Application of Sonocatalyst and Sonophotocatalyst for Degradation of Acid Red 14 in Aqueous Environment

Background & Aims of the Study: Azo dyes are employed in industrial processes such astextile industry to create large quantities of colored sewages that have organic and nonorganicmaterials. So, remediation of them is essential. In this project, degradation andmineralization of Acid red 14 (AR14) that is a mono Azo dye and widely used in the textileindustries was investigated by Sonocatalysis and Sono photo catalyst in the presence ofhomogeneous (Fe3+) photo catalyst.Materials & Methods: This study is an experimental investigation on a laboratory scale.The study performed on synthetic wastewater that hold Acid red 14.The influence ofoperational parameters such as initial dye concentration and ultrasonic power on thesonochemical degradation was also studied. The optimization of variables was done by onefactor at a time method.Results: The efficiency of the Sonophotocatalytic process with Fe3+ was higher thanSonocatalysis and photo catalyst processes alone. The combination of sonolysis, Fe3+ andphoto catalyst caused a highly synergistic effect and the synergy index obtained for Fe3+Sono photo catalysis was 2.05. Chemical oxygen demand (COD) analysis was used tostudy the degree of mineralization. After 180 min of reaction, the removal of COD was 15,25.4 and 55.5% for UV/Fe3+, US/Fe3+ and UV/US/Fe3+ process, respectively. Thedegradation by photocatalysis and sonolysis followed pseudo first-order with respect to theconcentration of AR14.Conclusions: The results showed that the Sono photo catalytic degradation andmineralization of AR14 in the presence of Fe3+ was synergistic, most likely because of theparticipation of Sono-Fenton and photo-Fenton reactions.

کلیدواژه ها:

Chemical oxygen demand(COD) ، Sonophotocatalyst processSonocatalystUltrasonic powerAcid red 14Iran