, 2018 Received in revised form: Feb 20, 2019 Accepted: Feb 28, 2019 Available Online: Marc 14, 2019 Background & Aims of the Study: In this study, 4-(2-pyridylazo) resorcinol (PAR) as model azo dye was used. In spectroscopic measurements and studies of PAR reagent as a ligand are used to formation a complex with toxic metals. So, removal and degradation these compounds of wastewaters are necessary. The aim of this study is the degradation of PAR from aqueous solutions in circulating fludized bed photo reactor (CFBPR) using ZnO powder. The UV/O2 system was used for dye degradation. Materials & Methods: ZnO powder used a catalyst for the degradation of dye in aqueous solution. ZnO powder has been characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR). The effect of operational parameters such as: pH, catalyst dosage and temperature were studied. The effect of UV irradiation, UV/O2 and UV/O2/ZnO on photocatalytic degradation of PAR were studied. The reaction kinetic was studied. The optimum conditions were determined using design of experimental based one factor at the time (OFAT) method. Results: The optimum conditions for this reaction were obtained at pH=10, catalyst dosage=20 mg/L, and temperature=40°C. The pseudo first order reaction with rate constant (k=0.0105 min) in T=40°C was observed for the photocatalytic degradation of PAR. Activation energy (Ea) for the degradation of PAR was obtained as 48.12 (kJ/mol). These experiments demonstrated that UV/O2 and ZnO catalyst were needed for the effective degradation of dye. Conclusions: The results showed that the photocatalytic process can be suitable to degradation PAR dye from aqueous solutions using ZnO catalyst.

Study Degradation of 4-(2-Pyridylazo)Resorcinol Dye in Circulating Fludized Bed Photo Reactor Using ZnO Nanoparticles