Photocatalytic degradation of Acid Red 283 in aqueous solution by UV/ZnO process

In this research, the photo catalytic degradation of Acid Red 283(AR283) has been investigated by the UV/ZnO process in a batch photo reactor. The experiments revealed that the ZnO nano catalyst and UV light had a slight influence when they were used separately.The impact of various factors such as initial pH, the initial dosage of dye and catalyst on the rate of reaction has been investigated. The degradation and mineralization of AR 283 were calculated by HPLC and COD tests. In optimum conditions (0.3 g/L of catalyst, pH at 8 and initial concentration of AR283 at 25 mg/l), 99.5% of AR283 were degraded and 58.5% of COD removed in 60 and 120 min of reaction, respectively. The kinetics of the removal of AR283 can be explained in terms of the Langmuir–Hinshelwood model and the pseudo-first-order kinetics and the apparent rate constant (

Keywords:

UV/ZnO process , mineralization , Langmuir-Hinshelwood , Batch photo reactor , Acid Red 283